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Old 22-05-2021, 08:59 AM
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Astrofriend (Lars)
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Join Date: Aug 2017
Location: Stockholm, Sweden
Posts: 341
It ended up with a medium format lens, the Pentax 645 300 mm ED f/4 lens. First I tried the Canon 300 mm L f/4. It was sharp but too heavy vignetting, that's the reason I switch over to the medium format lens.

One test shot from light polluted area (Bortle class 9):

http://www.astrofriend.eu/astronomy/...n-cluster.html

It works fine with USB-focuser motor too. Control it from a Raspberry computer. I also bought a new mount, the HEQ5 mount, save some kilograms with that one.

In october when we get a dark sky agian I have to find a good battery to the equipment, maybe a 20Ah LiFePO4 battery, have no experience from that kind of battery yet. It must last for 10 hours at least. The equipment take 1.5 Amp at 12 volt.

/Lars
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