Aperture

Zoom Raider

I can't find a thread/post about this:

Lenses with aperture rings... are they designed to work on FSLRs?
I was just messing around with my 70-300mm which has an AR.
If I leave it all the way up to the highest numer (22), my camera
will focus and fire. Move it down to 4.0, it acts like the camera is turned off.
If this is the case, then I guess I shouldn't buy lenses with ARs.

Still learning things.:rolleyes :

Thanks!

Bob Bell

Zoom Raider wrote:

I can't find a thread/post about this:

Lenses with aperture rings... are they designed to work on FSLRs?
I was just messing around with my 70-300mm which has an AR.
If I leave it all the way up to the highest numer (22), my camera
will focus and fire. Move it down to 4.0, it acts like the camera is turned off.
If this is the case, then I guess I shouldn't buy lenses with ARs.

Still learning things.:

Thanks!

Most lenses that have aperture rings are manual or some form of mechanical movement predating electronic control. The ring controls the aperture diaphram just like you do electronically with Canon Glass you just have to do it manually.

Now in those cases where there are tabs on the lenses to move the aperture through a physical connection in the body, you can damage them.

what lens manufactuer are you using and on what body?

Zoom Raider

Bob Bell wrote:

Most lenses that have aperture rings are manual or some form of mechanical movement predating electronic control. The ring controls the aperture diaphram just like you do electronically with Canon Glass you just have to do it manually.

Now in those cases where there are tabs on the lenses to move the aperture through a physical connection in the body, you can damage them.

what lens manufactuer are you using and on what body?

I have the D50 body and my Sigma 70-300mm F4.0-5.6 DG
is the one that has the aperture ring. My smaller Sigma doesn't have one.
The AR moves freely after I unlock its tab, but when it's
set on anything else but 4, the camera will act like it's turned off.
(Press the button to take a picture and it won't do a thing... not even make a sound).

That's why I thought an FSLR body would work with this lens
no matter what number the AR was set on.
And where you said I could damage them, damage what... the lens or the camera?
I hope I didn't hurt either one, especially the camera,`cos I tried this a
few times until I gave up trying to get it to focus and take a picture.
Since it wouldnt do anything but act like it was turned off,
I don't think I've hurt anything.