First light DS SolarMaXii 60MM
Posted 14 November 2012 - 11:29 AM
Posted 14 November 2012 - 12:07 PM
Are you having problems getting focus because the camera or because the focuser. I've heard that the focuser is very difficult to use.
Posted 14 November 2012 - 12:20 PM
Posted 14 November 2012 - 03:01 PM
On our 90DS, I put the helical about in the center of it's travel, then get a rough focus extending the first tube. For my, that's about 3/4 of the travel for the first tube. Then just fine tune it with the helical.
Posted 14 November 2012 - 07:31 PM
Posted 15 November 2012 - 06:02 AM
When you say you're having trouble with focus, do you mean finding focus or achieving focues (i.e. the scope won't physically focus with the camera)? Is the image above a single frame, or stacked video from Registax? Wavelets applied?
I've been using this method of histogram focusing for all my solar work and find that it's very effective.
Posted 15 November 2012 - 06:03 AM
Ugh...nevermind. I see that one was taken with a DFK21 and you're having problems with a DFK41 (apparently I'm bad at reading, too).
Aren't the cameras physically the same size, save for the chip? I can't imagine why one would focus and one wouldn't.
Posted 15 November 2012 - 11:01 AM
Posted 15 November 2012 - 11:08 AM
Posted 15 November 2012 - 11:26 AM
Because of the size of your sensor I reccomend capturing in .SER using FireCapture software. It is very complete and easy to use.
Posted 15 November 2012 - 04:41 PM
Posted 15 November 2012 - 10:00 PM
But, I'd say that's at least as good as the images that I posted up thread with our DMK51/SMII 90DS. Exposure is dead on showing both surface and limb detail.
Posted 16 November 2012 - 11:31 PM
Posted 22 November 2012 - 05:46 PM
Tony C's mention of the Bayer matrix is more relevant than you may imagine. H-a is square in the red portion of the spectrum and only 25 percent of the pixels are filtered for red. The 50% of the pixels that are filtered for green and the 25% filtered for blue do not contribute to the image.
A DMK 41 series camera has a 1280 X 960 pixel array; if it's a color version, then only 25 percent of the array or 320 X 240 pixels are capturing the H-a image. Compare this to a DMK 21 series mono camera with a 640 X 480 array: the 21 mono has twice the resolution of the 41 color!
This is why mono cameras are preferred for narrowband imaging. I use a DMK 31 mono for H-a and a 41 mono for CaK and am pleased with the results.