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K_50 aperture block issues / 55-300 PLM lens

Started Jun 28, 2020 | Discussions thread
DougOB
DougOB Veteran Member • Posts: 3,176
Re: K_50 aperture block issues / 55-300 PLM lens

karoly7603 wrote:

My Pentax 55-300 PLM has strange aperture behaviour between 98mm-200mm roughly. I set to f4.5 but when I dial it immediately jump to f5.6 I cannot set to f5.0. Below 98mm doesn't have any issue. Does somebody has similar problem? Is it normal?
Thanks.

What Program Line are you using?  MTF?

Doug

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