Its a nice summary and mostly right. But I think you are ignoring a
bit, which could be an disadvantage for 35mmFF.
Your DOF part only explains or better mainly explains the narrow DOF
part. What about the other side Crop F:5 equals what in 35mmF and
what you could gain with a crop. This part is cut down to absolutely
minimum.
I'm not sure what you mean here. I mean, I give an example with crop in the Q&A section here:
http://www.josephjamesphotography.com/equivalence/#Q&A
"Q: Won't larger sensors suffer diffraction softening earlier than smaller sensors since they have to stop down for the same DOF?
A: No. The effects of diffraction softening, just as focal length and DOF, are proportional to the FM (ratio of sensor diagonals). For example, if 4/3 is diffraction limited at f/8, then 1.6x will be diffraction limited at f/10, and 35mm FF will be diffraction limited at f/16."
and also in the Definition of Equivalence here:
http://www.josephjamesphotography.com/equivalence/#equivalence
"The following settings will be equivalent (rounded to the nearest 1/3 of a stop):
1) 5D at 80mm, f/8, 1/200, ISO 400
2) D300 at 53mm, f/5, 1/200, ISO 160
3) 40D at 50mm, f/5, 1/200, ISO 160
4) E3 at 40mm, f/4, 1/200, ISO 100"
In addition, there are many other examples throughout the essay.
The other thing you are ignoring as well is shutter speed
advantage/disadvantage of crop/35mm when doing wildlife sport
photography and even AL photography. Lets say F5 on a Crop at ISO 800
or even 1600 is on 35mmFF what and whats the impact. That part is
missing as well.
Other than that it a good guide.
Again, I'm not seeing it. As shutter speed is a
fundamental in the definition of equivalence:
"Equivalent images are images from two different cameras that look as similar as they possibly can. It is critical to note that "equivalent" does not mean 'equal' -- I cannot stress this point enough. The definition of 'equivalent images' is as follows:
1) Same perspective (subject-camera distance)
2) Same FOV (field of view / framing)
3) Same DOF (depth of field) / aperture (aperture = focal length / f-ratio)
4) Same shutter speed
5) Same output size (same number of pixels / display size)"
I don't see where I'm ignoring it. If you could direct me to that section and quote, I'd appreciate it, so I could correct it.
--
--joe
http://www.josephjamesphotography.com
http://www.pbase.com/joemama/