No, you're not confused. A 50 on APS-C with a crop factor of 1.5 = FOV of a 75 on a full frame. The lens is still a 50 no matter which camera it is on, full frame or crop sensor. The field of view is what 'changes'.
For Nikon, Sony, Fuji, Pentax, yes the field of view (FOV) is the full frame equivalent to 1.5x focal lengthNo, of course. Yet it gives the equivalent of a roughly 75; the standard computation of a ff lens on aps-c is 1.5, is it not? Or is this another thing I'm confused about?
Nikon have FX & DX, Canon EF & EF-S, then Sigma & Tamron have their own codes all different.Most lens makers - even 3rd-party ones - have a naming convention that will tell you if it is an APS-C or full-frame lens. For example, with Sony, FE in the lens name means it is full-frame, just an E means APS-C.
I don't remember the other conventions off-hand, but if you look at the lens names on the vendor's site you can often see the naming pattern fairly readily.
Oh, Lord forbid, Petro; by all means, please explicate away. I am here, after all, specifically to get a bit of pedantry. It increaseth understanding. Mixing so-called crop sensor cameras with "full-frame" lenses is quite a new thing for me; as you point out, there is more to it than a simple shift of FOV.But in each case it's only the FOV that changes not the focal length. Focal length is important when calculating the effects of extension or combination with diopters etc. so it's not just that I'm being pedantic.
The APS-C (or smaller) vs FF debate has gone on forever. There are two camps: A lens is physical and doesn't change when you adapt it to FF. The other camp says you have to need to find equivalent framing and equivalent DoF, and so you should take the crop factor into account. Both camps are right, but for various reasons.Oh, Lord forbid, Petro; by all means, please explicate away. I am here, after all, specifically to get a bit of pedantry. It increaseth understanding. Mixing so-called crop sensor cameras with "full-frame" lenses is quite a new thing for me; as you point out, there is more to it than a simple shift of FOV.
That works out at close to 1.3mm which I'm sure must be the size of your allen key.The smallest hex key I have in my tool box measures 0.0505" across the flats. I'm sure that's way too big for that screw.