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by blackketter
Mon Mar 07, 2016 4:41 pm
Forum: General discussion
Topic: Max resolution?
Replies: 19
Views: 53697

Re: Max resolution?

I'm specifically looking to drive a 2560x1440 display at any frequency. Would 2560x1600 be close enough for you? That's been available for a loooooooong time... http://elinux.org/RPiconfig#Video_mode_options Thanks! I'll have to try it. It's surprising that WQHD isn't a supported resolution. Also s...
by blackketter
Mon Mar 07, 2016 3:49 pm
Forum: General discussion
Topic: Max resolution?
Replies: 19
Views: 53697

Re: Max resolution?

Time to resurrect this thread... :)

Has the resolution limit been changed in Raspberry Pi 3?

I'm specifically looking to drive a 2560x1440 display at any frequency.
by blackketter
Sat Feb 14, 2015 9:10 pm
Forum: Camera board
Topic: Images progressively blurry as the day goes on
Replies: 22
Views: 3794

Re: Images progressively blurry as the day goes on

How much is the temp in your room varying during the day? A lot. It's a south-facing window. At night it probably gets down to around 10C. Just broke out the cooking probe thermometer. Wow. The temperature at the lens is around 59C right now, which is probably the peak. So, yeah, probably around a ...
by blackketter
Sat Feb 14, 2015 7:09 pm
Forum: Camera board
Topic: Images progressively blurry as the day goes on
Replies: 22
Views: 3794

Re: Images progressively blurry as the day goes on

Wow, thanks for the help everybody! - Pressing on the warm lens doesn't affect focus, I can't get it to move appreciably. So I don't think it's the adhesive/gasket. - Refocusing the lens while warm brings it back into focus. It goes out of focus when it cools down. This implies that it's the lens as...
by blackketter
Sat Feb 14, 2015 5:59 pm
Forum: Camera board
Topic: Images progressively blurry as the day goes on
Replies: 22
Views: 3794

Re: Images progressively blurry as the day goes on

Ok, quick test verifies that heat is an issue. Below are hot and cold pictures, after heating another camera module a bit with a hot rework station (set to max 100C, though I don't think it got that hot), then letting it cool for a minute: https://dl.dropboxusercontent.com/u/46266871/web/hot.jpg htt...
by blackketter
Sat Feb 14, 2015 5:19 pm
Forum: Camera board
Topic: Images progressively blurry as the day goes on
Replies: 22
Views: 3794

Re: Images progressively blurry as the day goes on

I think the lens-sensor distance difference between sharp focus and not-sharp on this camera is measured in microns. So I think thermal expansion as ambient temperature changes could do it. Aha. That makes sense. I'll get out my heat gun and do a little bit of (gentle) experimenting. Maybe I need a...
by blackketter
Sat Feb 14, 2015 5:07 pm
Forum: Camera board
Topic: Images progressively blurry as the day goes on
Replies: 22
Views: 3794

Re: Images progressively blurry as the day goes on

The most noticable difference between those images is change in contrast. In the 'blurry' one the dark areas are not very dark. Could it be light on the window or lens as the sun moves? If you right-click on those images and see them in full resolution, you can see that the focus has changed substa...
by blackketter
Fri Feb 13, 2015 11:08 pm
Forum: Camera board
Topic: Images progressively blurry as the day goes on
Replies: 22
Views: 3794

Images progressively blurry as the day goes on

I'm working on a long-term time lapse project with a B+ and camera board and I'm seeing some strange blurriness in the images as the day gets brighter. Here are two examples, taken at 10am and 11am this morning. The raspistill parameters were exactly the same: https://dl.dropboxusercontent.com/u/462...

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