Thanks Gabriel for clarification.
You indicate your unguided precision is "0.08 arc seconds per axis per second".
In the last session I did to improve my ratio, I measured initially a 0.05 arc seconds per second in az and 0.32 arc seconds per second in alt.?
I have then calculated at home the correction factor and the new ratio in alt and az have been put in servocat but bad weather then.
I will check next time I have good weather at observatory what are my new az and alt precision. But I will certainly be globally not that far from you on precision.
I then have some questions :
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* I see wonderfull pictures taken with alt/az scopes here. Are these pictures taken using the autoguiding method ? Or with unguided scopes ? In the latter case what is your precision of these unguided scope in arc sec/ sec ??
Because I wonder if, as a newbie in astrophoto, autoguiding is necessary or not...
If I read correctly your initial message Gabriel, I understand that you have improved precision of guiding by a factor 2 when using the autoguiding method (from 2-2.5 arc" to 1.3 arc " for your exposure time of <13"). It this improvment necessary for a newbie ?
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* I have a 10" (f=1150 mm) scope in // of the 36" (f=3150 mm). This could be used for autoguiding, no ?
The only potential problem is that the parallellism of the 2 scope may vary a little bit when I change location in the sky because the 10" is fixed by its back on a plate (with adjustment screw at back of the plate to parallelize the 10"), and I believe a little bit of flexion occurs certainly. Not a big deal in visual, but in astrophoto I don't know...
Maybe on a given zone of the sky it will not change its flexion for a total 30 min posing? I don't know...
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Thnaks for your feedback
Rapha?l
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