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11-25-2008, 01:20 PM   #1
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Sears 135mm f2.8 K-mount -- using aperture ring?

Hi, I have recently got my hands on one of the Sears 135mm f2.8.
Now, the lens is in mint condition, looks and feels very good.
My question would be, for the ones that have this lens, what should I do to be able to use the aperture ring? I mean it works when off camera, my K200D is set to allow the use of the ring, but I see no difference, it stays wide open all the time when on the body!
Any thought would be appreciated.
Thanks!

11-25-2008, 01:46 PM   #2
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Assuming yours is a non-A lens, you need to be in M mode in order for the lens auto aperture to work (stop down at exposure time). Any other mode should default to AV with the aperture stuck wide open.

Steve
11-25-2008, 02:41 PM   #3
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Yes, you are so right! I am working in M mode with this lens but I didn't realize I would not see the effects of stopping down in the viewfinder but only in the final picture... doh :ugh:
Thank you for enlightening me
11-25-2008, 04:30 PM   #4
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QuoteOriginally posted by bikerboy_ro Quote
Yes, you are so right! I am working in M mode with this lens but I didn't realize I would not see the effects of stopping down in the viewfinder but only in the final picture...
Same as with modern lenses - aperture stays open to make focusing easyier, stops down only when the shot is taken. Only difference is that with auto lenses, the camera knows the aperture and can meter full time. With manual lenses, the camera doesn't know the aperture, so it can only meter while temporarily stopping down - either by hitting the Green button (which stops down only momentarily but sets an appropriate shutter speed for you) or by doing an optical DOF preview (which stops down for as long as hold the lever in position, and meters the whole time too).

11-27-2008, 09:01 AM   #5
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slow to shoot

Hi,

I just received a similar lens (RMC TOKINA 135mm f2.8). It works well as you explained above, but when I take a picture, it takes two seconds before the shutter is actionned. Which spoils the sport use I had in mind for this lens.

Is this normal? Can it be fixed?

Thanks!

Alain


Pentax K20D
DA 18-250 | FA 50mm f1.4 | Sigma 10-20mm | Tokina 135mm f2.8

Last edited by madbar; 11-27-2008 at 09:15 AM.
11-27-2008, 02:20 PM   #6
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Maybe you are using the Mirror Up function by accident?

You can check that in the shooting menu, by pressing Fn and choosing the Drive Mode
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