20080308 Sun

I was too slow to catch AR984 before it disappeared from the western limb. The whole solar disc becomes boring again with a few small prominences around. Seeing 4/10, transparency 5/10.

Telescope: Borg 45ED II, NGF-S as usual but without extension tube for a 0.5x binoviewer corrector is attached to the DMK nosepiece via a small extension tube

Camera: DMK 31AF03

Filter: Solarmax 40 with BF10

I added the reducer to test under lower image scale, to see if the sweat spot issue can be reduced or not. And it also helps me to see if I can get a full disc sun in a single shot with my coming DMK 21AU04. So given this purpose, I digged out my DBK 21AF04 to try as well, for it has the same chip size.

1323 (GMT+8), seems like the reducer lens is not in good collimation:-


1324 (GMT+8), again, not as sharp as it should be:-


The following two are taken with a DBK 21AF04:-

1330 (GMT+8), notice that the Bayer matrix is killing the resolution:-


1331 (GMT+8), signal leakage causing the strange coloration of the solar disc:-