http://lawrenceripsher.com/blog/2007/05/olympus_e410_re_3.html Photos, Reviews, Instruction Tue, 27 Jul 2010 12:59:36 +0000 http://wordpress.org/?v=2.9.2 hourly 1 http://lawrenceripsher.com/blog/2007/05/olympus_e410_re_3.html/comment-page-1#comment-296 Edward Wed, 10 Dec 2008 12:09:13 +0000 http://lawrenceripsher.com/2007/05/olympus_e410_re_3.html#comment-296 <p>Sorry, the effective aperture does not change. At f/1.4 the focal length (50mm) is 1.4 times the aperture diameter. Put a smaller sensor behind it to capture the picture, and you reduce the field of view (to 100mm-equivalent) but you do not change the f-stop: the focal length is still 1.4 times the diameter, so it is still f/1.4.</p> Sorry, the effective aperture does not change. At f/1.4 the focal length (50mm) is 1.4 times the aperture diameter. Put a smaller sensor behind it to capture the picture, and you reduce the field of view (to 100mm-equivalent) but you do not change the f-stop: the focal length is still 1.4 times the diameter, so it is still f/1.4.

]]> http://lawrenceripsher.com/blog/2007/05/olympus_e410_re_3.html/comment-page-1#comment-295 James Fri, 23 Nov 2007 07:10:25 +0000 http://lawrenceripsher.com/2007/05/olympus_e410_re_3.html#comment-295 <p>Surely the F1.4 becomes F2 as apertures don't double arithmeticaly? e.g. single stop aperture scale goes 1.4, 2, 2.8, 4, 5.6, 8, 11, 16 etc</p> Surely the F1.4 becomes F2 as apertures don't double arithmeticaly? e.g. single stop aperture scale goes 1.4, 2, 2.8, 4, 5.6, 8, 11, 16 etc

]]> http://lawrenceripsher.com/blog/2007/05/olympus_e410_re_3.html/comment-page-1#comment-294 Lawrence Ripsher Wed, 23 May 2007 19:46:45 +0000 http://lawrenceripsher.com/2007/05/olympus_e410_re_3.html#comment-294 <p>Hey Dario, on cropped sensors, both the focal length and depth of field increase. So on a 2x cropped sensor, a 50mm f/1.4 effectively becomes equivalent to a 100mm f/2.8 (on a 35mm body).</p> Hey Dario, on cropped sensors, both the focal length and depth of field increase. So on a 2x cropped sensor, a 50mm f/1.4 effectively becomes equivalent to a 100mm f/2.8 (on a 35mm body).

]]> http://lawrenceripsher.com/blog/2007/05/olympus_e410_re_3.html/comment-page-1#comment-293 Dario Grzelj Wed, 23 May 2007 06:26:33 +0000 http://lawrenceripsher.com/2007/05/olympus_e410_re_3.html#comment-293 <p>You said "..an old $20 OM 50mm f/1.4 (100mm f/2.8 equivalent when mounted on the E-410)..." but I think that 50 1.4 is 1.4, not 2.8 </p> You said "..an old $20 OM 50mm f/1.4 (100mm f/2.8 equivalent when mounted on the E-410)…" but I think that 50 1.4 is 1.4, not 2.8

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