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6" celestron

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#1 donjoy

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Posted 16 March 2013 - 03:24 PM

HI: I am trying to decide between a ETX125 or a celestron 6" scope.Can a 2" setup be put on the 6"? I have a 2" setup on my LX90 8" and it's great.Anybody have any advice? Thanks Don

#2 Dunkstar

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Posted 16 March 2013 - 06:09 PM

You sure can - just be aware that the baffle tube diameter is 27mm on the C6, so that restricts the usefulness, but it's good for securing 2" eyepieces with field stop around or below that, if you have any.

I don't know if the SCT threads are the same on Celestron and Meade, but the C6 has the same thread as all Celestron SCTs up to and including the C9.25.

Btw, they're both great scopes, but the C6 is larger aperture and more capable with the fuzzy stuff :cool:

#3 mclewis1

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Posted 16 March 2013 - 06:15 PM

Don,

Yes, the C6 has the same threads at the rear of the scope as other SCTs so you can thread on an SCT diagonal or visual back and 2" barrel style diagonal.

Using 2" stuff doesn't have big benefits on the C6. The rear opening is just over an inch so you're not going to gain any fov. The space between the rear opening and the focus knob is not great so rotating a 2" diagonal in some orientations can be a problem.

#4 donjoy

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Posted 17 March 2013 - 01:55 PM

HI; Thanks alot guys for the info.Any other info will be appreciated. Thanks Don

#5 Eddgie

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Posted 17 March 2013 - 03:59 PM

Here is my own advice. Don't get either of these.

The ETX has a focal lenght that is almost as long as your 8" scope and while the C6 is quite a bit shorter than this, you can't really benefit from low power, wide field eyepeices, will have a field that is only about as wide as your current 8".

Neither of them will present the same image.

So, what do you get for yor money? A smaller scope with less capabilities across the board!

What is the point? Neither of these scopes compliment your current scope. Neither will give you the same performnce on planets or deep sky that your current scope does, and both will have about the same true field of view.

So, what is the of spending $600 on a scope that can't even do anything that your current scope can't do?

If you want a smaller scope that can do something your current scope can't do, the the first thing is if that it is smaller, it may not match your current scope for planets or deep sky, so the only thing left is true field.

The maximum field size you can currently get would be about 1.1 degrees. The only thing you can really improve on would be to look for a scope that could give you something you don't already have, and that would be wide field views.

You could consider a 120mm f/8.3 achromat (cheap, not difficult to mount) and this would give you twice the true field you have now.

or better yet, you could get a 6" f/5 reflector and get a really big true field with a noticable improvement on image brightness over the 120mm achromat and of course no Chromatic Abberation. It would be smaller and lighther than some 4" APOs too.

What is it that you want out of this new scope because neither of the scopes you mention give you anything that you don't already have.

I would be looking for a scope that compliments the scope you already own rather than doing nothing better than the scope you have.

Sorry if it sounds like I am giving you a hard time about it, but I just don't get why you would buy a smaller scope that puts you in a smaller box than you are already in, in every dimension you care to compare them.

Get outside of your box, and the main reason for going smaller is to go wider.

#6 stevew

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Posted 17 March 2013 - 05:16 PM


So, what is the of spending $600 on a scope that can't even do anything that your current scope can't do?

The OP is probably looking for something smaller that he can set up easier than his fork mounted 8 inch.
If thats what he wants a C-6 would be a great grab and go scope.

Steve

#7 azure1961p

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Posted 17 March 2013 - 06:05 PM

The c6 for me is short of the reflectors erformance I own with nary an attribute other than GOTO and a drive to track at high power. I had the option of a 6"f/5 newt and it would've had some advantages but the ergonomics of sitting behind my sct as it whirls away finding this that and the other thing simply has a charm that the wide field 6" couldn't fill the same way. It's user friendly in a way that's unto itself , or cassegrains in general. I *heart* my c6.

Pete

#8 Patrick

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Posted 17 March 2013 - 10:39 PM

I am trying to decide between a ETX125 or a celestron 6" scope.Can a 2" setup be put on the 6"?



I'd go with the scope with more aperture. Also, I'm not a big fan of the ETX scopes. The Celestron can be setup with 2" visual back and 2" eyepieces, but as others have pointed out the baffle tube limits you on the size of 2" eyepiece. The baffle tube diameter is 27mm so you'd want to use eyepieces with field stop diameters around that size. For instance, the Televue 2" 27mm Panoptic has a field stop diameter of 30.5mm which is just slightly larger than the baffle diameter. I use one with my C6 and can't discern any vignetting, although technically I'm sure it's there. I also use a Denkmeier S1 Power X Switch diagonal with 0.66x focal reduction. That gives me a field of view around 1.5 degrees.

