Retard-level question on focal length

It will be a 24mm lens. No if's, and's, or but's about that.

It will shoot photos similar in field-of-view and depth-of-field to those shitty old fixed lens rangefinders with 38mm f4-or-so lenses.

File: FX-and-DX-camera.png (33KB, 650x481px) Image search: [Google]

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>>3019268
The actual, physical focal length is exactly as the name implies, 24mm.

However on a APS-C camera such as yours the field of view will be more akin to that of a 38mm focal length lens.

This is because the area capturing light is smaller than that of a full frame camera. The image I've attached should explain how this works

>>3019268
Basically, the lens will be 24mm but it will have the overall field of view of a 38mm lens. The depth of field will look like f/4 not f/2.8. It will let in the same amount of light as a f/2.8, it just won't have as smooth of a background.

>>3019275
So if I were to compare it to my 18-55 (purely on levels of zoom), it would be the equivalent of setting the length to 24mm?

>>3019278
Yes correct

>>3019280

Alright, thanks for the help!

>>3019268
This really makes me wonder why lens manufacturers don't put a few different versions of what the focal length would be on the lens or in the manual.

We should have a universal system for measuring lens fov, dof, and compression.

>>3019345

Compression is a function of perspective tho

>>3019268
The aps-c sensor on the t6i has a 1.6 crop factor. Any lens you put on it will need to be multiplied by 1.6 to get its equivalent focal length on a full frame sensor. Example a 50mm lens on your camera will act like an 80mm because 50x1.6=80

It's a fucking great lens, get it.

>>3019345
>We should have a universal system for measuring lens fov, dof, and compression.

Well, every lens has FoV listed in its specs (for the intended film/sensor format(s)), but somehow people prefer focal length; depth of field is a complex function that includes distance to subject so it cannot be expressed as a fixed value; and perspective compression doesn't have any numerical representation at all.

File: standards.png (24KB, 500x283px) Image search: [Google]

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>>3019345