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Question about buying my next telescope

astrophotography equipment reflector refractor SCT
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5 replies to this topic

#1 Ebrahem

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Posted 06 August 2020 - 03:08 AM

Hello everyone.

I spent 2 years with explore scientific ed80 (mounted on AVX) with ASI 294 mc pro.

Now ordered ASI183mm pro with Narrowband filters.

I want more reach for astrophotography mainly (galaxies and other small DSO).

Please any advice regarding buying my next telescope.

Explore Scientific 127 (FCD100orFCD1?)

Explore Scientific 102mm f/7 Triplet(FCD100orFCD1?)


Meade 6000 Series 115 ED f/5.7 Triplet

iOptron Versa 108 ED Apochromatic

Celestron Edge HD 8 inch with 0.7 reducer



Thanks.

#2 Cbaxter

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Posted 06 August 2020 - 03:35 AM

Hello,

The ES127 is very heavy for an AVX mount. My first AP mount was an AVX and I still use it for light portable payloads. I have used the ES127 on the AVX with autoguiding, results were frustration and unusable subs. If you want reach for planetary nebula and small galaxies I recommend something light like a C6 SCT or possibly an C8 SCT. I have used a C8 with a reducer on the AVX numerous times but never was able to achieve acceptable results. However, I have only ever tried a dedicated guide scope. It may be possible (based on research) to achieve subjectively acceptable results using an off axis guider with a long focal length scope on the AVX. Keep in mind though, that the AVX has a fairly low payload weight limit, and for decent performance your entire payload will need to be about half of the rated max mount payload.

Regards.
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#3 Ebrahem

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Posted 06 August 2020 - 06:39 AM

Thanks.

What about the other scopes?
Do you think they are good as a next step (after ed80)

#4 bobhen

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Posted 06 August 2020 - 06:55 AM

For small objects like galaxies you want image scale (focal length) so you should consider an SCT. 

 

Bob



#5 Cbaxter

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Posted 06 August 2020 - 07:39 AM

Thanks.

What about the other scopes?
Do you think they are good as a next step (after ed80)


With the AVX mount's weight limit I would recommend looking at light weight kits, 15 pounds total (half of the AVX rated max limit), including scope, rings, dovetail, guide scope/camera, and imaging camera. The reality is that the AVX mount does not track nor autoguid well enough to support very long focal lengths. Honestly, no matter what I did to my AVX mount I never felt that it was ever accurate enough (with autoguiding and a sub 1 arc minute polar alignment) to support long exposures for focal lengths longer than 600mm. Anyway, that is my experience.

Regards.

#6 Ebrahem

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Posted 06 August 2020 - 12:45 PM

Yes I see that.
skywatcher eq6-r pro will be my next mount soon.
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