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Canon FD 35mm f2 thorium

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Riesige Auswahl an Elektronik-Produkten. Kostenlose Lieferung möglic Kaufen Sie Canon 35mm bei Europas größtem Technik-Onlineshop Canon FD 35mm f2 with concave front element. Lens known as radioactive, due to the usage of rare earth element Thorium or Lanthium. Lens is visible yellow, and this can be cured by exposing it to the UV light, but I don't want to, as it makes nice yellow filter for BW Canon FD 35mm f/2. A very robust all metal wide angle with a thorium element. Unlike the later New FD line this is a robust beast of a lens. It's all metal complete with gorgeous brass hidden inexplicably under black enamel. The design decisions from this period blow my mind. Also uniquely the lens features a concave front element making it. Canon FD 35mm f2 concave thorium Aug 21, 2017 Been hearing that this lens is wonderful. Looking to use on Fuji mirrorless as 50mm equivalent. Is the radioactivity a real issue? Thoughts, recommendations, other all appreciated, thanks. -- hide signature --Blog: www.photofix101.com.

The FD 35mm f2 concave Thorium lens was an L lens before Canon invented them, mine is forty years old and it's such a good lens they'll have to prise it out of my cold dead hands. , Jun 6, 2011 # Canon FD 35mm f/2. The Canon FD 35mm f/2.0 lens was manufactured by Canon for the FD lens mount. It was sold in a number of variations over the years, and was the fastest Canon lens in the 35mm focal length before the debut of the EF 35mm f1.4

There are at least six different 35mm lenses for Canon FD: Canon FD 35mm f/2.0 S.S.C. Optical Design I: Uses radioactive thoriated elements and has a concave front element. Serial Number 10001-99999. Canon FD 35mm f/2.0 S.S.C. Optical Design II: Doesn't use thoriated elements, convex front element, Serial number >100000 akortrey: I recently picked up a 35mm chrome nose f/2 (the one with the thorium). Since the lens is mildly radioactive, what effect would that have on fogging film? Particularly high-speed film. Is there a time limit for how long the lens can be attached to the camera before it affects 1600 or higher film? Or is the radiation a negligible amount Why is Thorium used in Canon FD 35mm F2 lenses? Thorium, a radioactive rare earth element, was added to the bulk glass to make the lenses for the Canon FD 35mm lenses. Thorium enhances the refractive indices of the lens and thereby increases the speed light passes through. This allowed manufacturers to make thinner and higher quality lenses

Canon 35mm bei Conrad - Bequem auf Rechnung einkaufe

Canon FD 35mm f/2 Concave (Thorium) Verybiglobo phot

  1. I have the 35mm f2.0 CN as well as the 35mm f2.0 nFD if you can shoot better then the nFD lens your one heck of a photographer. It is as Sharp as any of the Canon primes save a couple of the 50mm's. awahlster, Feb 22, 2007. #1. I have the 35/2 FD SSC with the tint and a 35/2 New FD
  2. Canon FD 35mm F3.5 S.C. on my EOS R @ F3.5 This was lens that had not been on my radar until very recently. I have owned the FD 35mm F2 S.S.C. (both the radioactive thorium concave & non-radioactive convex front-element versions) since I started my FD lens obsession years ago
  3. Lens: Canon FD 35mm F2 Concave Thorium. Zwetschgenblüten by Victoria Scheler Eckstein 16 Plum blossom. Pancolar 1.8/50 aus Jena. Blue Stars by michel1276 82 7 Pancolar 1,8/50 Thorium Lens. Summer Song by Victoria Scheler Eckstein 18 2 Englische Rose mit Pancolar 1.8/50 aus Jena (Thorium).
  4. I have the Canon FD 35mm f2 Thorium lens, and it's such a great lens I'll take the risk, and wear lead lined boxer shorts. Ben. Nov 23, 2009 #4. MikeSeb Member. Messages: 1,104. Joined: Jun 12, 2005 Location: Denver, CO Shooter: Medium Format

Stephen Daugherty Photography - Canon FD 35mm f/

Gamma rays, of course, are ionizing radiation and are capable of causing genetic mutations and/or triggering cancers. While the increased danger posed by use of Thorium-containing lenses may be relatively small, it is certainly there. The only one I'm aware of, is the version of the 35mm f/2.0 that has a concave front element Canon FD 17mm f/4. Canon FD 35mm f/2.0 (versions from the early 1970's - concave front element) Super Takumar 35mm f/2.0. SMC Takumar 50mm f/1.4. Super Takumar 50mm f/1.4 (the latest version with 7 elements - red 'infrared mark' being on the left side of DoF scale '4') If thorium doped lenses are stored for prolonged periods of time.

