View Full Version here: : Solar Imaging
21-04-2012, 05:15 PM
Using my modified Canon 5D with a replacement Baader IR Cut C-MOS filter
and the usual white solar filter in front of the scope and, with my new green Continuum filter if front of the camera I expected to see granulation on the surface of the Sun. Alas, no such thing.
What am I doing wrong I ask myself?
Take no notice of the worm on the top right.
The worm is merely making its way towards a Worm Hole.
21-04-2012, 09:10 PM
What sort of white solar filter are you using, Ken? I have never successfully imaged orange peel with Baader film. I get more with my 1000 Oaks filter.
21-04-2012, 09:47 PM
I am using the foil type Al.
See attachment for my expection of granulation on
Got any tips how to do this?
26-04-2012, 11:56 AM
Your image does not appear to be in focus?
03-05-2012, 10:10 AM
i recall reading at one point that you needed a certain magnification (can't remember the exact figure about 60x or more) to see granulation.
i agree, having a couple of different white light solar filters the baader ones appear to be a tad thicker (meaning less light/contrast/detail comes through them).
also the image looks out of focus.
03-05-2012, 12:42 PM
Hi, thanks for your replies.
Magnification does not come into this because I am using Prime. on my 12 inch Newt. That is, my Canon body is attached in the focuser.
Also the focus in this case is not relevant because , at most, it is out by no more than 1/4 mm.
And lastly, both my filters are from Baader. One visual and the other photographic. They require slightly different 'exposures' because the allow different amount of light through.
Therefor the thickness is not important.
I shall keep you informed after further testing
03-05-2012, 02:51 PM
1) I think you will be hard pressed to see granulation at that image scale. I believe the granules are around 1.5 seconds of arc
2) Seeing during the day will usually stuff your resolving power unless you can capture several thousand images and pick out moments of superb seeing. That is why so many good WL results come from video stacked imaging
3) Focus will stuff up fine details at 1.5 sec of arc
4) Mirror slap will stuff things
My 2 cents worth.
03-05-2012, 04:08 PM
I believe you Ted.
I have yet to do more tests with either a Barlow or and eye pieces as in
eye piece projection.
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