Applied Logics

DOF etc.

In this edit you neglect to note that smaller formats use a smaller circle of confusion criterion. Hence you replaced correct info with incorrect info. You may respond here or on the article talk page if you disagree or would like more explanation. Dicklyon (talk) 06:17, 20 March 2015 (UTC)

---

My edit stated correct in that the DoF is never dependent on the film (Ilford FP4 vs T-Max 100) nor sensor (K-3 sensor vs D800 sensor) but only a property of the lens (focal length and f-stop) at any given distance of object to camera. circle of confusion is dependent on so many other things such as spherical vs aspherical, number of leaves in the diaphragm, diaphragm having straight or curved leaves, regular glass or ELD glass, coating type (if any), and, regarding the sensor, so much more than the sensor size such as: actual pixel size, space between each pixel, AA filter type (if any), etc., not to mention other things such as camera shake, atmospheric aberrations, etc.

A Pentax-F SMC 50mm f1.7 lens on a k-3 with AA turned off, tripod mounted, mirror locked up, remote-triggered can have a much smaller CoC than a Sigma 18-300mm lens set at 50mm on a D800 hand-held and finger-triggered with them both set to 1/125 s shutter speed, f4.5 and 3m to the subject. The comparison was how does the size of the sensor affect DoF and it does not.

To discuss how the size of the sensor affect CoC is an entirely different discussion. You can add that if you wish but it probably belongs on the CoC page and not this one since the size of the sensor is the least of the concerns (as, all else being equal, a 16 megapixel APS-C vs a 24 megapixel FF can be a mixed bag depending on who and how each sensor was made ...though theoretically, they can have the same pixel size and pixel spacing). Method of processing the color information can also affect CoC but not DoF.

Please return my edits.

Applied Logics 22:43, 21 March 2015 (UTC)

Please don't revert talk comments

Probably inadvertantly, you removed my talk reply from Talk:Crop factor; so I reverted to behind that; please try again to add your comments without reverting mine. Dicklyon (talk) 01:00, 27 March 2015 (UTC)

Please discuss

Per WP:BRD process, please join the discussion that I started at the end of the section Talk:Crop_factor#Estimating_sensor_performance before re-adding your changes yet again. Dicklyon (talk) 23:21, 28 March 2015 (UTC)