Canon FD 35mm f2 concave thorium: Adapted Lens Talk Forum

  1. Details about Canon FD 35mm f2 SSC, Concave Silver Breach Lock, Thorium Glass See original listing Canon FD 35mm f2 SSC, Concave Silver Breach Lock, Thorium Glas
  2. A legendary Canon FD 35mm f2 Thorium lens attached to a Canon EF body all for £90, I thought at the time the price on the ticket in the shop was just for the lens, which was much cheaper than the market price at the time, but it was for the whole shooting match, so I made them an offer of £70 that they eventually accepted
  3. Find many great new & used options and get the best deals for Canon FD 35mm f2 SSC, Concave Silver Breach Lock, Thorium Glass at the best online prices at eBay! Free shipping for many products
  4. Here you can read B&H/Canon Lens. This should not affect image making. Body is clean. Focus is smoooooth and steady. Numbers are clear. Great sharp lens for use or to complete your collection
  5. I'd prefer a small MF prime. I can live with a touch of softness wide open - the Canon FD 35mm f/2 S.S.C (concave thorium) or Canon FDn 35mm f/2 are fine in this respect - but a strong SA glow would be a turn off. Edit: the CV 35/1.7 is probably the runner up. The CV 35/1.4 and 40/1.4 aren't bad wide open, but the tiny size of the central sweet.

I was using the FD 35mm f/2 SSC (concave thorium) and liked the performance, but not the size and weight. When the opportunity to get the FDn came up, I went for it. The FDn is ahead in in terms of sharpness per aperture and the bokeh is a bit nicer in my opinion. rnrnUnlike some, I welcome the plastic build, if only because it saves weight Canon 35mm f/2 SSC Breech Lock FD-Mount Lens, Early {55} (Thorium Glass with Concave Front Element) Canon 35mm f/2 SSC Breech Lock FD-Mount Lens, Early {55} (Thorium Glass with Concave Front Element) Keh Model# 385689 . Compare Model Add to Wish List. Share. $0.00. Skip to the end of the images gallery

Which Canon FD 35 f2? Photo

  1. There are at least six different 35mm lenses for Canon FD: Canon FD 35mm f/2.0 S.S.C. Optical Design I: Uses radioactive thoriated elements and has a concave front element. Serial Number 10001-99999. Canon FD 35mm f/2.0 S.S.C. Optical Design II: Doesn't use thoriated elements, convex front element, Serial number >100000
  2. imum aperture of F/16 (which was later upped to F/22), and S.S.C written on the front. The later versions of the 35 F2 are said to have slightly dropped in quality. I've used this one for a while now with the Canon A-1 and the results are just so damn sharp, even at.
  3. I recently got a Canon FD 35mm f/2 SSC II (concave, thorium, f16). At least in terms of sharpness across the frame on my A7, it's definitely behind your FDn. The corners and edges are very nice at f/8, usable at f/5.6, and pretty mushy below that. Definitely not bad though, considering it's age
  4. Carl Zeiss Planar T* 35mm f/2 (Contax G) Canon FD 35mm f2 (Thorium) A.Schacht Ulm Travegon 35mm f3.5 R Voigtlander Nokton Aspherical 35mm f/1.2 II . To help this page survive, your donation will be highly appreciated. Share. Tags: Canon FDn 35mm f/2 Sony NEX 7
  5. Why is Thorium used in Canon FD 35mm F2 lenses? Thorium, a radioactive rare earth element, was added to the bulk glass to make the lenses for the Canon FD 35mm lenses. Thorium enhances the refractive indices of the lens and thereby increases the speed light passes through. This allowed manufacturers to make thinner and higher quality lenses
  6. A radioactive Canon FD 55mm f/1.2 lens The real threat comes from thorium eye pieces, which are much more rare but would be very close to a very sensitive area
  7. Canon FD 35mm f/2.0 (versions from the early 1970's, concave) Canon FD 55mm f/1.2 S.S.C. Aspherical (Measured at 46532 CPM @ front element ) Canon SUPER-CANOMATIC LENS R 50mm 1:1.8 No.78xx

