ddanois Posted February 19, 2011 Share #1 Posted February 19, 2011 Advertisement (gone after registration) Does anyone know what the comparison is between the various S lenses and their FF 35mm equivalent? As an example, the 70mm on the S is roughly equivalent to (?) and 2.8 on a FF 35mm SLR is equivalent to what aperture on the S in terms of DOF? Seems like the 120mm at 2.5 looks a lot like the canon 85 1.2 in terms of DOF but was wondering if anyone has a more formal description. Thanks, Derek Link to post Share on other sites More sharing options...
Advertisement Posted February 19, 2011 Posted February 19, 2011 Hi ddanois, Take a look here S Lens focal length comparison to FF 35mm for DOF . I'm sure you'll find what you were looking for!
JMacD Posted February 19, 2011 Share #2 Posted February 19, 2011 120 on the S equals 96 on an M Just multiply 0.8 time the S value to get what it is in 35mm Link to post Share on other sites More sharing options...
ddanois Posted February 19, 2011 Author Share #3 Posted February 19, 2011 Thanks for the feedback. Any sense of the aperture comparisons in terms of DOF? Link to post Share on other sites More sharing options...
Dougg Posted February 19, 2011 Share #4 Posted February 19, 2011 ... Any sense of the aperture comparisons in terms of DOF? DoF is a fuzzy subject that may get argumentative when you try to get specific. I'd suggest just calling it a stop or two difference ... or read through this recent thread on the subject: http://www.l-camera-forum.com/leica-forum/leica-s2-forum/135291-s2-depth-field-data.html Link to post Share on other sites More sharing options...
tom0511 Posted February 19, 2011 Share #5 Posted February 19, 2011 I have read the difference DOF wise should be about 1 stop. I guess this is meant at same print size. Link to post Share on other sites More sharing options...
01af Posted February 19, 2011 Share #6 Posted February 19, 2011 For the same DOF in the final print, at the same print size, shooting from the same distance and with equivalent (not equal) focal lengths, the S lens must be stopped down by 2/3rds of an f-stop more than the 35-mm-format camera's lens. This assumes a long (or longish) shooting distance; in macro photography the S lens must be stopped down a bit more. In real life, either half an f-stop or a full f-stop both should be close enough. Link to post Share on other sites More sharing options...
ddanois Posted February 20, 2011 Author Share #7 Posted February 20, 2011 Advertisement (gone after registration) In other words, f2.8 on a FF 35mm system would roughly equate to f4.0 on the S lens of similar focal length? Link to post Share on other sites More sharing options...
01af Posted February 20, 2011 Share #8 Posted February 20, 2011 In other words, f/2.8 on a 35-mm full-frame system would roughly equate to f/4 on the S lens of similar focal length? Yes, basically ... except the lens mustn't be of similar focal length but of equal angle of view, i. e. equivalent focal length. Link to post Share on other sites More sharing options...
gjames9142 Posted March 18, 2011 Share #9 Posted March 18, 2011 This helps me a bit, because I had assumed that the 70 mm was the equivalent of a "normal" i.e 50 mm lens. This would have meant that the 35 was half that - or a 25 mm. But the .8 factor means that the 70 is in fact equivalent to a 56mm. lens. Link to post Share on other sites More sharing options...
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