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02-26-2021, 08:55 AM   #1
m36789
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Understanding Pentax K1000 Aperture

Hi,

I was just wondering if someone would be able to confirm that while the Pentax K1000 is being focused/prepared for image capture, the aperture appears to be fully open.

My camera's light meter responds appropriately to changes in aperture, but when looking into the lens itself and changing the aperture, it seems "stuck" on the widest setting, but when I remove the lens from the camera body and change the aperture, the iris responds appropriately.

Thanks for any responses in advance! I appreciate the help!

- your local film camera beginner

02-26-2021, 09:29 AM - 1 Like   #2
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Your camera will automatically stop down the lens aperture to the position you set on the ring when you press the shutter button. Light meter knows what aperture you have set because the lens has two levers, one for stopping down the iris and the other to tell the camera what value the ring is set on.

This is so you can meter and focus wide open (focusing on a stopped down lens is a pain, because the viewfinder gets noticeably darker).

Some cameras have a lever for stopping down the lens to see the depth of field preview in the viewfinder. K1000 unfortunately does not have such functionality, as it's pretty bare bones camera.
02-26-2021, 12:34 PM   #3
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Sounds like your K1000 is acting exactly as it is meant to
02-26-2021, 12:40 PM   #4
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Set the shutter speed to B. Set the aperture to something less than the maximum (ie. f16). Open the back of the camera and press and hold the shutter release. You should see that the lens is stopped down while the shutter is open.

02-26-2021, 12:40 PM   #5
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QuoteOriginally posted by First Poster Quote
I was just wondering if someone would be able to confirm that while the Pentax K1000 is being focused/prepared for image capture, the aperture appears to be fully open
That is so you have the brightest image possible while focussing the image. Same principle is in use today on modern DSLR cameras
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