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Equipment Discussions >> Equipment

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lsfinn
member


Reged: 01/28/13

Loc: State College, PA
alt-az + accessories or gem? new
      #5657877 - 02/02/13 10:37 AM

Ok - I'm torn. I'm trying to decide between a cpc 925 with accessories or a cgem 925 w/o. I'm going to be visual for a while, but have a burning desire to move into imaging. My previous experience (years ago) was always with an equatorial mount.

I understand that alt-az goto mounts are fantastically convenient, and that the alt-az system will be much lighter (and, very possibly, more likely to get out and about). I suppose that when I move toward imaging I can get a wedge; but, will it be as good as a good equatorial mount?

Of course, I could always go cpc 1100 w/o accessories...

I'd appreciate hearing anyone weigh-in with the kind of choice they'd make . . . and why (understanding always that many of the reasons will be subjective!)

Thanks,

Sam


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fmhill
sage


Reged: 07/17/12

Loc: Cape Cod, Massachusetts, USA
Re: alt-az + accessories or gem? new [Re: lsfinn]
      #5657896 - 02/02/13 10:50 AM

If you intend to get into astrophotography, put your money into the best GEM mount you can afford...

Alt/Az motions are intended for terrestrial viewing and are adapted to astronomical viewing however the motions are all wrong for astronomical tracking.

The GEM mount was developed for astronomical viewing and has the correct motions to compensate for the rotation of the earth relative to the position of Stars, DSO's, and other astronomical objects.

Attempting astroimaging with an Alt/Az mount can be done with short exposures and often reduced image quality however an accurate stable GEM mount allows you virtually unlimited exposure times when astroimaging, exposures times are only limited by sky conditions and light pollution provided the GEM mount is polar aligned accurately...


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csrlice12
Postmaster
*****

Reged: 05/22/12

Loc: Denver, CO
Re: alt-az + accessories or gem? new [Re: fmhill]
      #5657922 - 02/02/13 11:09 AM

Yup, if AP is in your future, go with the EQ Mount.

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Midnight Dan
Postmaster
*****

Reged: 01/23/08

Loc: Hilton, NY, Yellow Zone (Bortl...
Re: alt-az + accessories or gem? new [Re: csrlice12]
      #5657936 - 02/02/13 11:17 AM

Alt/az mounts CAN be lightweight and easy to use but the CPC series combines the OTA and mount head into one unit that is not separable. At 60 pounds, I would personally not consider that lightweight, especially when you have to hoist it onto a tripod.

A GEM will certainly weigh more as a complete unit, but breaks down into manageable pieces. And a GEM will do a lot better when you get into AP.

-Dan


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Gargoyle
sage
*****

Reged: 03/13/08

Loc: Long Island, New York
Re: alt-az + accessories or gem? [Re: Midnight Dan]
      #5659040 - 02/02/13 10:34 PM

Go with a GEM, and get the best one you can afford.

Jerry


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