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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 21 Sep 2011 (Wednesday) 17:43
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What can I shoot with this telescope? Sky-Watcher Startravel-102 SynScan AZ GOTO

 
Atomsmurf
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Sep 21, 2011 17:43 |  #1

Hi folks,

I am considering buying this scope in a few days from a local (Norwegian) retailer:

Sky-Watcher Startravel-102 SynScan AZ GOTO

http://www.opticstar.c​om …atcher.asp?p=0_​10_1_3_105 (external link)

What can I shoot with this thing? I am a bit worried the tripod is too light for the scope and my Canon T2i/550D w/battery grip and remote control.

Can I do any serious tracking with this thing? Can I do long exposure (<2 min) without experiencing any drifting? Grateful for any advice.

Stig,


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ohata0
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Sep 21, 2011 17:53 |  #2

AZ means alt-azimuth...which basically means "normal tripod".
It will technically track by keeping following the object, but that's sort of tracking is mostly for visual viewing.

You can't do any real tracking w/ it because everything will still rotate. You'd need an EQ (equatorial) mount to do tracking properly.




  
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Atomsmurf
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Sep 21, 2011 18:13 |  #3

ohata0 wrote in post #13141385 (external link)
AZ means alt-azimuth...which basically means "normal tripod".
It will technically track by keeping following the object, but that's sort of tracking is mostly for visual viewing.

You can't do any real tracking w/ it because everything will still rotate. You'd need an EQ (equatorial) mount to do tracking properly.

Tnx for your answer. So is it useless for astrophotography? I am thinking (with no prior experience) that for instance software like DSS will auto correct the rotation of the subject in post? Or is it not possible?

Stig,


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ohata0
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Sep 22, 2011 00:57 |  #4

I think it may be ok for short exposures...as you said, most software will handle rotation when stacking. I think there may be a problem w/ long exposures though.

Tracking would follow your subject, probably keeping it centered. Depending on what you're tracking, you may see rotation at the outer edge of view. If the exposure is long enough, you could get trails from the rotation.

I guess I should probably add that I don't have any actual experience w/ astrophotography and telescopes/mounts. I only have a tripod to use right now. Maybe eventually, I'll try building a motorized barn door tracker or something.

Hopefully others can chip in and give their advice.




  
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spit
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Sep 22, 2011 05:59 |  #5

basically lunar shots, DSS cant make auto correction because youll have a field rotation, meaning you wont have good subs with long exposure




  
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Atomsmurf
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Sep 22, 2011 06:36 |  #6

spit wrote in post #13144028 (external link)
basically lunar shots, DSS cant make auto correction because youll have a field rotation, meaning you wont have good subs with long exposure

Ofcourse, I see. Well back to browsing the catalogue I guess :)

Tnx all


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spit
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Sep 22, 2011 10:01 |  #7

just look for an EQ-- when an alt/az tracks, it tracks on both axis to keep the target in the FOV, naturally the stars will end up zig-zags as the scope tracks, and EQ mount follows the sky in RA- which is what you want




  
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martyn_bannister
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Sep 26, 2011 04:04 |  #8

Don't know if it's possible to use a wedge, like THIS (external link), with the SynScan??? This would prevent field rotation???




  
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neodom34
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Sep 30, 2011 07:01 |  #9

no it is not possible to use a wedge with the Synscan AZ GOTO as the hand control lacks software control for polar alignment and tracking (and there is no way to upgrade it).
At that level, it is better to go for either meade or celestron mounts which, in theory (as you have to built the wedge yourself), allow to do tracking in both EQ and AZ modes.




  
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martyn_bannister
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Sep 30, 2011 11:16 |  #10

neodom34 wrote in post #13186370 (external link)
no it is not possible to use a wedge with the Synscan AZ GOTO as the hand control lacks software control for polar alignment and tracking (and there is no way to upgrade it).
At that level, it is better to go for either meade or celestron mounts which, in theory (as you have to built the wedge yourself), allow to do tracking in both EQ and AZ modes.

Very useful info. THanks for that.




  
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chris.bailey
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Oct 05, 2011 07:23 |  #11

Just to add a different perspective yes you can do long exposures in ALT-AZ but only to a point. I used to use my LX200 in Alt-Az and provided you pick targets away from the pole (where field rotation is fastest) you can get 20-30 second exposures. Wont cut the mustard with very faint objects but you would be surprised at what you can image quite successfully by stacking a whole load of these in DSS.




  
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harbinjer
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Oct 06, 2011 10:04 as a reply to  @ chris.bailey's post |  #12

The scope will also show significant Chromatic aberration as it is f/5 and just an achromat (apochromats will do much better). It might be fun for observing if you're new to this, but if you're serious about imaging, I would consider a heavy duty equatorial mount. I don't know if you can even lock the focus with this scope, which would be important.




  
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What can I shoot with this telescope? Sky-Watcher Startravel-102 SynScan AZ GOTO
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