Originally posted by reh321 Focal length of a lens is needed for IBIS and AF.
If your lens provides AF services - such as screw drive {like your Pentax-FA lens} or in-lens AF motor - it will report focal length to the body; otherwise (*) body will ask you for that value when you mount the lens.
(*) Thus, when I used a Takumar, Pentax-M, or Pentax-A {which does have an "A" setting}, body would ask for focal length.
Good, thanks for the information. It seems like I ran into that situation you describe with one of my really older lenses. I have a Cosinon F/4 200mm MC, and while I've not used it in a long time, I was playing around with my *ist DS on a beach vacation and tried it out (with a 2x converter to boot!)...it asked me for a focal length.
And regarding my 28-80 lens we were talking about to begin with, it does do AF, so I should have figured it is 'connected' to the camera electronically too. Sorry for the silly questions and asking before thinking!
Scott
---------- Post added 12-10-18 at 12:17 PM ----------
Originally posted by runswithsizzers EXIF is short for Exchangeable Image File Format. EXIF a standard established by the Japan Electronic Industries Development Association (JEIDA) for the purpose of embedding metadata in image files. Like most standards, it gets updated from time to time, and each update gets a version number. That's all "0230" means - version 0230, (or 2.30).
Just to be clear, all that information (properties) such as focal length, shutter speed aperture, etc. are collectively called "metadata" or "EXIF" information. Most software that shows EXIF data does not show all of it. Most likely your software is showing you a limited number of items that someone thought you would be most interested in. Some other software might show more or fewer items, but I would think most would show actual focal length, and not just 35mm equivalents.
Thanks for the useful reply! And just for the record, I wasn't even using real photo software, I was just in Windows 10, file explorer, clicked on the Properties option to look. It gave a good bit of details, but like you said, there is some it probably didn't.
Scott