Patrick

#9 jrbarnett

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Posted 18 March 2013 - 11:47 AM

The C6 OTA is $399, not $600, so a relative bargain.

In the flesh (I had both a C6 and C8 on my workbench for corrector cleaning this weekend) the C6 is considerably smaller and more compact than the C8. It's a much better mate for a manual alt-az mount or Celestron Nexstar SE GOTO alt-az mount, for example.

I can see opting for a C6 if he wants to put it on a lightweight mount and deploy scope and mount together in a single step for quick looks or short sessions. If G&G use isn't his purpose, though, I agree with you. The C8 does everything better than the C6 on the performance front and visually the C6 doesn't deliver a significantly different contextual experience.

Regards,

Jim

#10 LivingNDixie

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Posted 18 March 2013 - 11:58 AM

What is the cool down difference between the 6 and 8? An 8in SCT in my environs cools pretty quick, I would think a 6in SCT would be even better.

#11 jrbarnett

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Posted 18 March 2013 - 04:07 PM

The C6 does cool a bit quicker, but you can get a Lymax for the C8 and I don't think they make one for the C6.

- Jim

#12 LivingNDixie

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Posted 18 March 2013 - 04:28 PM

The C6 does cool a bit quicker, but you can get a Lymax for the C8 and I don't think they make one for the C6.

- Jim


Lymax and high humidity of the south don't mix though :(

#13 hottr6

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Posted 18 March 2013 - 04:51 PM

The C6 does cool a bit quicker, but you can get a Lymax for the C8 and I don't think they make one for the C6.

Lymax do not have anything for the C6 in their on-line cattledog, but they WILL make a cooler to your specifications. All they need is the baffle-tube diameter and the distance from the rear of the VB or focuser to the back of the corrector plate.

Remember, in the Lymax system, the air-delivery tube is easily separated (held in place by a single grub screw) from the fan/filter unit, so one can use the same fan/filter across multiple 'scopes by simply changing out the air-delivery tube.

Shane in gray-zone NM.

#14 red eye

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Posted 18 March 2013 - 05:10 PM

Jim,

Please advise me of who is selling the C6 for $399.

Thanks,
David

#15 azure1961p

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Posted 18 March 2013 - 08:35 PM

Dave, maybe OPT? I recall the price at 399 though.

Shane is correct, Lymax will and have made it custom to spec for the c6.

Cooldown time for me seems to have been 45 minutes. Its probably ok a little earlier but frankly i give it a full hour. Blowing a box fan on the ota does help,in lieu of lymax.

Good luck.

Pete

#16 jrbarnett

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Posted 18 March 2013 - 10:11 PM

Sorry, it's gone up to $429 since last month.

http://www.highpoint...n-C6-A-SCT-A...

Regards,

Jim

#17 Tim J K

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Posted 18 March 2013 - 10:34 PM

Use the coupon code ZOEY510 at Highpoint Scientific checkout and it drops it to $408.45.

Tim

#18 Sarkikos

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Posted 19 March 2013 - 08:20 AM

Looks like I got my C6 shortly before the price went up. I'd put it off for a year. I was lucky this time.

Mike

#19 azure1961p

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Posted 19 March 2013 - 02:13 PM

Mike have you done the iOptron/C6 showdown yet?


Pete

#20 Sarkikos

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Posted 19 March 2013 - 04:06 PM

No, not yet. Might be awhile before I get to it. Many irons in the fire and the weather won't cooperate. FWIW, my Mak is branded under Bosma, not iOptron. :poke: Not that there's anything wrong with that.

By the way, I have an Omni XLT 150mm Newt on order ... if it ever gets here. So that shoot out between the C6 and 6" Mak might turn out to be a three-way contest.

:grin:
Mike

#21 azure1961p

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Posted 19 March 2013 - 06:08 PM

I want tickets to that! I kno you'll do it right to.

Pete

#22 jrbarnett

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Posted 19 March 2013 - 07:12 PM

Heck, I should ship you the Astrotelescopes 152mm f/5.9 achromat. No sense stopping at just 3 scopes...

:grin:

- Jim

#23 Sarkikos

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Posted 19 March 2013 - 08:45 PM

Now, that's going too far! I have to thin out the field somehow. Six-inch reflectors only - no 'fractors! :noway:

:grin:
Mike

#24 Matt Houston

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Posted 20 March 2013 - 09:10 PM

Thanks for the coupon code! I just snagged a 'demo' Celestron EdgeHD 11" OTA shipped to my door for only $2546. Woohoo!

#25 red eye

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Posted 25 March 2013 - 04:43 PM

Use the coupon code ZOEY510 at Highpoint Scientific checkout and it drops it to $408.45.
Thanks Tim, I followed your advise to the letter - and it's on the way as I write.

Thanks again,
David






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