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Forum: Pentax Lens Articles 04-16-2013, 10:08 PM

Sticky: How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc)
Posted By altopiet

Replies: 358
Views: 416,906

Have a look at the shots I took with this beast, the ISO, Shutter speed and f stop is indicated. With Pentax cameras you can comfortably let the ISO go up a bit and still get clear shots, and if you shoot RAW and do a bit of PP you'll still get reasonable results.

https://www.pentaxforums.com/forums/lens-sample-photo-archive/216174-noflexar...m-samples.html

EDIT: This was done in M with green button.

Forum: Pentax Lens Articles 04-16-2013, 08:59 AM

Sticky: How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc)
Posted By altopiet

Replies: 358
Views: 416,906

Manual lenses can only be used in M and AV modes. If you put it in TAv, Tv or Sv modes it will revert to Av mode. In K, M and M42 lenses in Auto mode, will always be wide open in Av mode. If you put them in M mode you first manually set your aperture on the ring to the desired aperture and the desired ISO, then press the green button while aiming toward the target, which will stop down to the aperture setting picked by you, take a light measurement and taking into account the ISO setting you picked, decide on a suitable shutter speed to capture a correctly exposed image. Using a pre-set or M42 lens in manual mode, you can use Av mode. As there is no aperture lever to be stopped down, what you see through the VF, or live view, is what you get. When you stop down on the aperture ring you'll see it get darker and the shutter speed changing accordingly, adapting to the aperture getting smaller. You can change the shutter speed, but will not get a correctly exposed image

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