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Old 24-03-2018, 11:42 AM
SuperG
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Imaging with PST

I just got my PST last weekend and I have an ASI120MM for imaging. What is the best way to get a wider FOV. Ideally, I'd like to get a full disk image. Will a focal reducer work as a cam with a larger chip size will be too expensive at this time. Any hints and tips with imaging with this thing?

thanks
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  #2  
Old 24-03-2018, 12:56 PM
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Merlin66 (Ken)
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Welcome to the world of Ha....
The chip size of the ASI 120 is 3.6 x 4.8mm - just too small to give full disk coverage with the 400mm fl PST.
Due to the limited backfocus (The PST was designed as a visual instrument) it's well neigh impossible to accommodate a reducer.
Unfortunately the only viable option is to use a camera with a larger chip, or practise preparing mosaics......
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Old 25-03-2018, 09:19 AM
SuperG
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Thanks. I thought so. Its going to take a long long time so get an ASI174MM; or is there a cheaper camera?
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Old 25-03-2018, 09:27 AM
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Merlin66 (Ken)
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The ASI 174 (although I use one..) is not a good fit for a 400mm focal length scope. Smaller pixels would be better. That's basically why I went for a ASI 183MM.
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Old 25-03-2018, 11:54 AM
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Atmos (Colin)
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With the PST you will have to change the way you attach the camera. I could focus with a QHY5L but not with the ASI120 due to shape; the ASI120 just cannot get the chip close enough to achieve focus without modifying the 1.25” nosepiece on the PST. The QHY5L is 1.25” diameter so it just slides in.
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