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Hi Ving
A bit of a ramble follows.
I have used the Meade LPI (16 second maximum) to image some double stars. However, to capture those with a smaller separation angle, you need to start using Barlow’s, thus getting into multi-second exposures, which are problematic in bad seeing. Also, anything over 3 or 4 seconds with the LPI produced quite a few hot pixels, which appear as red, blue or green noise specks in the image.
The best results I have had are with my SBIG ST7E which is cooled, but obviously completely out of the question for what you want due to cost.
I have also used the Orion Star Shoot Deep Space Imager, but at $579 from Sirius Optics that too is also expensive.
Good luck with the project, it sounds fun...and challenging.
Cheers
Dennis
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