VCurve - what affects it?

Voyager Autofocus & Robofire
1

Hi astro-friend,

We’ve had quite a few days with excellent weather here in Switzerland.

Yesterday, I wanted to add an additional V-Curve and I was a bit disappointed with the outcome; each time, I had one side of the curve “very good” and the other one not really.

What might be the main reason of that ? Seeing ? Backlash ? etc. ?

FYI, I did run some test with different star and had similar outcomes. Worth mentioning that usually I am getting very nice V-Curve.

Thanks for your kind support.

Regards,
Aygen

2

Hi Aygen,

If you don’t need it, don’t add Curves. The number of vcurves depends on their repeatability and on the resolution of the system.

The causes for what you indicate are usually:

  • focuser slippage or unscrew for temperature extreme change or loosening
  • backlash
  • cables retains not free to move
  • sensor not squared , threads not thighten
  • uncollimated instruments (intrafocal different from extrafocal)

Not seeing … seeing affect all !
Remove the last vcurve from the list, the one done in this message.

All the best
Leonardo

1 Like
3

Thank you, Leo, fo your swift input !

Make sense, will do as suggested.

All the best,
Aygen

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