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K_50 aperture block issues / 55-300 PLM lens

Started Jun 28, 2020 | Discussions thread
karoly7603
karoly7603 Regular Member • Posts: 235
Re: K_50 aperture block issues / 55-300 PLM lens

DougOB wrote:

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.

Uhh.... I think I remember this, it came up a few years ago but I can't remember what it was (I haven't had my coffee yet). I remember testing it though...

What camera body or is it multiple bodies? What shooting mode? Auto ISO?

Let me try to engage my brain/memory...

Doug

Pentax K-70 and I use TAV mode with Auto Iso.

It means is it camera body or lens issue? Funny that I saw a Pentax K-70 photo with the same 55-300 PLM lens here on dpreview gallery at 108mm f5.0, but how is it possible?

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