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Old 31-12-2018, 12:13 PM
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Astrofriend (Lars)
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Join Date: Aug 2017
Location: Stockholm, Sweden
Posts: 175
Hi,
I don't have very long focallength, 910 mm refractor as main telescope. To that I use an telephoto lens with 400 mm fl as guide telescope. The main camera is a Canon 6D fullframe. The guide camera is a qhy5, just a bit smaller pixels compare to main camera. Works well and I have not noted any flex between the tubes.

See here how it's setup:
http://www.astrofriend.eu/astronomy/...flattener.html

Earlier I had off-axis guiding, if get in trouble with the new setup I build a new off-axis system to the new 3" field flattener. But it will cost a lot of money so good if I don't have to.

One advantage with a separate guide telescope is that I can have a wider field and then easier to find guide stars.

Lars
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