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What is the best scope for AP < $1k?

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#1 chanrobi

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Posted 18 April 2021 - 11:13 AM

Couple of requirements:

 

1) Has to be able to attach to my dslr (eos m)

2) Focal length 400-600mm

3) Cannot be slow (f/5 or faster) <- Is this possible? necessary?

4) Can have a ... extender put on? <- Is this possible?

 

I've been shooting for the last year with a 135mm f/2 lens and this is just way too wide for most of the stuff I want to do. I've looked at scopes like

 

- redcat, radian raptor (not enough FL)

- ES AR102 F/6.5 (inside budget but seems slow?)

 

I have very limited time most nights to go out and shoot, so i'd like to get the most data possible for that time (= need fast scope?). Or would aperture trump that?

 

Suggestions?



#2 Normmalin

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Posted 18 April 2021 - 11:22 AM

I'll just answer from a spec perspective.  Can't talk to quality comparisons between scopes you mention.

 

Williams Optics Zenithstar 73 is a 430mm (f/5.9) but with field flattener/0.8x focal reducer gets you to 344mm (f/4.7).  The total cost of the scope plus flattener/reducer is $1k.


Edited by Normmalin, 18 April 2021 - 11:23 AM.


#3 dswtan

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Posted 18 April 2021 - 11:25 AM

What mount do you have? If you're talking about DSO astrophotography, you'll be best to budget your 1k on the mount and get a cheap refractor to put on it to upgrade from a 135mm camera lens.

 

Best forum then for this question would be https://www.cloudyni...ep-sky-imaging/ .



#4 alan.dang

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Posted 18 April 2021 - 11:32 AM

Canon EF 400/5.6L
Air spaced 72mm triplet with flattener.

#5 Lead_Weight

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Posted 18 April 2021 - 11:35 AM

Askar FRA400 or FRA600. Quadruplet with full frame flat field. Both have reducers to give you even wider view and faster speed as an option.



#6 chanrobi

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Posted 18 April 2021 - 11:56 AM

What mount do you have? If you're talking about DSO astrophotography, you'll be best to budget your 1k on the mount and get a cheap refractor to put on it to upgrade from a 135mm camera lens.

 

Best forum then for this question would be https://www.cloudyni...ep-sky-imaging/ .

I'm not concerned about the mount at the moment, need suggestions just for scope




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