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Something for nothing: Celestron C90

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#2201 Simon B

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Posted 09 August 2018 - 06:37 PM

I have an Orion Tritech II fluid head, and I really really don't like the Mak on it. My 80mm achro is fine, but the Mak... Noooo no.

 

The pronto is interesting for travel, or will be when it becomes available in the US, but the AZGTi is even more so

 

Yeah, a fluid head isn't great, but it's better than a standard ballhead! Unless it's some sort of high-quality adjustable friction based ballhead...



#2202 redbaron12

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Posted 09 August 2018 - 09:00 PM

I've seen that pic a few times. It's interesting, but makes me wonder:

 

  • Does it stay in position at high power if you let go of everything?
  • Whats the difference between that and a biggish 44m ball head (used sideways) ?

 

I've been considering a carbon fiber tripod with a biggish, 44mm ball head for travel (and I do mean travel: air, hike, small boat, not car travel)

Obviously a dedicated mount, like a dwarfstar, is better but i had the manfrotto fluid head and tried this knowing that I was going to buy a TW1 when they went on sale. It was cheap and easy to make. I find it to hold well with the tension adjusted right on a C90.  I also use my Onyx 80 on it and that’s a little heavier and that works also 

 

I also have a ball mount and tried that with the Onyx.  I didn’t like that combo at all. It just wasn’t as smooth as i would have liked

 

I think by moving the weight from the top, where it puts a lot of pressure on the head when pointed up, to a point equal to the axis, allows the head to hold it better. It works for me, but then a lot of folks  don’t like an AR102 on a TW1, but it works for me. Yes it jiggles a bit, but not enough to really phase me


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#2203 Dave Ponder

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Posted 11 August 2018 - 09:48 AM

Here is my new grab ‘n go setup, a C90 on a NexStar mount...a one trip package....maybe first light tonight.

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#2204 Cajundaddy

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Posted 11 August 2018 - 12:35 PM

Here is my new grab ‘n go setup, a C90 on a NexStar mount...a one trip package....maybe first light tonight.

  waytogo.gif Mine usually rides on an SLT mount and it works great!



#2205 barbie

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Posted 12 August 2018 - 11:39 AM

I use my C90 on an Orion Eq1 with R.A. clock drive and it works great!


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#2206 PXR-5

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Posted 12 August 2018 - 11:51 AM

I use my C90 on an Orion Eq1 with R.A. clock drive and it works great!


I've really considered getting an EQ1 for mine ;)
Glad to hear it works for you :)
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#2207 PXR-5

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Posted 13 August 2018 - 07:44 AM

I just ordered a zoom EP for mine. I really never cared for the idea of a zoom, but for the portability of the c90 I think it makes sense. :)

#2208 Adun

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Posted 13 August 2018 - 10:10 AM

I just ordered a zoom EP for mine. I really never cared for the idea of a zoom, but for the portability of the c90 I think it makes sense. smile.gif

 

The Celestron Zoom really does match the C90 very well.

 

As for the EQ1, you might as well consider an Exos Nano, It fits the C90 really well and is only $99:

 

Exos Nano with C90

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#2209 Jim1804

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Posted 13 August 2018 - 03:13 PM

Dave - is that the Nextstar 4/5 mount? The C90 looks big (but well-mounted!) on it!

 

And I 2nd the zoom lens - I use mine with both the C90 and ST80 (at least for moon/planets) - covers most of the mags I would need on a given night.



#2210 Dave Ponder

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Posted 13 August 2018 - 03:19 PM

Dave - is that the Nextstar 4/5 mount? The C90 looks big (but well-mounted!) on it!

 

And I 2nd the zoom lens - I use mine with both the C90 and ST80 (at least for moon/planets) - covers most of the mags I would need on a given night.

Yes, it is a NexStar 4/5SE mount holding that massive C90.  You need something solid like that for one of these monsters wink.gif.

The zoom is a great addition, like you said, covers most mags you would use on the planets, so easy!


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#2211 Jim1804

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Posted 13 August 2018 - 10:56 PM

Finally cleared up in Carolina, with better than average seeing. Let the C90 acclimate for a bit, then walked it to the end of my street to clear the trees. Beautiful crescent moon along side Venus. Even with the moon really low and some tube currents, the terminator looked great. Watched the moon sink below the pines in the 32mm EP. A nice half Venus, followed by some time on Jupiter and Saturn.
Turned the scope to Mars, blazing in the southeast. The C90 didn’t disappoint- in a 6mm EP the south polar cap and Syrtus Major were obvious - with Hellas well defined to the south. Mars danced around some, but the seeing held, and the albedo features were clear.
I attempted a sketch - I’m definitely no artist, but you can clearly see what I saw - I didn’t confirm what I was seeing until after; so I’m fairly impressed with the detail that was visible. Hurray for the C90 and the abating dust storm!

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#2212 PXR-5

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Posted 15 August 2018 - 03:59 PM

I received my Celestron Zoom EP today, along with clouds. Nice looking thing and a real nice case. :)

Hopfully not much of a cloud curse for an EP ;)
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#2213 Jim1804

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Posted 15 August 2018 - 08:04 PM

I received my Celestron Zoom EP today, along with clouds. Nice looking thing and a real nice case. smile.gif

Hopfully not much of a cloud curse for an EP wink.gif

I think you'll like it - I have the Meade version, which as far as I know, is identical. There are some weird eyerelief issues as you move through the zoom - and some blackout angles at certain mags - but you quickly learn to hold your eye just right and they go away - worth it in my book for a relatively cheap way to only carry one EP with me for quick sessions...



