jamgolf Posted March 13, 2017 Share #1 Posted March 13, 2017 Advertisement (gone after registration) Hello Does anyone know image circle size of 280/4? Specifically will is the image circle large enough to cover a 54x40 sensor? In general is there a document/resource that lists Leica R lens image circles? Thank you very much ! Link to post Share on other sites More sharing options...
Advertisement Posted March 13, 2017 Posted March 13, 2017 Hi jamgolf, Take a look here 280/4 Image Circle. I'm sure you'll find what you were looking for!
jip Posted March 13, 2017 Share #2 Posted March 13, 2017 It is big enough for the Leica S sensor which is 45x30 Link to post Share on other sites More sharing options...
jamgolf Posted March 13, 2017 Author Share #3 Posted March 13, 2017 It is big enough for the Leica S sensor which is 45x30 That is certainly good to know that it can cover 45x30. Hopefully someone knows whether it is can cover 54x40. Link to post Share on other sites More sharing options...
a.noctilux Posted March 13, 2017 Share #4 Posted March 13, 2017 Quick check with my Apo-Telyt-R 4/280, the answer is no for 67mm of circle (circa 54x40). It covers only around 60mm circle depending on focus distance and aperture. Link to post Share on other sites More sharing options...
topoxforddoc Posted March 13, 2017 Share #5 Posted March 13, 2017 The 280/4 works fine with the 1.4x APO on my S(006). That way, it focusses to infinity without adjustment. The 280-/4 on the S will focus to about 15-20m only w/o the 1.4 x APO. Link to post Share on other sites More sharing options...
jamgolf Posted March 14, 2017 Author Share #6 Posted March 14, 2017 Quick check with my Apo-Telyt-R 4/280, the answer is no for 67mm of circle (circa 54x40). It covers only around 60mm circle depending on focus distance and aperture. Thanks for your input. How did you determine that image circle is 60mm? You said quick check, so I am curious if there is a technique. I have an Apo-Elmarit-R 180/2.8 and it covers 54x40 so I was hoping 280/4 would cover as well. Link to post Share on other sites More sharing options...
jamgolf Posted March 14, 2017 Author Share #7 Posted March 14, 2017 Advertisement (gone after registration) The 280/4 works fine with the 1.4x APO on my S(006). That way, it focusses to infinity without adjustment. The 280-/4 on the S will focus to about 15-20m only w/o the 1.4 x APO. If 280/4 covers 45x30 with a 1.4X extender, then it might cover 54x40 sensor. If a 1.4X extender reduces the image circle by a factor of 1.4x then its absence would increase it by that factor. Might that mean it would cover 63x42? i.e. [45x1.4 x 30x1.4] I am not sure ... Link to post Share on other sites More sharing options...
fernando_b Posted March 14, 2017 Share #8 Posted March 14, 2017 If 280/4 covers 45x30 with a 1.4X extender, then it might cover 54x40 sensor. If a 1.4X extender reduces the image circle by a factor of 1.4x then its absence would increase it by that factor. Might that mean it would cover 63x42? i.e. [45x1.4 x 30x1.4] I am not sure ... I'm not sure about this. The -X (2 or 1.4) extender should take the central part of the original image and should enlarge it, regardless the size of the original image circle. Fernando. Link to post Share on other sites More sharing options...
John McMaster Posted March 14, 2017 Share #9 Posted March 14, 2017 If 280/4 covers 45x30 with a 1.4X extender, then it might cover 54x40 sensor. The 280/4 on its own covers the 45x30 sensor, the 1.4x is needed to focus to infinity. The 80/1.4 covers the S sensor but there is a large difference between 45x30 and 54x40 for a lens designed to cover 36x24 ;-) john Link to post Share on other sites More sharing options...
jamgolf Posted March 14, 2017 Author Share #10 Posted March 14, 2017 John, Fernando Thanks for your replies. You guys are most probably correct. Although, I have an apo-elmarit-r 180/2.8 and it does cover 54x40 sensor. Just barely but it does. That makes me wonder about 280/4. It would be quite remarkable if its image circle covered 54x40, since the original design was meant to cover only 36x24. Link to post Share on other sites More sharing options...
