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Forum: Pentax K-30 & K-50 06-19-2018, 12:08 PM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By altis
Replies: 390
Views: 91,049
I've just pulled apart an SF7 but there was none to be found - unless it's buried deep inside.

Has anyone tried using a tape head demagnetizer?
Forum: Pentax SLR Lens Discussion 01-31-2018, 06:52 AM  
FA vs. D FA for K-1 - a real difference in image quality?
Posted By altis
Replies: 30
Views: 4,511
One thing to be aware of with film-era lenses is 'hot spots' that can mar certain images. Some old lenses have a particularly flat rear element. This combined with poor coatings and the new shiny sensors can result in a sky blue circle appearing in the middle of high contrast shots. The strength and size of the circle depends on the scene and f-stop.

You can reduce the effect with some effort:
Correcting SMC-F 50/2.8 macro hot spot: Pentax SLR Talk Forum: Digital Photography Review
Forum: Pentax DSLR Discussion 01-28-2018, 02:10 PM  
Sensor research
Posted By altis
Replies: 5
Views: 1,311
Forum: Pentax Camera and Field Accessories 11-07-2017, 06:35 AM  
Battery cover for AF200FG
Posted By altis
Replies: 3
Views: 753
It's not listed but you could try UScamera:

http://www.uscamera.com/pentax_parts.htm
Forum: Pentax DSLR Discussion 09-25-2017, 12:38 PM  
SR and monopod?
Posted By altis
Replies: 19
Views: 1,983
I'm with dms.

A change in the stiffness of the mount will upset the dynamics of the SR control system and will likely lead to ringing as the control loop becomes unstable.

Control theory - Wikipedia
Forum: Pentax Camera and Field Accessories 07-19-2017, 07:47 AM  
Double Lens Adapter Question (Canon to Pentax)
Posted By altis
Replies: 14
Views: 1,210
Replace the mount on the lens:
Leica & Pentax & Nikon | Leitax

Replace the mount on the camera:
Pentax K+ Multi Mount - Adaptist
Forum: Pentax DSLR Discussion 07-12-2017, 11:48 PM  
Firmware updates
Posted By altis
Replies: 16
Views: 2,438
Having recently bricked a large and expensive UPS while trying a firmware upgrade, I'd suggest that there are benefits to leaving well alone after all.
Forum: Pentax DSLR Discussion 07-08-2017, 01:06 PM  
The Six-Megapixel Club
Posted By altis
Replies: 3,185
Views: 295,458
Just received an F135/2.8 so I put it on my *istD and took it out in the garden to see what it could do wide open:







Forum: Pentax SLR Lens Discussion 12-06-2016, 01:09 PM  
other makers lens for pentax k fit
Posted By altis
Replies: 11
Views: 2,219
Forum: Pentax SLR Lens Discussion 11-23-2016, 08:17 AM  
Diagram of K KA KAF etc
Posted By altis
Replies: 1
Views: 766
Articles > Articles and Tutorials > History of the K-Mount:

The Evolution of the Pentax K-mount - Articles and Tips | PentaxForums.com

Also see BDimitrov:

http://www.bdimitrov.de/kmp/
Forum: Pentax SLR Lens Discussion 10-26-2016, 11:09 AM  
SMC-A 50mm f/1.4 Hot Spotting
Posted By altis
Replies: 14
Views: 1,132
I've noticed it too with the F 50/2.8 macro. Happens when I try to get a bright white background with flash.

Here's how I fixed it - well sort of. It doesn't make it all go away but at least it's not so offensive:
Correcting SMC-F 50/2.8 macro hot spot: Pentax SLR Talk Forum: Digital Photography Review
Forum: Pentax SLR Lens Discussion 08-02-2016, 11:37 PM  
Why third party lens companies are running away?
Posted By altis
Replies: 124
Views: 10,198
Possibly also something to do with the ready availability of old K-mount lenses.

It's difficult for a third-party manufacturer to undercut the OEM with a big of second-hand market snapping at their heels.
Forum: Pentax SLR Lens Discussion 06-26-2016, 01:09 PM  
K-Mount digital pin protocol, power supply
Posted By altis
Replies: 10
Views: 2,131
It could well use something like 1-wire from Dallas Semiconductor:

https://en.wikipedia.org/wiki/1-Wire

---------- Post added 06-26-16 at 01:51 PM ----------

For example, look at the DS28E04:

https://www.maximintegrated.com/en/products/digital/memory-products/DS28E04-100.html
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