The Canon new FD 35mm 1:2.8 usually sells for around $35-60 at ebay.com (affiliate link). In Germany you can buy it for 40-70€ at Amazon.de (affiliate link). If this review was helpful to you, please consider using one of my affiliate links It actually holds its own against the thorium coated 35mm f/2.0, which I also tested. It is just slightly less sharp - just barely perceptible. The downside vs. that lens is that it is slower and harder to focus in low light. The upside is that it's tiny and almost too light to feel on your camera. It also flares less than the f/2.0 The concave Canon FD 35mm f2 has a unique drawback: its lens coatings contain radioactive Thorium. While it's not likely a health hazard, the lens elements tend to turn yellow over time, particularly if the lens is covered and stored for long periods. This makes them excellent choices for black & white photography and problematic for video Canon FD 35mm f/2 breech mount, concave front element version, pre-S.S.C. with chrome snout Canon EF with mirror and diaphragm prefire Vignetting = C @ f/2, B @ f/2.8, A- @ f/4, A thereafter Distortion = barrel Aperture Center Corner f/2 A- B f/2.8 A B+ f/4 A A f/5.6 A+ A+ f/8 A A+ f/11 A A+ f/16 A A Note: Incorporates radioactive, thorium floride (rare earth) glass which imparts a warm.

marty wrote: Postponing that none of them will focus to infinity on Eos bodies (without surgery or corrective element in the adapter) the Canon nFD 35 2 is a good performer, sharp even wide open (if you manage to focus perfectly). This is true on film at least, where I use it. Cheers, M. _____ Canon FD Bodies: AT-1, A-1, T-90 Lenses: nFD 20mm f2.8, 24 f2.8, 28 f2.8, 35 f2, FD 50 f1.8 S.C., 85. The Canon FD 35mm f/2 SSC (concave thorium) is big, but not all that big. Similar in size and weight to a lot of the 50mm f/1.4 lenses during the same era. I personally prefer my Canon FDn 35mm f/2 (smaller, lighter, sharper wide open, better bokeh), but the SSC concave thorium is very nice, especially for the era Product Information. The lens construction of 9 elements in 8 groups in the Canon FD SSC camera lens ensures you get superior picture quality. With a minimum aperture of f/16, this Canon 35 mm lens gives still images of moving objects. The closest focusing distance of 0.3 m in this Canon camera lens offers you the minutest details of your objects Categories News Tags canon fd f2 35mm 2.4 lenses zeiss lens colour flektogon 35 warm macro wide m42 jena lens gh1 5d mark ii radioactive thorium Post navigation Anamorphic Widescreen - Panasonic GH1 with LA7200 Lens - Part

1. Canon FD 35mm f2.0 S.S.C II. Released in April 1976 this is the second incarnation of the the original breech lock design and the last before the new FD series. It has a convex front element as opposed to the concave front element of the first version. The radioactive thorium element from the first version is also missing Sony SEL 35mm f/1.8 OSS Carl Zeiss Planar T* 35mm f/2 (Contax G) Canon FDn 35mm f/2 Canon FD 35mm f/2 Thorium A.Schacht Ulm Travegon 35mm f3.5 R Voigtlander Nokton Aspherical 35mm f/1.2 II . To help this page survive, your donation will be highly appreciated Canon FD 35mm f2.0 SSC -- First Day Out. Church -- NEX-5N & Canon FD 35mm f2.0. Click for larger. Today is sort of a perfect day for photographs -- overcast sky after a light misty rain and the greens are very green and colours seem to jump out at you. I was eager to try out the FD 35mm f2 that I bought from the camera show yesterday One of my favorite lenses to adapt is Canon's FD 35mm f/2 SSC, which was made from March 1973 through April 1976. It features a concave front element, but what makes this lens truly unique is its design utilizes radioactive thorium elements to increase the refractive index while maintaining low dispersion

f) You usually use 35mm for party shots in low light. Links to other tests with 35mm lenses: Sony SEL 35mm f/1.8 OSS E Canon FDn 35mm f/2 Canon FD 35mm f/2 (Thorium) A.Schacht Ulm Travegon 35mm f3.5 R Voigtlander Nokton Aspherical 35mm f/1.2 II . To help this page survive, your donation will be highly appreciated My eldest son is a nuclear physicist who works at at a leading U.K nuclear facility and he tells me there is more radiation than I'm getting from my Canon FD Thorium lens coming from the granite work surfaces in our kitchen and it doest represent 1/10th of the annual radiation dosage that workers in his industry are allowed safely to absorb. Given that an f/2 lens most probably becomes really useable from f/2.8 onwards, you might want to check out f/2.8 lenses because they're generally much cheaper. From my experience the Minolta MD (not MC indeed) 2.8/35 can be quite good wide-open, if you happen to stumble on a good sample, and the Olympus OM Zuiko and Canon FD 2.8/35mm have a.

