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Guiding thru telescope with one camera

3 months 2 weeks ago
Astrosnoesky
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Guiding thru telescope with one camera #54945
Hi all,

Is it possible to guide with the same camera as the one used to make the images at the same time?

Mount: AZ EQ 6GT
Telescope: Newton 10' f4, Esprit 100ED, Celestron 8SE
Camera: Zwo 120MC, 294 MC Pro

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3 months 2 weeks ago
wvreeven
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Guiding thru telescope with one camera #54948
If your camera can both take long exposures for imaging and short exposures for guiding then it is possible. To my knowledge no such camera exists though. You should be able to get good images by stacking LOTS (I mean hundreds) of 2, 3 or 4 sec exposures such that those exposures are used for guiding at the same time but then you'd probably lose a lot of SNR because most cameras work best at longer exposures. So in general I'd say that it is not possible or at least strongly not advisable.

ASI6200 and filter wheel with a SkyWatcher Esprit 80 ED on a SkyWatcher HEQ5-Pro
ASI1600MM-Pro Cooled and filter wheel with an 8" TS Ritchey-Chrétien on a SkyWatcher EQ6-R

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3 months 2 weeks ago
Astrosnoesky
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Guiding thru telescope with one camera #54949
i know what you mean. The error may be an error occuring every 10 sec. Your sub is still being shot (eq. 60 sec subs) and so you miss the error.

Mount: AZ EQ 6GT
Telescope: Newton 10' f4, Esprit 100ED, Celestron 8SE
Camera: Zwo 120MC, 294 MC Pro

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3 months 2 weeks ago
Bart
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Guiding thru telescope with one camera #54983
It is possible if you have a camera with non-destructive readout.
We don't have that.


Think of it like this: If you have short enough exposure times that you - can- guide with your imaging camera, you -don't have to-, because the tracking error would be negligible in that case.

Best is to simply get a guide scope or off-axis guiding. Personally, I prefer a separate, light weight guide scope, because it's more light sensitive and it prevents issues with vignetting on the imaging camera. Also I already have a lot of weight on the focuser.

15 cm wavefront condensor | Earth rotation undo-er | Few photon discriminator plates | Photons to electrons transmogrifier | Stellarmate

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3 months 2 weeks ago
El Corazon
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Guiding thru telescope with one camera #54984

Bart wrote: It is possible if you have a camera with non-destructive readout.
We don't have that.


Think of it like this: If you have short enough exposure times that you - can- guide with your imaging camera, you -don't have to-, because the tracking error would be negligible in that case.

Best is to simply get a guide scope or off-axis guiding. Personally, I prefer a separate, light weight guide scope, because it's more light sensitive and it prevents issues with vignetting on the imaging camera. Also I already have a lot of weight on the focuser.


Agree, and the only reason to have an OAG is to take advantage of the higher power of the imaging scope and to avoid flexure. If you can control flexure, the first problem is not so much a problem anyway, since seeing changes are usually larger than the resolution of a 280 mm guide scope. I.e. if I get an RMS of 0.7, and seeing limits resolution to 2.5 arcsec/pixel, any 10% gain or so by using an OAG will be negligible.

Atlas Pro AZ-EQ, ASI1600MM-Pro, ASI120MM-S, ES102ED, WO-Z61, Nikon D3300, ASI-EFW, ZWO LRGB,Ha,O3,S2 filter set

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3 months 2 weeks ago
Ihoujin
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Guiding thru telescope with one camera #54989
There are very high end cameras that contain a guide sensor above the main image sensor. But that's really just a glorified Off Axis Guider.
So the answer unfortunately is No.

INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.

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3 months 2 weeks ago
ChrisRowland
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Guiding thru telescope with one camera #54993
One attempt to do this was a camera with an interline sensor which would read the camera data in two separate passes, one for the odd lines and one for the even lines. I don't think it really caught on because of the obvious problem that the image resolution was halved in the line direction. Amplifier glow would have been another problem, you can't turn that off if you are still reading the camera.

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