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Celestron Nexstar SE Mount Qs (6/8 version)

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#1 jrbarnett

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Posted 10 December 2010 - 12:09 PM

Hiya.

From time to time I get the hankering for a reasonable quality alt-az GOTO mount capable of carrying a variety of lighter weight payloads. Each time my mind wanders down this path, I eventually stumble on the Nexstar SE mount (the version for the 6"/8" OTAs, not its smaller cousin).

Here's the thing, though. Most of my smaller scopes are refractors. They run the gammut from a Takahashi FS-78 and TV-102 to a handful of vintage achromats (80mm f/11.4, 60mm f/15, etc.).

I realize that this mount was designed with a stubby, fat catadioptric OTA in mind, but with reasonable care do you think that such a mount would be suitable for the refractors I list? Does it have settable limits or would I need to manually monitor altitude position to avoid colliding the focuser with the base? Any other obvious or not-so-obvious issues I should consider?

Thanks!

- Jim

#2 letimotif

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Posted 10 December 2010 - 12:37 PM

You can set slew limits through the hand controller, but limiting zenith directions is not really an option.

You can counterweight your refractors so that they clear the base, but you want to make sure you don't exceed about 12lbs.

All in all, I've been successful with an 80mm f/7 refractor, but that's about it.

I'd go to the MiniTower, rather than the NexStar. I have both, and the MiniTower gets as much use as my CPC. The flexibility of OTA mounting options is just that much superior to the SE mount.

I know folks have reported issues with MTs. Other than the GPS starting out a little wonky, everything on mine has worked perfectly.

#3 jrbarnett

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Posted 10 December 2010 - 02:36 PM

Thanks. I looked at the iOptrons too. Beyond the QC issues some folks have experienced, I am turned off by the price. $750 vs. $450. I'm looking for cheap, really, as this will be an occasional-use GnG mount for the rare times when I don't go with an EQ mount.

Maybe I'll just continue to flog my very tired, battle scarred CG5-GT as my quick set-up GOTO mount for now. :grin:

- Jim

#4 jason_milani

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Posted 10 December 2010 - 02:52 PM

Your FS-78 would work but that's about it.

#5 RTLR 12

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Posted 10 December 2010 - 07:52 PM

I use my SE mount with my SV 70 ED and my Onyx 80 EDF with 2" accessories and have no problems, but any thing longer will interfere with the mount.

Stan

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#6 islandsteve11

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Posted 11 December 2010 - 11:18 AM

I've read a couple people have claimed using a 90mm Apo with an SE, but I don't remember the particular scope. :o

#7 BSJ

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Posted 06 January 2011 - 07:47 PM

Yes, you can set zenith limits with the hand controller.

Both upper and lower limits...

#8 Terrance

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Posted 07 January 2011 - 02:17 PM

I tried a 6SE mount (same as 8se) with a Orion 120mm f/5 achromat, but quickly abandoned that rig, since about 60 degrees was the maximum elevation I could get with that rig, and it cut out too much of the sky. In other words, clearance was main problem

I set slew limits to 60 degrees to avoid collision with tripod on gotos, but you still have to be careful moving it manually since slew limits only relate to gotos.

If you can live with altitude limits like that, longer lighter refractors might be used, as all stars are less than 60 degrees high at some point while rising or setting.

#9 skybsd

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Posted 07 January 2011 - 06:00 PM

The way to increase the ability to get to zenith is to use the wedge accessory.

Regards,

skybsd

#10 drexelpbp

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Posted 07 January 2011 - 11:46 PM

Do you know if the wedges are still available for the 8se?

Thanks

Gary

#11 skybsd

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Posted 08 January 2011 - 06:48 AM

Hi,
The Celestron NexStar Wedge, designed for both the 6SE and 8SE (and other earlier models, too), now does appear discontinued by Celestron.

Not sure what alternatives exist from Celestron though - perhaps a quick reaching out to them to find out might be in order..,

Regards,

skybsd

#12 RAKing

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Posted 08 January 2011 - 08:06 AM

Mine worked very well with my AT80, but I don't think you would be satisfied with the performance of your longer scopes.

Cheers,

Ron

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#13 RTLR 12

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Posted 08 January 2011 - 09:56 AM

Gary,

The Celestron Heavy Duty Wedge #93664 will fit the 6/8 SE mount, but it's pricey.

Stan






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