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Forum: Pentax Q 12-27-2019, 04:32 PM  
Staring at the Sea of Tranquility Q at 5600mm
Posted By dean45
Replies: 7
Views: 2,664
5600mm really fills the Q frame
Forum: Pentax Q 12-27-2019, 04:45 PM  
What's the largest capacity SD card you've used in a Q?
Posted By dean45
Replies: 23
Views: 2,081
I have a 32GB in both my Q10 & Q7.
If you have a bigger blank SD card you want to use put it in & format the card. If the capacity is too great it will not format or
it will format the maximum amount. I found this out with a 2005 vintage Nikon P&S, it would not format a card bigger than
4GB, the instruction book did not say anything since there were no SD HC cards when the camera was made. The Nikon website
only listed older SD cards for the camera I guess they did not care to provide information for their older cameras.
Forum: Pentax K-30 & K-50 12-09-2014, 11:37 AM  
For Auto ISO, what is your maximum setting?
Posted By dean45
Replies: 33
Views: 4,302
I did testing of my K30 mounted on a tripod of resolution charts taped to my garage door. I used a medium f stop. ISO 100, 200, 400, 800 & 1600 all gave the same resolution level. The 100 to 800 looked similar the 1600 looked much poorer even though the same lines could be resolved. ISO 3200 & 6400 fell off in resolution in addition to looking worse in other respects. I did not try ISO 12800 as I maxed out the shutter speed at this f stop.
Shooting at ISO 800 max should be ok with auto ISO setting. Shooting at ISO 800 manual can be a problem when you forget to reset it when you get to brighter light & end up with f stop 13.5 or smaller with diffraction limiting resolution & every spec of dust on the sensor showing up in clear areas.

I shot pictures in the cave in Mammoth Cave National Park, no flash, tripod or monopod allowed, often not even time to stop to take picture, I had no choice but to let in go to ISO 12800 even with the f/2.4 lens.

Dean Sturgis
Forum: Film SLRs and Compact Film Cameras 01-05-2014, 04:15 PM  
Spotmatic Wikipedia Article
Posted By dean45
Replies: 23
Views: 2,896
I haven't used a Pentax Spotmatic much, but have used one with a watch sized silver oxide battery. At least for normal daytime lighting I got slides that look properly exposed.
The battery was smaller than the compartment of the Spotmatic, I used aluminum to take up the extra space. The biggest operation problem was that I was using the battery
in reverse polarity compared to the Hg battery. The needle than moved in opposite direction of the aperture, that slowed me up a little as I adjusted it.

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