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Old 14-09-2019, 02:17 PM
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gregbradley
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There are Petsval camera lenses around. Just not a lot.

Greg.
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  #42  
Old 14-09-2019, 03:58 PM
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Peter Ward
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Quote:
Originally Posted by Nikolas View Post
$1500?????? passss..........
With the $A falling off a cliff at the time, that was just a ball-park number.

The pacific peso has improved. $A1365 inc GST
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  #43  
Old 22-05-2021, 08:59 AM
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Astrofriend (Lars)
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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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