a.noctilux Posted March 14, 2017 Share #11 Posted March 14, 2017 Thanks for your input. How did you determine that image circle is 60mm? You said quick check, so I am curious if there is a technique. I have an Apo-Elmarit-R 180/2.8 and it covers 54x40 so I was hoping 280/4 would cover as well. My quick technic is to have (some time ago) lenses that cover 24 x 65 for my Xpan with long focus or shift-WA lenses of other brands. I use a large plastic hood and stick at one end "opaline paper" to simulate the film plane and I draw brackets of 24mm and 65mm on. To be used with a lens, just apply the other end of the hood to the back of lens then "read" (with possibility of focus and aperture variable), on the opaline the circle of coverture. Aim at a lamp, in focus or not, it's easy to see the circle. When I used this with 4/280 yesterday, the circle has only about 60mm, that's all. Far from +67mm required. Link to post Share on other sites More sharing options...
jamgolf Posted March 14, 2017 Author Share #12 Posted March 14, 2017 My quick technic is to have (some time ago) lenses that cover 24 x 65 for my Xpan with long focus or shift-WA lenses of other brands. I use a large plastic hood and stick at one end "opaline paper" to simulate the film plane and I draw brackets of 24mm and 65mm on. To be used with a lens, just apply the other end of the hood to the back of lens then "read" (with possibility of focus and aperture variable), on the opaline the circle of coverture. Aim at a lamp, in focus or not, it's easy to see the circle. When I used this with 4/280 yesterday, the circle has only about 60mm, that's all. Far from +67mm required. Thanks. I did not know that. Although that makes me sad that I can't use the 280/4 Link to post Share on other sites More sharing options...
jip Posted March 16, 2017 Share #13 Posted March 16, 2017 The 280/4 on its own covers the 45x30 sensor, the 1.4x is needed to focus to infinity. The 80/1.4 covers the S sensor but there is a large difference between 45x30 and 54x40 for a lens designed to cover 36x24 ;-) john I wish I could use the 80mm Summilux on my S, I have the lens... It would be great for soft dreamy portraits! But there is no way to make it focus a bit further... I'd be okay with 5 meters being the limit for portraits with the 80mm... but it's only 1-2 meters I believe ;( Link to post Share on other sites More sharing options...
jamgolf Posted March 21, 2017 Author Share #14 Posted March 21, 2017 I got a chance to test Leica R 280/4 with a 54x40 digital back: Image quality is fantastic but sadly the image circle is not large enough to cover 54x40 sensor. It would easily cover 44x33 and would be an incredible match for Fuji GFX or any other 44x33 sensor. Full frame, zero post processing, @ f11: 100% crop: Its amazing how these Leica R lenses, originally designed for 36x24 cover 44x33 (some even cover 54x40) and hold their superb image quality into the corners. Thanks to all those who contributed to this thread. Link to post Share on other sites More sharing options...
mmx_2 Posted March 21, 2017 Share #15 Posted March 21, 2017 I wish I could use the 80mm Summilux on my S, I have the lens... It would be great for soft dreamy portraits! But there is no way to make it focus a bit further... I'd be okay with 5 meters being the limit for portraits with the 80mm... but it's only 1-2 meters I believe ;( Wouldn't it possible to modify the mount a bit? I will do some investigation on my R-glasses Link to post Share on other sites More sharing options...
mmx_2 Posted March 21, 2017 Share #16 Posted March 21, 2017 I got a chance to test Leica R 280/4 with a 54x40 digital back: Image quality is fantastic but sadly the image circle is not large enough to cover 54x40 sensor. It would easily cover 44x33 and would be an incredible match for Fuji GFX or any other 44x33 sensor. Full frame, zero post processing, @ f11: 100% crop: Its amazing how these Leica R lenses, originally designed for 36x24 cover 44x33 (some even cover 54x40) and hold their superb image quality into the corners. Thanks to all those who contributed to this thread. Which back is this? THanks for your test also ! Link to post Share on other sites More sharing options...
jamgolf Posted March 21, 2017 Author Share #17 Posted March 21, 2017 Which back is this? THanks for your test also ! IQ3-100 Link to post Share on other sites More sharing options...
jip Posted April 7, 2017 Share #18 Posted April 7, 2017 Wouldn't it possible to modify the mount a bit? I will do some investigation on my R-glasses If that would possible I would do it immediately! I'd be okay with someone 'destroying' my 80 1.4 if it would fit my S afterwards! Link to post Share on other sites More sharing options...
clmusic Posted April 8, 2017 Share #19 Posted April 8, 2017 If that would possible I would do it immediately! I'd be okay with someone 'destroying' my 80 1.4 if it would fit my S afterwards! Did you try this? http://www.lei-ko.de/produkte/Produkte.html Link to post Share on other sites More sharing options...
jip Posted April 10, 2017 Share #20 Posted April 10, 2017 Did you try this? http://www.lei-ko.de/produkte/Produkte.html Yes but it won't focus further than 1.5 meter. Link to post Share on other sites More sharing options...
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