4 replies to this topic

[AbdullahMhd]

Hello everyone,

I recently got the SW SA GTi for astrophotography and would like to upgrade to a telescope. I have been considering the AT72EDii but I am a little worried about it pushing the GTi tracking capability.

I will be using it with guiding and the total weight will be below 3.7 KG.

Please let me know, preferably from experience, if I can get good subs with this setup. 


Thanks.

[LPHawaii]

4.98952 kg is the max weight this mount would support.  Divide this number by 2 to get the recommended weight for tracking...2.49476.  3.7 kg is too heavy per SW specs: https://www.skywatch...-mount-head-kit

[prookyon]

I believe the general consensus of many such previous threads has been that for SA GTI this dividing by 2 is not neccessary.

I am running it with a payload that exceeds 4kg.

[AbdullahMhd]

I believe the general consensus of many such previous threads has been that for SA GTI this dividing by 2 is not neccessary.
I am running it with a payload that exceeds 4kg.

Are you guiding? And how long are your subs reaching?

[prookyon]

Are you guiding? And how long are your subs reaching?

Yes, I am guiding.

I don't think length of subs is a meaningful metric. I don't see a difference between 1 and 3 minute subs. Also I'm in ~ Bortle 8 and don't have narrowband filters with extremely narrow bandpass so there is no practical need to ever use longer subs.

My guiding is on best of days ~0.9" RMS, usually between 1-2" RMS. This requires careful balancing and playing around in PHD2 to find what parameters work best.