Canon FD 35mm f/2 - Wikipedi

Canon FL 58mm f / 1.2 Canon FD 35mm f / 2.0 (versions from the early 1970's) Canon FD 55mm f / 1.2 SSC Aspherical Carl Zeiss Jena Pancolar 55mm f1.4 (measured at 2360 nSv / h) Carl Zeiss Jena Pancolar 50mm f1.8 Zebra Carl Zeiss Jena Biometar 80mm f2.8 Zebra (Only P6 mount version The only Canon lenses as far as I know that used Thorium Salts added to the glass in the manufacturing process this was not a coating but added to make the glass low dispersion, were the 35mm f2 the one with the concave front element, the 55mm 1.2 AL, 55mm 1.2 SSC AL, 55mm1.2 SSC Aspheric , and the FL 58mm 1.

FD The lens is designed for Canon 35mm film SLR cameras with Canon FD mount. $2,450. Canon FD 35mm TS lens allows that at a fraction of a cost compared to the more expensive Canon FE TS ii series of lenses. [ Exc+5 ] Canon New FD NFD 35mm f/2 Wide Angle MF Lens From Japan #282. Canon Lens FD 35mm f/2 S.S.C. Mouse over to Zoom-Click to enlarge: X RedStan custom rear (55mm) and front filter (72mm) clamps by redstan.com. Canon FD 24mm F/2.0. Canon FD 35mm F/2.0 (Thorium Concave version) Canon 50mm F/1.4. Canon 85mm F/1.8. Pelican Storm Case. Canon FD to EOS Fotodiox adapter. Canon FD to Micro 4/3 adapter. Focus gears for each Canon lens by followfocusgears.com

Only in 1975 Minolta (and Canon) made an even faster 2/28mm. To reduce spherical aberrations and CAs t he Minolta MC 2.5/28mm uses radioactive glass (as well as the first FD 2/35mm from Canon). The radioactive thorium glass causes a pronounced yellow color cast which can be cured by UV light FD 35mm f/2.0: the one with concave front element is the famous lens made by slightly radioactive Thorium containing glass. It is allegedly one of the sharpest Canon FD lenses ever made. I can't confirm any of its excellent reputation- maybe I own a lemon sample but mine is just an average lens by all means, nothing special about it

Canon FDn 20mm f/2.8 on Sony A7 : ERPhotoReview Unfortunately I cannot find the same test for the 17mm F4 so I am left wondering how it will compare. My SEL16F28 with the ultra wide adapter was giving me focal range of about 18mm (35mm equivalent). Either Canon lens will be used with a Lens Turbo 2 adapter, meaning it will act almost as a FF. Erwin Puts writes about the aspherical FD 55mm 1.2 lens: Some commentators called the Canon FD 1.2 aspherical the best standard lens in the world. It is hard to disagree.. In 1971, when the Noctilux was still being produced and sold, Canon introduces their own version of an 1.2 design with aspherics

Shootout: The Canon FD 35mm lenses - phillipreeve

And interestingly enough, unlike Canon FD lenses the M42 mount Super Takumars are also EOS-friendly. And et's not forget the value proposition. These 50mm Super-Takumars are cheap. It's not hard to find some variant of this lovely Pentax glass for less than the cost of an even more common FD-mount 50mm f/1.8. My eight element lens was free Find helpful customer reviews and review ratings for Fotodiox Pro Adapter, Pentax 67/67II Lens to Canon EOS Camera Mount Adapter -- for Canon EOS 1d,1ds,Mark II, III. The Canon FD 35 mm F/2 S.S.C (I) is a high quality fast wide-angle manual focus prime lens for Canon FD SLR film cameras. This is the first version of the Canon FD 35 mm F/ 2 S.S.C lens. The glass elements of this lens contain thorium, a rare-earth element. Thorium was added to bulk glass to increase a refractive index ( as a rule, a high.

