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Forum: Pentax SLR Lens Discussion 03-15-2024, 02:12 PM  
M42 to k mount adapter troubleshooting
Posted By m42man
Replies: 20
Views: 746
The genuine Pentax adaptor is designed to be slightly undersize so that it's a loose fit in the camera - which makes it straightforward to remove. When the lens is screwed in, the adaptor is pulled toward the lens back plate and clamps the adaptor firmly to the camera's mount.

Third-party adaptors are generally to be avoided, as typically they won't satisfy the above, and may well be prone to jamming.
Forum: Pentax SLR Lens Discussion 03-15-2024, 02:03 PM  
Aperture diffraction question
Posted By m42man
Replies: 10
Views: 620
Straightforward - the linked articles are of course absolutely right. The effect of diffraction at the point of focus is dependent on f-number only.
Forum: Monthly Photo Contests 03-11-2024, 01:30 AM  
Don't Take the Plunge!
Posted By m42man
Replies: 3
Views: 83
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Forum: Monthly Photo Contests 03-11-2024, 01:29 AM  
A400 Up Up and Away
Posted By m42man
Replies: 34
Views: 206
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Forum: Monthly Photo Contests 03-11-2024, 01:29 AM  
Monthly Competition
Posted By m42man
Replies: 59
Views: 291
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Forum: Monthly Photo Contests 02-08-2024, 02:26 AM  
Mist on the Mountain Path
Posted By m42man
Replies: 31
Views: 300
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Forum: Monthly Photo Contests 02-08-2024, 02:25 AM  
Sunrise on heather blossom
Posted By m42man
Replies: 25
Views: 221
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Forum: Monthly Photo Contests 01-16-2024, 02:55 AM  
Poll: Expired Contest Poll VOTE NOW - Photo Contest #208 Poll (Frame within a Frame - December 2023)
Posted By m42man
Replies: 8
Views: 2,167
Ooh dear - spoilt for choice (again!)...
Forum: Monthly Photo Contests 01-08-2024, 12:21 AM  
Fushimi Inari Shrine (Thousands Gates Shrine, Kyoto)
Posted By m42man
Replies: 10
Views: 154
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Forum: Monthly Photo Contests 01-08-2024, 12:20 AM  
View from a cave
Posted By m42man
Replies: 41
Views: 351
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Forum: Winners' Showcase 12-08-2023, 12:22 AM  
November, 2023 Third Place: Eiffel Tower
Posted By m42man
Replies: 25
Views: 191
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Forum: Monthly Photo Contests 12-08-2023, 12:18 AM  
Rare Light
Posted By m42man
Replies: 58
Views: 381
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Forum: Winners' Showcase 11-08-2023, 01:49 AM  
October, 2023 Winner: Victorian Dream
Posted By m42man
Replies: 69
Views: 464
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Forum: Monthly Photo Contests 11-08-2023, 01:48 AM  
Fun in the City... Ride "TAKE OFF"
Posted By m42man
Replies: 44
Views: 337
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Forum: Monthly Photo Contests 11-08-2023, 01:47 AM  
Matera by Night
Posted By m42man
Replies: 25
Views: 241
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Forum: Monthly Photo Contests 10-08-2023, 09:50 PM  
Okay, there is little traffic....
Posted By m42man
Replies: 15
Views: 149
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Forum: Monthly Photo Contests 10-08-2023, 09:48 PM  
3 Decades of Service
Posted By m42man
Replies: 19
Views: 270
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Forum: Monthly Photo Contests 10-08-2023, 04:32 AM  
Launching Field
Posted By m42man
Replies: 41
Views: 445
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Forum: Monthly Photo Contests 10-08-2023, 04:28 AM  
Silverton Coal Fired Steam Locomotive and Engineer
Posted By m42man
Replies: 25
Views: 328
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Forum: Pentax SLR Lens Discussion 10-03-2023, 10:24 AM  
Ordered a Super Takumar 55 f/1.8
Posted By m42man
Replies: 19
Views: 1,077
Sorry about that. If you have a K-mount lens fitted, you should find it'll work well (assuming it's 50mm and above - 28mm lenses don't work at all well using C-i-F, I've found) - make sure the camera's set to AF.S.
Forum: Pentax SLR Lens Discussion 10-02-2023, 01:38 PM  
Ordered a Super Takumar 55 f/1.8
Posted By m42man
Replies: 19
Views: 1,077
For lenses 50mm and above, I find the green hexagon works well, and in particular, Catch-in-Focus. This allows the camera to choose when to fire the shutter automatically, as you slowly turn the focus ring. As Jonathan Mac has said, test out which direction from which to approach focus - some cameras/lenses will give more accurate results when approaching from foreground, others from background (the former being more common in my experience).

Edit: Oops! Just realised we're talking about an M42 lens (of course!) - CiF doesn't work with anodised (non-conductive) lens bases. So, very good for most K-mount lenses, but not M42.
Forum: Pentax DSLR Discussion 09-10-2023, 12:59 PM  
K10D out of focus
Posted By m42man
Replies: 6
Views: 866
This "mirror-droop" is a problem to which all K10Ds are unfortunately prone, and is down to a worn-out mirror support/hinge. Since the mirror is out of kilter, it affects both auto and manual focus via the viewfinder. You've managed to compensate the AF via the debug function - you can also achieve this by taking off the bottom plate and locating the 3 adjustment screws. However, I'd leave this alone if you're happy with the AF results you're now getting. (It affects AF only, and has zero effect on the viewfinder image.)

It's not worth fiddling with shims for the focus screen in my view - just use the VF for composition and let the AF do its stuff.

Sorry to be the bringer of bad news. It's such a shame that the K10D is so afflicted, because it's a great camera otherwise. Perhaps try to find a little-used example at the right price?
Forum: Pentax DSLR Discussion 09-10-2023, 12:42 PM  
K10d query
Posted By m42man
Replies: 14
Views: 871
I'd turn the dust-removal to "off". It's pretty useless, and I can't help feeling it risks damaging, or at least wearing-out, the stabilisation function.
Forum: Monthly Photo Contests 09-07-2023, 06:28 AM  
Astronomy
Posted By m42man
Replies: 17
Views: 229
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Forum: Monthly Photo Contests 09-07-2023, 06:28 AM  
Night in Marzi, Calabria
Posted By m42man
Replies: 6
Views: 315
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