#2214 PXR-5

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Posted 15 August 2018 - 08:39 PM

Yes, I got it for those quick looks with my small scopes and for travel when I want to keep things simple. I've been on the fence for 10 years, just woke up and pulled the trigger :)
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#2215 Jim1804

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Posted 30 August 2018 - 09:57 PM

The great thing about this scope, for me, in a nutshell: went out this evening, started out clear, soon followed by high clouds moving in and out fairly quickly. Lots of lightning off to the north. Had to move up and down my street dodging clouds and trees. Saturn looked amazing at 8mm (156x) - nice banding and Cassini visible all the way around. I think I could probably tweak the collimation a little more, but it’s pretty close, given the view I’m getting.

When clouds covered Saturn, I turned to Mars. SPC with some limb brightening (blue-white) clear; albedo features in and out in the Southern Hemisphere (Terra Sirenum?). Enjoyed the view for a few minutes until the clouds covered the planet and the lightning seemed to be getting closer.

My realization - with the horrible weather this summer, if it weren’t for the C90, I wouldn’t have seen much of Mars at all - not worth even setting up my *big* scope, a C6. That alone makes it worth the price of admission.
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#2216 PXR-5

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Posted 31 August 2018 - 10:56 PM

I had just as good of a view of Mars last weekend in the C90 as in my 127 mak and c6. All of which are collimated. Seeing was not the best, maybe that had something to do with it.
This little scope is a true gem, I bought it as a little gimmick and for Lunar work, but it always surprises me.

I usually keep the FR/C on it, seems to get almost 2° :)

Edited by PXR-5, 31 August 2018 - 10:57 PM.

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#2217 Paul Lennous

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Posted 26 September 2018 - 01:43 PM

The C90 came out during an evening troop meeting this past Monday. The boys enjoyed views of Jupiter, Mars, and Saturn. The parents were surprised at what can be seen with it, as well as its price since it isn’t a “department store telescope”. 

 

Hopefully, we have a few more converts. 


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#2218 Binojunky

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Posted 26 September 2018 - 02:19 PM

I have been using mine a bit also, this is C90 #2, looking back at my notes when I had the first one, I used a TV 11mm Plossl  and a x2 Barlow one night for a magnification  just  over x220, the current one I have seems to run out of steam at about x180 but the moon is lower to the horizon, light pollution has increased a lot so it may just be a case of not getting a night of really good conditions? ,D.



#2219 Adun

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Posted 26 September 2018 - 02:24 PM

I had just as good of a view of Mars last weekend in the C90 as in my 127 mak and c6.

 

This happened to me a several weeks ago as well, I observed Mars with the C90 and took notice of how the view was essentially as good as I was getting with my C6.

 

While Jupiter is a different story, and Saturn is somewhere in between, still as Jupiter is now lower, more and more of the recent nights I've been observing with just the C90, while the C6 (and the 10" dob) relax.



#2220 punk35

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Posted 26 September 2018 - 04:21 PM

I just got an orange tube C90 spotter. I wanted it for a g&g/travel scope. I haven’t had a chance to try it yet, but I’m looking forward to testing it out against the AT102ed, and a Lumicon 80mm Super Finder. Apples to oranges I know, but it will still be fun. And it looks so cute compared to the C11! lol.gif

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#2221 PXR-5

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Posted 26 September 2018 - 07:55 PM

A bit under mounted 😁
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#2222 caheaton

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Posted 30 September 2018 - 11:19 PM

This thread just keeps going and going.....grin.gif   (kinda like the C90).

 

Just thought I'd add another report.  I brought mine out last night for a quick look Venus, then decided to stick around and give it a go at imaging Mars and Saturn (haven't processed the data yet, but visually Saturn looked great, Mars less so but polar cap and hazy details were there visually at around 125x).

 

I left it outside and returned later for what I figured would be a quick half hour or hour long session.  I ended up spending 3 hours exploring various double stars in Aquarius, Pegasus and Cepheus, most of which were "first time observing" for me.  I was using the Sky Watcher Light Chariot (SW's version of Celstron's SLT mount) which works very well with the little C90, highly portable since I usually run it off of the 8 AA battery pouch that hangs from the mount.  The whole thing can be carried with one hand (including scope).  Tight doubles of nearly equal magnitude are especially pleasing, since the diffraction arcs that appear around the stars at around 125X (2x barlow of a 20mm Sterling plossl) just add to the asthetics...made it seem like to eyes peering back at me from deep space (29 Aqr).


Edited by caheaton, 30 September 2018 - 11:23 PM.

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#2223 caheaton

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Posted 01 October 2018 - 03:14 PM

Still working on the data, but here's a quick initial process using registax & gimp from the laptop.  Mars turned out better than I expected, considering how it was looking naked eye.  Image was taken through the C90 using the Starshoot 5MP without a barlow.

 

Just had a chance to look at this photo from the desktop (I'd processed it from the laptop).  Looks like I blew out the highlights a touch, will have to adjust that....the laptop has a dimmer screen so I missed that initially.

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Edited by caheaton, 01 October 2018 - 10:56 PM.

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#2224 Eric63

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Posted 01 October 2018 - 09:19 PM

Some time ago I checked the focal length of my C90 and found it to be 1450mm as opposed to 1250mm (and my 127mak is 1750mm and not 1540mm). Just some food for thought when choosing an eyepiece.

Under my typical seeing condition I find my TV11mm plossl gives the best views (132x). If the seeing is good I will take out my TV 8mm (180x) but that's about the max I will go.

Eric

Edited by Eric63, 01 October 2018 - 09:21 PM.

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#2225 pacazo

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Posted 01 October 2018 - 10:30 PM

Mounting the Pinty laser pointer on my C90. The double ring mount comes with the pointer. It fits perfectly around the finder. I didn't want to file the rings but I could have done so to place the pointer mount between them. Almost looks like it is made for it.

 

pinty2

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