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Old 12-03-2016, 03:21 PM
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billdan (Bill)
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Join Date: Mar 2012
Location: Narangba, SE QLD
Posts: 1,551
Hi there Perseus,

Welcome to IIS, A Goto DOB is fantastic for viewing but for astro-photography there are some issues to overcome first.

The first issue you may encounter is the focus position has been optimised for eyepieces. So this may entail minor modifications to the OTA to achieve focus with a camera. i.e moving the primary mirror closer to the secondary and depending on your camera could be over an inch.

The next issue is field rotation, the DOB is on an Alt/Az mount and this means you will be limited to planetary photographs and short exposures on DSO's, max about 30sec's depending on the part of the sky you are looking at.

If you are serious and want to go longer in exposures you will have to buy a De-rotator which are not cheap $1500 - $2K. Also some way of guiding the DOB precisely.

For a first time telescope it's great choice.

Cheers
Bill
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