>>2738562
A lens's focal length is its focal length.

A smaller sensor with a certain lens will see less than a full frame sensor will.

To get the same field of view that one lens and sensor and lens will give on a full-frame sensor on a crop sensor, you will need a wider lens.

The same principle works in reverse for sensors larger than 35mm full-frame format.

>>2738562
>Do crop lenses give the same field of view to APS-C lenses that say, a full frame lens of the same focal length would provide?

Yes.

>However, would a crop lens of 50mm provide a field of view to a 1.5 crop sensor a 50mm field of view?

No.

The Crop / FF lens distinction ONLY relates to how large of an image circle will project. A Crop and FF lens of 50mm will give the same FoV on any camera, it's just that you'll likely have some vignetting on the crop lens on larger sensors.

>>2738562
If you use a 50mm crop lens on a crop body, it will give you the same field of view as if you used a 50mm full-frame lens on your crop body.

That field of view is equivalent of using a 75mm full-frame lens on a full-frame body.

You're essentially asking if your crop lenses' focal lengths are already corrected for the crop factor. They aren't.

>>2738562
>>2738572
>Do crop lenses give the same field of view to APS-C lenses
>Yes

How does one even define field of view for a bare lens (without sensor, film or eyepiece)?

>>2738724
You don't. Why would you? A lens is useless without something to actually use it with.

SURE WOULD BE NICE IF WE ACTUALLY USED FOV IN DEGREES TO LABEL A LENS RATHER THAN A PHYSICAL PROPERTY

>>2738809
And what would you do for FF lenses that also mount to APS-C cameras?

>>2738724
you can't, you can only state the focal length, and that implies you know what kind of body you'll be mounting the thing on
field of view is a function of the sensor's coverage and focal length