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Equipment Discussions >> Video and Electronically Assisted Astronomy

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scout72
Pooh-Bah
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Reged: 05/12/08

Loc: SF Bay Area
Little help from the solar video experts? new
      #5656477 - 02/01/13 02:30 PM Attachment (18 downloads)

I have only dabbled in solar video in the past but getting more interested and thinking about picking up an H/A scope to use with the HD security cam I have - but wanting to do a bit more in white light if I can- the problem i have is that with the setting I use I always get this funky crosshatch pattern in my video and they are correctly exposed as far as I can tell- I am attaching an example- this was with st120 scope, shc-745 camer (1/2 chip) with the stock optical low pass filter in place and orion solar filter(film).

Excuse the poor quality of the image- it is a screen grab from a poor quality video to begin with- wasn't planning on recording it. - just using to show the pattern.

I was not using a reducer and no other filters.

Setting were 1/500, gain off, boosted a bit in amcap.


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GlennLeDrew
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Little help from the solar video experts? new [Re: scout72]
      #5658147 - 02/02/13 01:24 PM

Interesting that the pattern is localized exactly to the brighter central part of the solar disk. What happens when you reduce the exposure?

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ccs_hello
Postmaster
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Reged: 07/03/04

Re: Little help from the solar video experts? [Re: scout72]
      #5658205 - 02/02/13 01:51 PM

Brian,

Suggest you put in a ND filter to reduce any chance of glaring or internal reflection. Extremely short exposure is using electronic shutter which may not work well all the time.

In your case, try to under-exposure on your type-1/2" Exview NTSC camera.
Then capture in 720x480 mode (do not scale to 1280x1024) and post a picture in its native resolution please.

Clear Skies!

ccs_hello


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