alexc Posted April 29, 2009 Share #1 Posted April 29, 2009 Advertisement (gone after registration) I know it was covered before. Just wanted to clarify. When I use aperture stop 5.6 from distance 3m according to DOF chart DOF is: 1,424 to ∞ However due to the crop factor of M8 the correct DOF is under aperture stop of 4 which is: 1,670 to 17,48. Am I correct? Quote Link to post Share on other sites More sharing options...
Advertisement Posted April 29, 2009 Posted April 29, 2009 Hi alexc, Take a look here summilux 21/1.4 DOF. I'm sure you'll find what you were looking for!
cbretteville Posted April 29, 2009 Share #2 Posted April 29, 2009 According to the Online Depth of Field Calculator the near limit is 1.6m and the far limit is 24.8m - Carl Quote Link to post Share on other sites More sharing options...
alexc Posted April 29, 2009 Author Share #3 Posted April 29, 2009 sounds right. i am using leica charts from their website. Quote Link to post Share on other sites More sharing options...
bybrett Posted April 29, 2009 Share #4 Posted April 29, 2009 Depth of field is what you see not what you calculate. Quote Link to post Share on other sites More sharing options...
carstenw Posted April 29, 2009 Share #5 Posted April 29, 2009 Depth of field is what you see not what you calculate. Or you can choose the correct CoC for what you see, and then calculate it. Quote Link to post Share on other sites More sharing options...
dalippe Posted April 30, 2009 Share #6 Posted April 30, 2009 I know it was covered before. Just wanted to clarify. When I use aperture stop 5.6 from distance 3m according to DOF chart DOF is: 1,424 to ∞ However due to the crop factor of M8 the correct DOF is under aperture stop of 4 which is: 1,670 to 17,48. Am I correct? I'll trust that you're reading off the lens correctly and not check that. But yes, you are correct that a good rule of thumb given the M8 crop factor is to read the depth of field as if your lens were one stop more open than it is. David Quote Link to post Share on other sites More sharing options...
alexc Posted April 30, 2009 Author Share #7 Posted April 30, 2009 Advertisement (gone after registration) thank you David Quote Link to post Share on other sites More sharing options...
SJP Posted April 30, 2009 Share #8 Posted April 30, 2009 Mmmmm. I don't get it. According to summaron 35 lens markings at f/5.6 it is 2.1 - 5.2 (not 1.46 - ∞). This is the same for all 35 mm lenses. Using my spreadsheet I get for CoC = 31 micron 2.22 - 5.23 metres which coincides with the lens barrel. For the M8 it would then be CoC = 23.3 micron and 2.27 - 4.44. The f/4 lens markings on the barrel indicate 2.3 - 4.5 which is close enough. So the rule of thumb to use 1 stop correction with the M8 is pretty much OK. However the numbers listed by Alex© are completely different to my lens markings (& the calcuation). Weird. Quote Link to post Share on other sites More sharing options...
akiralx Posted April 30, 2009 Share #9 Posted April 30, 2009 According to the Online Depth of Field Calculator the near limit is 1.6m and the far limit is 24.8m - Carl Yes, using the DOF calculator app on my iPod, specifically for the M8 and that lens/subject data it gives near limit as 1.60m and far as 23.09. Quote Link to post Share on other sites More sharing options...
stunsworth Posted April 30, 2009 Share #10 Posted April 30, 2009 It's all subjective anyway. It's more an indication of acceptable blurriness than depth of field. I always used the one stop technique on a film M. With the M8 I use two stops. Quote Link to post Share on other sites More sharing options...
SJP Posted April 30, 2009 Share #11 Posted April 30, 2009 (edited) Mmmmm. I don't get it. According to summaron 35 lens markings - snip - Weird. Blind as a bat it should have been 21 mm. For 21 mm, f/5.6 @ 3m using my spreadsheet I get for CoC = 31 micron 1.38 - ∞ metres meaning the DOF chart (1.46 - ∞) is roughly OK. For the M8 CoC = 23.3 micron and the spreadsheet gives 1.58 - 33.35 metres. This calculation includes diffraction, unlike the DOF calculator, explaining the slightly different numbers. All is well after all. Edited April 30, 2009 by SJP Quote Link to post Share on other sites More sharing options...
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