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Thanks for links John and Ken. For now I masked filter slot with black insulation tape. I want to see first how much of focus travel I will get before I change distance of nosepiece from the CCD chip. I have run camera for 5 hours and measured heatsink temperature. It is 6.2 degrees above ambient. So heatsink cooling is quite good, but adding the cooling fan as Ken suggested should brink it down closer to ambient temperature. Of course Peltier will work like charm. Pity about need to grind heatsink fins. Even after that, heatsink surface needs to be machined flat as there is a curve on it.
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