@GaryI wrote:
I have a Tak-85 scope and focusing is very critical, so I added an automatic focuser so I could implement SGP to help me keep focus. SGP has been working very well with my system overall. But I noticed that, for slower temperature drops, the focuser wasn't changing at all. Upon quering the logs, it appears that SGP is basing the temperature compensation simply on the temperature delta during the previous frame (not since the last step change). So if the temperature delta results in a focuser change of 0.5 steps or less, it simply ignores it and moves on. This is an issue for a scope like mine which has a few number of steps per degree of temperature change. When I am imaging for an hour or more with subs of one minute each, the scope may need a 0.3 step change after each frame, but since each delta rounds to zero, there ends up being no compensation and the scope ends up being 18 steps off in an hour.
Is there some kind of workaround for this issue? If not, this seems like a simple fix for the next release. The program just has to measure the delta from the last step change.
Gary Imm
Onalaska, TX
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