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Your favorite 90mm Mak?

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115 replies to this topic

#1 mayhem13

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Posted 09 March 2021 - 01:56 PM

Quite a few options out there from every mfgr in this class but I’m looking for the best optics for Lunar AP. I think it’s safe to say we can cross Questar off the the list as it’s just waaaaay to expensive. Was thinking Vixen might be a quality scope but user reviews report very soft images and focus.....what’s your experience and thoughts on these gems!



#2 rob1986

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Posted 09 March 2021 - 02:04 PM

Quite a few options out there from every mfgr in this class but I’m looking for the best optics for Lunar AP. I think it’s safe to say we can cross Questar off the the list as it’s just waaaaay to expensive. Was thinking Vixen might be a quality scope but user reviews report very soft images and focus.....what’s your experience and thoughts on these gems!


origional meade etx 90s were very very good. I think rod molise writes that the optics themselves are hardly distinguishable from questar (to his eyes). (everything else is anothet matter)

haven't used one for a while, but as memory serves the optics were great
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#3 Barlowbill

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Posted 09 March 2021 - 02:12 PM

My best is the only one I have.  I go with Uncle Rod.  Mine is an older ETX 90.  I call it my Moon Killer.  But then, I don't know much!


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#4 Maritime

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Posted 09 March 2021 - 02:38 PM

What about the Celestron 4se?



#5 Toddeo

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Posted 09 March 2021 - 03:05 PM

What about the Celestron 4se?

The 4se is a 4" scope.



#6 DHurst

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Posted 09 March 2021 - 04:32 PM

I picked up a c90 with backpack, and 32mm plossl from A_______n for $178 a few months ago.  Put sandpaper flocking into the baffle, and it kicks booty on Luna.


Edited by DHurst, 09 March 2021 - 04:33 PM.

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#7 photoracer18

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Posted 09 March 2021 - 05:11 PM

LOMO Astelle 95 if you can find one on the used market. They don't get resold often.


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#8 RMay

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Posted 09 March 2021 - 05:59 PM

Please remember, you can pick up a good used Questar Standard for ~$2,250-$2,750, or a good used Field model for $1500 or so. If this is a scope you're going to keep for years and years and years (I've had my Standard for over 35 years now), you're really talking about under $100/year.

 

But I know... indeed... they're expensive.

 

Ron


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#9 Toddeo

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Posted 09 March 2021 - 06:39 PM

Please remember, you can also pick up a used ETX 90(de-fork it -if you want, use it on a photo tripod with a 1/4"-20 screw or attach a dovetail) for $60-$200. I happen to have 2-Questars and 2- ETX 90's. I challenge anyone when viewing-to tell the difference. Now-build quality-that's another story! A lot of high end telescope owners seem to view with their pocket books(to justify the cost). Your eyes are only so good. Enjoy whatever you want to pay for!!!waytogo.gif


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#10 sevenofnine

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Posted 09 March 2021 - 08:22 PM

Just for fun (if that's possible) Ed Ting has an old review of the 90mm Questar, Celestron and Meade on scopereviews.com. Spoiler alert...they are all good for different reasons. It's how I wound up with my C-90. (90% of a Questar...maybe?) hmm.gif



#11 mayhem13

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Posted 09 March 2021 - 08:28 PM

Thanks for the feedback fellas. I like Ed’s videos........very matter of fact. I’ll check this one out. Looks like a photo finish between Celestron and Meade!



#12 barbie

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Posted 09 March 2021 - 09:30 PM

I purchased a Bushnell North star 90mm f14 Mak(same optics and appearance as the C90 except the tube color is silver) used here on the classifieds back around the beginning of January and it is VERY sharp optically and very good mechanically. I've used it on the moon and double stars and it really does give refractor-like images!! It cost me $148.00 shipped to my front door from Washington state. It has very little spherical aberration and is in like new condition. It's long focal length is perfect for lunar, planets, and double stars!! It gave me a tack sharp image of the moon earlier this winter!! It's quite an amazing little scope!! I also had a C90 five years ago which I stupidly sold and it too gave tack sharp images of the moon, planets and double stars.


Edited by barbie, 09 March 2021 - 09:42 PM.

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#13 jgraham

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Posted 09 March 2021 - 10:36 PM

I own several ETX-90s of various vintages and I luvs’m all! The current observer model is very nice.