Used Rare CANON FD 35MM F2 CHROME NOSE Lens w/ CAPS

FD 35mm f/2 radioactive lens Canon FD Flick

Distance F 2.8 (edited image) Mechanics. From closest focus to infinity you can turn the focusring about 90°. The Aperture is a bit more rattly and not that smooth as the apertures of the nFD series. My version is the last one of the breech lock 35mm 2.0. These one does have a convex frontelement and does not have any Thorium containing lenses I was glad that he mentioned the yellowing some of the lenses get with thorium elements. I started getting some FD lenses with thrift finds and repairs with clean glass to later rehouse and cinevise at some point and I did pay extra to get a 35mm F2 Concave version that had some yellowing My 35mm legacy options are. Canon FD 35/2 S.S.C.: remarkably good contrast and sharpness wide-open but only in the center; corners improve continuously until very good by f/8. My best legacy 35mm lens. Minolta MD 35/1.8: Veiling flare wide-open, resolution is there in the center. f/2.8 is fine, corners need f/11 10 Canon FD 35mm f/2 breech mount, concave front element version, pre-S.S.C. with chrome snout; 11 Canon FD 35mm f/2 breech mount, S.S.C. convex front element version; 12 Canon FD 35mm f/2 bayonet mount; 13 Canon FD 35mm f/2.8 bayonet mount; 14 Canon FD 35mm f/3.5 pre-S.C. breech mount; 15 Canon FD 35mm f/3.5 S.C. breech moun

Canon FD 35mm f/2 Camera Lenses for sale eBa

Best Canon FD lenses On this page you will find a list of the best prime lenses that have shaped the history of this fascinating photographic system, and also two zoom, the 35-105 f / 3.5-4.5 lens with aspherical (little known because it marketed in 1985, two years before sunset system FD) and [ Oh, I have to highlight this fact, Canon's greatest rival in the professional SLR market, Nikon, had only introduced an equivalent version in 1997 with only an autofocus version (AF Zoom-Nikkor 20-35mm f2.8D, which is a stop brighter than the original FD version by Canon), about 10 long years since Canon introduced their FD 20-35mm f3.5 L On. Other manufacturers like Canon, Konica, Asahi Pentax, and others also used thorium in their lenses made between about 1945 and 1980. Manufacturers mostly used thoriated glass for the fastest, more expensive lenses, such as the f1.2s and f1.4s, but slower radioactive lenses also exist I have two Canon LTM lenses back from when they were making rangefinders. Both are I think from the 60s so they aren't vintage, they are definitely full-on vintage. Canon LTM 135mm f/3.5 Possibly the cheapest lens I ever bought at under 100 poun.. Buy Canon Telephoto Camera Lenses for Canon FD and get the best deals at the lowest prices on eBay! Great Savings & Free Delivery / Collection on many item

Canon FD 35mm f/2 SSC II - Photography Lif

I had a 35mm concave and an nFD 35mm f2. Both were nearly on par with the 35mm Fuji @ f2 as far as sharpness and color. The FD Canons are known for their sharpness at the expense of bokeh. I remember reading a comparison of the 35mm f2 nFD with a Zeiss 35mm f2.8. The Canon held its own with the Zeiss FD 35mm f2.0 with concave front element? From what I understand, this is the sharpest 35mm f2.0 Canon ever made. It was replaced in the breechlock mount with a convex front element lens, which I believe was an S.S.C., and apparently was not very good. Canon redesigned the lens for their new bayonet mounts and is a much better lens than the S.S. Canon T70 is a 35mm manual focus FD mount SLR introduced in 1984. It is one of last manual focus SLRs produced by Canon before it switched to the production of autofocus EF mount EOS SLRs. The Canon T-series replaces the older A-series cameras (AE-1, A-1, etc.) with more advanced features in exposure controls, a stronger metal-blade shutter, a. The 14mm f2.8, 28mm f2, and 35mm f2 are beautiful and impressive lenses in their own right. Wide open the lenses have bokeh character that I really love and that is hard to find in modern lenses. The same goes for the flares. 1970s Canon glass had some wonderful early multi-coatings, that are prone to veiling glare, and deliver flare and ghost. Kodak Aero Ektars (6, 12, and 24) Canon Pellix 50mm lens. Canon FL 58mm f1.2. Canon FD 55mm f/1.2. Micro-Nikkor 200mm f/4. Nikkor 35mm f/1.4 (early variant with thorium glass elements) Leica 35mm f/2 summicron. most Asahi Super Takumar 50mm f/1.4 lenses and SMC versions (but excluding the scarce original 8 element version

