If I attach a 35mm SLR lens on a DSLR...

[julioamendoza]

could I afix a thin sticker around the lens (like a belt) and mark the

equivalent focal lenghts for use in a DSLR?

 

For instance, I have the Minolta AF 28-80mm 3.5-5.6(D) which is a lens for 35mm

SLRs. It's got numbers for 28 35 50 70 80mm focal lengths.

 

The belt would be marked accordingly 42 52.5 75 105 120mm, assuming the crop

factor of the DSLR (say the the 7D or Sony Alpha 100), is 1.5.

 

Am I pretty much right or just plainly wrong?

[michaelging]

I hope you are framing the photo by looking though the viewfinder and composing it on the ground glass, not by a set of marking on the side of the lens.In answer to your question , you could do a re-calibration on the side of the lens , but what purpose would it serve?

[james_frater]

I do not know about anyone else, but I rarely, if at all using the focal length markings on a lense. I look through the viewfinder and if it is what I want I shoot it.

[julioamendoza]

Why do you want the belt sticker?

 

If you know the corresponding numbers, just memorize them man.

 

Salud!

[anupam]

You do know that focal length doesn't chnge on the DSLR, right? Only the angle of view does.

 

-A

[bill_thorlin]

Stick with film or wait for full frame - either way you won't have a problem :)

[nate_macdonald]

You can do it, sure. However it would be inaccurate, the focal length is not changing. All that's happening when you take a shot with an APS sensor is cropping what would have been a full frame shot.

[julioamendoza]

Great!!

 

"..., the focal length is not changing."

 

That was a very simple and straight one. Now I better understand what's happening... cropping the image.

 

Yes, that's what I am trying to do, to stick with film SLR, yet striving to get good photos on film (I would probably get better images with a DSLR, but that would be because of the camera itself not because of me).

 

Thank you all for the help.

 

P.S. Won't ever think on that belt again.