Quote:
Originally Posted by cventer
"Focus was sustained, with no change, till the last frame came in at 04:02 in the morning. The temperature change during this 10 hour stretch was ~ 14 C degrees (from ~ +12 C down to ~ -2 C)."
I have to say I am somewhat skeptical of this claim. Bert another Rh200 user on this forum has gone to great lengths to control the temperature of his scope. Keeping an f3 optical system in focus over a 14 degree temperature shift would be a spectacular design and engineering feat. If the design does allow this then kudos, other manufacturers like takahashi and AP have got a lot to learn.
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Cris I keep the whole image train at a constant temperature. I have found that the focuser and CFW are more prone to temperature changes than the RH200. It is impossible to keep the Atlas focuser and CFW at a constant temperature without also controlling the RH200 temperature. I am still in the process of tweaking this.
Just for interests sake on that really hot night when the whole optic train was at 29C rather than the set 20C. Focus had shifted by 1100 steps of the Atlas focuser. This is about 93 micron and nearly all of it was in the optic train behind the RH200. I have temperature sensors all over the place and when the RH200 was still at 28C due to the high tech towel and the Atlas focuser/CFW was close to 21C focus was almost back to what it was at 20C!
Bert