I was trying a Canon S95 that was lying around, and I noticed that at 22.5mm (105mm equivalent on 35mm), the perspective is about the same as a 105mm lens. The same goes for all other focal lengths.

I'm wondering how that works. I learned that with DX, a 35mm lens will provide a FoV of a 52.5mm on a 1.5x crop factor, but the perspective of a 35mm still. However, on the point-and-shoot, the perspective at 22.5mm isn't 22.5mm, it's about 105mm.

i'm a little confused when you say "perspective"

do you mean angle of view?

Example: My 35mm 1.8G on my D5200 is always going to be a 35mm. It is zoomed in like a 52.5mm, but it is still a 35mm. The distortion and background compression will be that of a 35mm lens.

The Canon S95 isn't the same way. At 22.5mm, it is zoomed in like a 105mm, but it also has the perspective and DoF of a 105mm lens (distortion levels, the background compression, etc). I guess it's not a 35mm camera... so I'm just wondering how I would figure each thing out (ex. what 22.5mm really means on this camera).

This post was edited by Canadian_Man on Sep 2 2013 03:39pm

I´m going out on a limb here and say that you are wrong about the 35mm on a crop having the "perspective" of exactly that focal length. What a crop sensor does is add the crop factor to the focal length of your lens. it should be about equivalent to a 50mm on a full frame, including distortions and all that. I`ve never really compared the exact same shot with a crop and a full frame, but the "perspective" ( which by the way cant be the right term for what you are trying to describe ) shouldnt differ. what usually changes is the depth of field.

same should count for your powershot. It has a 6-22,5mm lens, which is supposed to equal the pretty common zoom of 28-105mm on full frame. this gives us a crop factor of around 4.6. the distortion, or "perspective" as you call it, therefore equals the distortion or "perspective" you get on a full frame. I´m pretty sure it´s not as simple as that, seeing how the powershots sensor has a totally different aspect ratio than the 35mm sensors, but it should be about right.

Correct me if I´m wrong.

rgds

To be straight-to-the-point, you are incorrect about the 35mm part. You might not be incorrect about everything, though. What I do know is that a 35mm lens is going to be a 35mm lens on anything, and then the crop-factor will simply use a portion of the 35mm but with all other properties of the 35mm (so 52.5mm on a 1.5x crop); as shown in the picture below.

The only difference is going to be you have a zoomed-in image, but everything else remains the same.

I'm trying to do some google research to learn about how lenses and sensors work on various other things (ex. point-and-shoot, mirrorless, etc), but it's difficult finding good information on my google searches. I suppose the 6-22.5 lens must behave differently since maybe it's based on a smaller standard than a DSLR, but I really don't know at all.



This post was edited by Canadian_Man on Sep 2 2013 05:22pm

no DoF does change depending on your crop factor
the DoF on a cropped sensor is smaller than on a FF

I thought this was military related lol.

lool

Is your guild recruiting?

Guess so hahaha.