Den 2020-10-25 kl. 17:09, skrev Dennis Lee Bieber:
> On Sat, 24 Oct 2020 18:41:25 +0200, Björn Lundin 
> declaimed the following:
>
>>
>> I did not try the moon yet with the HQ camera (cloudy) , but I did with
>> a rpi camera version 2 which I had before - and well - not so good. But
>> images of closer objects - like a powerline 2 km away are good
>>
>  Have you verified that you still have focus movement available when
> trying sky objects? The closer an object is, the more the sensor has to be
> "pulled out" of the tube. Objects at infinity should have the sensor as far
> in the tube as possible.

Yes - focus is good. I hook it up to a tv (shooting from an open window
in a dark room) I can see when I gt in and out of foucs. The stepper
makes the movement _very_ fine, and that is needed. It is difficult to
turn the knob by hand and get it sharp. Hence motorized.

Collimation is good too - printed a tool to help that fitted a laser to
help out.


>  Second -- how long are the exposures?
>
>  If my math is correct, celestial objects "move" ~15 arcsec per second,
> even a 1/4sec exposure well encounter nearly 4 arcsec of movement if you
> don't have an equatorial tracking mount on the telescope.

I do not have tracking - yet. But that is part of whats fun with a pi
(and 3d-printer). I control the elevation but not the azimuth.
And I tried both taking pictures in burst mode, in slower mode,
and filming. I used the film to feed PiPP (amazing thing that finds the
planet and center it in the pictures)
 and then I feed the
output to AutoStakkert .

But hmm, I think I need to try more options in those tools.
I fed it 2 40-50  secs of video but well - it perhaps needs more but
said it was about 1400 pics which gives ca 30 fps which is short. like
33 ms. In that time the planet move from the edge of the screen to the
other edge. and it is small - like 50 by 50 pixels. sizewise it looks
like a tray icon moving.

I lurked a bit on the sites given as suggetions and it looks like my
approach is correct. I perhaps need more patience.

--
Björn







--
Björn

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