Quote:
Originally Posted by Paul Haese
I had to use a powermate 2.5X which reduces the image scale the further away you move the sensor. Bear in mind though that the image will get dimmer too.
I found that cameras with pixel sizes of 5um or thereabouts worked best with an SCT. Using a camera with smaller pixels and in particular very small can provide problems for you.
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the rule of thumb shows that the optimum for the ZWO is f19 (= 3.75*5). Looks like you are using the 2.5 Powermate at about 2x to provide about f20 - so that's another validation for the rule
. Minor point, but surely the image will get brighter as you move away from the 2.5 Powermate?
Interested in your comments on small pixels - what problems have you found?