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#14 Stevencbradley

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Posted 09 March 2021 - 10:52 PM

Whichever you buy, try 1st, or at least buy from someone you really trust. I bought an ETX-90 in the early 2000's, and shall we just say, "I returned it..." that was actually what gave me "Questar fever."

Edited by Stevencbradley, 09 March 2021 - 10:52 PM.

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#15 Joe1950

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Posted 09 March 2021 - 11:30 PM

I have an ETX-90, one of the early ones with really fine optics. And I had a C-90, latest model, which was also very good, and did the primary tube flock. Not difficult to do.

 

I would like to get another C-90. Images seem a little brighter than the ETX, probably better coatings. Plus the C-90 has collimation adjustments easily accessed at the back of the scope. Accessing the adjustments on the ETX is not easy.

 

Would love a Questar. But even $1500 used (which I’ve never seen and probably would be snatched up in 20 seconds) is out of reach for a scope. Too many other uses for money getting siphoned off by the house and yard. I’d love to get in a smaller home with no problems, no basement, small yard and no trees. Maybe one tree.  fingertap.gif


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#16 Ohmless

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Posted 10 March 2021 - 04:04 AM

i need photographic evidence of these scopes.  tongue2.gif


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#17 Jaimo!

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Posted 10 March 2021 - 07:42 AM

As a general rule most 90mm Maksutovs give very nice images for their size.  The only ones I would try and avoid is the old C90 with the center focus ring and as already mentioned the new Vixen.  Also, for clarification, the new C90, made by Synta, is about as good as one could get.


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#18 Jaimo!

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Posted 10 March 2021 - 02:41 PM

Here's a quickie process of Jupiter from a few years ago with the Celestron (Synta) C90, ZWO ASI224MC, ~f/13.9

 

 

post-32845-0-19743000-1527218638.jpg

 


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#19 oldmanastro

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Posted 10 March 2021 - 05:55 PM

I have owned a Meade ETX-90EC for 20 years now. It is a favorite and with optics only surpassed, not by much, by the 90mm Questar. This ETX 90 is a US made model. The mount is another story. Here the Questar wins hands down. 


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#20 Echolight

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Posted 10 March 2021 - 07:50 PM

The Skywatcher 102 f/12.7 looks interesting. I like the models with just the hole in the back.
Specs say 4.6 pounds with accessories. $265.



#21 DHurst

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Posted 10 March 2021 - 10:29 PM

i need photographic evidence...

There’s some here:

https://www.cloudyni...n-c90/page-106 


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#22 Jaimo!

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Posted 10 March 2021 - 10:40 PM

Here's my Copernicus from a few weeks ago, had to shrink to fit on CN, Celestron (Synta) C90, Svbony SV305, f/13.8 (Cheap Scope $135, Cheap Camera $135) The SV305 is based on the Sony IMX290 which has 2.9mm pixels, going by the rule of 5x the pixel size for the appropriate f/ ratio, this is a very good combination without needing a barlow.

 

I am actually considering a lunar mosaic with this combination, after this image.

 

2021-01-24-0117_7_lapl5_ap62_Drizzle15 - stretched - small.jpg


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#23 mayhem13

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Posted 10 March 2021 - 10:42 PM

The optics shared here and on the web are simply outstanding for the C90. Thank you all for sharing your experiences!


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#24 Jaimo!

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Posted 10 March 2021 - 10:53 PM

Here's my Copernicus from a few weeks ago, had to shrink to fit on CN, Celestron (Synta) C90, Svbony SV305, f/13.8 (Cheap Scope $135, Cheap Camera $135)

 

I am actually considering a lunar mosaic with this combination.

 

attachicon.gif2021-01-24-0117_7_lapl5_ap62_Drizzle15 - stretched - small.jpg

Here's the scope from that evening...

 

PXL_20210124_011710742.NIGHT - small.jpg


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#25 Jaimo!

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Posted 11 March 2021 - 11:04 AM

The optics shared here and on the web are simply outstanding for the C90. Thank you all for sharing your experiences!

And to be transparent, the Jupiter image is (and I'm not bragging) exceptional.  The seeing that evening was very favorable, a majority of my planetary images are a little softer.  But part of the luck in "Lucky Imaging" is just getting out there.  The Lunar photos are typical, it is a much easier target, especially when you are stacking images.

 

Jaimo!


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