Thorium was added to bulk glass to increase a refractive index ( as a rule, a high refractive index causes high dispersion).That allowed manufacturers to make lenses thinner. In the 1970s thorium was replaced with some other safe elements. In due time the Canon FD 35 mm f/ 2 S.S.C used to be Canon's standard-bearer The SSC Thorium 35mm f2 is the most coveted of the 3 variations. I had one of those as well, but did not notice any difference except in color rendition. The thorium had yellowed a bit. X-T30 and Canon FD 100-300 f/5.6 (1st version' push-pull tele zoom) in Fujifilm 1.25X crop-mode - Kitty at 3m - F/5.6 - ISO500 - Speed 1/105s.. This eventually led to its demise in the 1970s with the advent of proprietary bayonet mounts (Pentax K, Nikon AI, Canon FD, etc.). The M42 market has received a recent shot in the arm with the recent Cosina announcement of their release of a new M42 mount camera, the Voigtlander Bessaflex TM (the TM stands for T hread M ount, not TradeMark) Sharpness isn't really a thing. More precisely, we measure resolution at a particular microcontrast level. For example, an MTF50 of 30 would mean one could make-out 30 pairs of alternating black and white lines per mm (on the sensor) with the br.. Lens fungus in Canon EF and EF-S Lenses. Approve the Cookies This website uses cookies to improve your user experience

Thoriated glass Last updated February 25, 2021. Thoriated glass is a glass material used in the manufacture of optical systems, specifically photographic lenses.It is useful to this process due to its high refractive index.Thoriated glass is radioactive due to the inclusion of thorium dioxide, oxide of radioactive element thorium.It has therefore been succeeded as a material of choice by glass. Pentax Spotmatic SP with a 35mm f/2 Super-Takumar lens. With most vendors (Canon or Minolta, for instance), the different generations of lenses are named for their mount (a Canon FL lens has a so called FL mount and works stopped down, while a Canon FD lens has the so called FD mount that enables full aperture metering). No such thing with Pentax Radioactive lenses are due to the use of Thorium as an ingredient for glass elements & coatings used from the 1900's thru the 1970's when its use was halted. Thorium oxide is highly refractive and low dispersion, with a crystalline structural similar to calcium fluorite. Like fluorite, its optical properties of high refractivity and low. Lens Canon 35mm F2 IS USM. 10.000.000₫. 1 gian hàng bán mới, giá từ 10.000.000₫. (3) Em mới mua con này đc 3 tháng, độ nét OK ngay tại khẩu 2. Màu đẹp hơn 85 1.8, ko có j để chê ngoài build đời cũ, lấy nét kêu rẹt rẹt :D. Nếu bác quan tâm khẩu và build thì chơi sigma rồi về chịu.

Stephen Daugherty Photography - Canon New FD 135mm f/3Stephen Daugherty Photography - Canon New FD 50mm f/1Lens Bubbles: Canon FD 35mm f2CANON FD 2

Adorama pays top dollar for your used gear. Canon FD 50mm 1:3.5 Macro (60 - 120€) - Opically the best and cheapest of the set Besides, this version does not use radiothorium.rnrnEarlier on, Canon lenses of this series used thorium, a As this page is copyrighted and formally registered, it is unlawful to make copies, especially in the form of printouts for personal use. This is a tiny bit. I have one lens with thoriated glass, a Canon FD 35/2.0 SSD with concave front element. I get different readings from front and back: Front: 1.0 microsievert/h Back: 1.9 microsievert/h I also tested my uranium glass objects and the most active was a greenish glass bowl that showed 0.8 microsievert/ This seems to be as due to a superior optical design enabled by the inclusion of Thorium dioxide glass with enhanced refractive indices. Canon FD 35mm f/2 - Wikipedia For engineering applications, Schottky defects are important in oxides with Fluorite structure, such as CeO2, cubic ZrO2, UO2, ThO2 and PuO2 Recently acquired a c.1971 vintage Canon FD 35/2 s.s.c lens with the concave front glass element and internal thorium glass element hence has an amber tint which requires neutralising before using for colour images with my SL 601 and Leica T I have the Fotodiox to M4/3 adapter for Canon lenses, and it works perfectly with my ultra-sharp 35mm f2.0 Thorium lens, as does another Canon adapter with my Tamron 90mm f2.5 FD Mount. All Fotodiox adapters that I've seen so far are well-machined and beautifully finished inside and out, I'm not going to let this one spoil my opinion of the.