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Comparison of scopes

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#1 Dale17

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Posted 04 January 2020 - 04:01 PM

I am in the market of purchasing a 90mm mak and want to know which one is better optically the Celestron C90, Orion Starmax or the Meade ETX 90.

#2 Augustus

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Posted 04 January 2020 - 04:03 PM

They are all literally the exact same scope nowadays.



#3 ShaulaB

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Posted 04 January 2020 - 04:12 PM

One of the reasons these scopes are at this price point is because of inconsistency. It is a crap shoot if you would receive any one of these with great, good, fair, or poor optics.

 

Good luck.



#4 Dale17

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Posted 04 January 2020 - 04:15 PM

Well there is a older version of the ETX 90 for sale on on here would that be a better bet than newer one?

#5 Augustus

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Posted 04 January 2020 - 04:43 PM

The older ETXes have lots of image shift but the built-in mount is convenient.

 

If you can afford it, I vote for the Questar 3 inch. There is no such thing as a sub standard Questar. I have the Questar 7, and it just does not get any better than that. IMHO.

 

Dan

The Questar is the single most overrated telescope in existence. Mine performed identically to every C90, ETX and Orion 90mm I've ever had.



#6 Aaron_tragle

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Posted 04 January 2020 - 04:46 PM

If you can afford it, I vote for the Questar 3 inch. There is no such thing as a sub standard Questar. I have the Questar 7, and it just does not get any better than that. IMHO.

 

Dan

I think the point of him looking for a 90mm mak was to get a relatively cheap grab n' go that can take quite the beating, the questar is 3000 dollars minimum and owners of it treat the scope better than their own babies.


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#7 Barlowbill

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Posted 04 January 2020 - 04:47 PM

Augustus answered your 3:01 post.  They are all made at the same factory.  It is a dice throw.  Pay your money and take your chances.  I have an older ETX 90 and think it is fine for what it is.



#8 Dale17

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Posted 04 January 2020 - 04:51 PM

Ok thanks for the info but can you tell me if your old etx 90 is multicoated or fully multicoated

#9 Barlowbill

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Posted 04 January 2020 - 05:00 PM

In reviewing the manual, it only states the correcting lens is "BK7 optical glass, Grade-A".  



#10 Dale17

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Posted 04 January 2020 - 05:10 PM

Ok thanks for the info I did find one on ebay and it said multicoated. So I am just going to go with that info. You also said all the new 90mm maks are made at the same place but I am sure your older ETX was not right?

#11 Dale17

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Posted 04 January 2020 - 05:28 PM

It really doesn't matter to me which scope I get it's more about the coating on the front lens. The Celestron C90 is multicoated so is the Orion Skymax but I am not sure what the older ETX is the New ETX is UHC coated and the Skywatcher is fully multicoated. I would love the newer ETX or the skywatcher but I just want the ota I dont want the mount or stand. And that's how they sell those thats why I was looking at the celestron c90, Orion Skymax and the older ETX 90 because you can get them with out the mount and stand.

#12 Augustus

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Posted 04 January 2020 - 05:29 PM

It really doesn't matter to me which scope I get it's more about the coating on the front lens. The Celestron C90 is multicoated so is the Orion Skymax but I am not sure what the older ETX is the New ETX is UHC coated and the Skywatcher is fully multicoated. I would love the newer ETX or the skywatcher but I just want the ota I dont want the mount or stand. And that's how they sell those thats why I was looking at the celestron c90, Orion Skymax and the older ETX 90 because you can get them with out the mount and stand.

It literally does not matter. They are all the same, fully multicoated, even if the manufacturers don't say it. Even if they weren't it wouldn't actually matter in practice anyway.



#13 Dale17

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Posted 04 January 2020 - 05:38 PM

Oh ok good to know then I will go purchase a brand new celestron c90 they have good price on Amazon for it.
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#14 Jaimo!

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Posted 05 January 2020 - 11:32 PM

If you are interested in the Celestron C90  (click the link) it is an amazing resource and filled with information for this scope.

 

Jaimo!



#15 photoracer18

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Posted 08 January 2020 - 03:54 PM

I used to work for a Celestron/Meade dealer and I don't have either one old or new. I have a LOMO Astele 95 Mak instead. It has a number of mechanical and optical advantages over the C/M ones.

1. Full size SCT visual back so does not need an LAR adapter to get that big when it has such a small hole in the back. No hokey flip mirror also like the Meades and current Celestrons.

2. Micrometer focus adjuster so little or no image shift.

3. Rumak Cassegrain at F12.6. Which means SCT focal reducers can work pretty well.

4. Russian optics from the company that Maksutov actually worked for.

5. No plastic in the tube or mechanicals. Even the little 5x24 finder is all metal.

6. All metal screw-on dewshield (if you can find one, pretty rare).

7. These things are known to be able to see .30" bullet holes in paper at 1000 yards. Normally takes a high end 80+ mm spotting scope like Pentax, Zeiss or Swarovski to see that.

8. Only available used now, around $250 or so.

 

I don't remember how many we sold but the last 4-5 we had were scooped up by a bunch of long range shooters once they tested one out. I had to buy mine from a former customer off CL. 


Edited by photoracer18, 08 January 2020 - 04:08 PM.

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#16 Peter Besenbruch

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Posted 08 January 2020 - 11:27 PM

3. Rumak Cassegrain at F12.6. Which means SCT focal reducers can work pretty well.

I use an f.63 reducer with my C90 (actually, the Orion version). It works very well.



#17 grif 678

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Posted 09 January 2020 - 12:11 PM

I have tried the C-90 orange tube ( 5 of them ) the newer C-90's ( 3 of them ) and if you can find one of the Meade ETX with the USA optics, it will blow away the others. I have one of those on a unitron 114 altaz mount, and that will be the last scope (if ever ) that I let go. You can find one in the $100 price range (OTA) 




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