Keith (M) Posted January 21, 2016 Share #1 Posted January 21, 2016 Advertisement (gone after registration) There is a new Kickstarter project by ExperimentalOptics for a 50mm f/0.75 lens for Leica M cameras EVF essential I should imagine! Link to post Share on other sites More sharing options...
Advertisement Posted January 21, 2016 Posted January 21, 2016 Hi Keith (M), Take a look here Experimental Optics 50mm f/0.75 M Lens on Kickstarter. I'm sure you'll find what you were looking for!
pgk Posted January 21, 2016 Share #2 Posted January 21, 2016 This lens was designed for Radiography originally. I assume its performance will be rather lower than lenses built for conventional photography and it has no aperture. I've seen a few for sale and the quoted price for one in a newly built RF mount seems pretty high given what it is. Link to post Share on other sites More sharing options...
jaques Posted January 23, 2016 Share #3 Posted January 23, 2016 man the depth of field at f1 is hard enough to work with as is- at f.75 I imagine it would be next to useless for most subjects. And it is ugly too. I like the way in their blurb they optimistically say, "the lens is not RF coupled: so it is perfect for your live-view camera'. Link to post Share on other sites More sharing options...
pico Posted January 23, 2016 Share #4 Posted January 23, 2016 Yes, they were designed for x-ray photography and are crap for any general work. The reason they are plentiful enough for the over-hyped campaign is that they can hardly give them away now. . Link to post Share on other sites More sharing options...
jaapv Posted January 23, 2016 Share #5 Posted January 23, 2016 Well, it could be a kind of Thambar replacement, were it not that it won't focus far beyond one meter, making the helicoid adapter rather pointless. Link to post Share on other sites More sharing options...
luigi bertolotti Posted January 24, 2016 Share #6 Posted January 24, 2016 The noble brand is intriguing... the practical usage on a M is highly questionable... Link to post Share on other sites More sharing options...
Herr Barnack Posted January 26, 2016 Share #7 Posted January 26, 2016 Advertisement (gone after registration) It seems that at f/0.75, the DOF would be so thin that using a tripod would be mandatory in order to nail your focus... Link to post Share on other sites More sharing options...
wattsy Posted January 26, 2016 Share #8 Posted January 26, 2016 This lens was designed for Radiography originally. Yes, they were designed for x-ray photography and are crap for any general work. The sellers of this lens claim that it isn't derived from an x-ray lens: "We're aware that there are some weird pictures out there on the internet, taken with some weird f/0.75 lenses. There's indeed a handful of - completely unrelated - f/0.75 lenses, some of which we too came across through the years, designed mostly for x-raying. Thus, their photographic performance is very poor and they can indeed be bought for 100 Euros or so second hand." That said, it still looks like a crap lens. For €2,500 you get sub-Jupiter quality with the added convenience of a restricted 1-2m focussing range and no adjustable aperture. Truly a lens for the age. Link to post Share on other sites More sharing options...
pgk Posted January 26, 2016 Share #9 Posted January 26, 2016 The sellers of this lens claim that it isn't derived from an x-ray lens: "We're aware that there are some weird pictures out there on the internet, taken with some weird f/0.75 lenses. There's indeed a handful of - completely unrelated - f/0.75 lenses, some of which we too came across through the years, designed mostly for x-raying. Thus, their photographic performance is very poor and they can indeed be bought for 100 Euros or so second hand." Funny name on the lens shown then Rayxar - which is clearly a name associated with XRays - 'Ray-X-ar' - don't you think? I would actually suggest that any lens with this name which actually wasn't an Xray lens would be pretty weird. Link to post Share on other sites More sharing options...
wattsy Posted January 26, 2016 Share #10 Posted January 26, 2016 Funny name on the lens shown then Rayxar - which is clearly a name associated with XRays - 'Ray-X-ar' - don't you think? I would actually suggest that any lens with this name which actually wasn't an Xray lens would be pretty weird. I'm sure you are right, I'm just quoting what the sellers have to say about it. I quite like the name Rayxar – has a kind of 1950s Forbidden Planet feel about it. Still, I can honestly say that I wouldn't want this lens even if it was being offered for free. Link to post Share on other sites More sharing options...
NickR Posted January 27, 2016 Share #11 Posted January 27, 2016 X-ray lens? For X-rays, glass has a refractive index of 1. How could you make a lens out of it? Link to post Share on other sites More sharing options...
jaapv Posted January 27, 2016 Share #12 Posted January 27, 2016 Look up polycapillary optics. However, I am guessing older lenses use optical glass that is composed with heavy metals, like lead. Link to post Share on other sites More sharing options...
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