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Post by rojasj on Apr 1, 2012 13:16:28 GMT -5
I currently own a Celestron C6R but the IStar Perseus AT 150-10 has caught my attention. However, I have a few questions about it before I figure out what I can sell to fund the purchase.
I currently own a Celestron C6R with a dual speed Moonlite focuser. My main targets are double stars and planets.
Optical quality: How does the Perseus AT 150-10 compare to the C6R?
CA: Does the AT 150-10 have more, less or the same CA as the C6R.
Mount: I currently use a CGEM with my C6R and could not afford to purchase a bigger mount due to moment and the weight of a bigger mount. Would the AT 150-10 ride well on a CGEM or am I pushing the mounts ability's a bit too far?
Thanks,
Javier
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Post by Watcher3 on Apr 1, 2012 13:52:09 GMT -5
Hi Javier. Welcome aboard! I'm sure Mike or Ales will be better ale to answer your questions, but I think I can give you some idea of what you'd be getting. The F/10 should be significantly better color corrected than the F/8 C6R. Optically, it's hard to say if it would be noticeably better, because the C6Rs are of such variable quality. If you have a good one, it just may be as good as the Istar. All that aside, though I think with your needs and intended targets, you would be better served with an ISTAR F/8 R30 lens. Yes it costs a bit more, but you can save a little by reusing the Moonlight. I am told that the R30 lenses receive a little more attention than the standard achros, so it would almost surely be better figured than you C6R, and would be better corrected for color than even the standard F/10 achro. And, although I would probably be happy with an F/10 on an Atlas, I don't know if that would meet everyone's idea of a good match.
Like I said, Mike or Ales should have much more in the way of advice, but I thought you might like to think about some other possibilities in the meantime. Thanks again for joining us at the ISTAR Scope Club.
Joe
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Post by mikey cee on Apr 1, 2012 14:13:35 GMT -5
I concur with Joe. Plus an added future bonus would be a "cheap" Raycorr 6 for around $500- $600 and VOILA you have a 6" F/8 apo quality planetary scope!!  What's wrong with that idea?  Mike |
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Post by jamesling1000 on Apr 1, 2012 23:59:38 GMT -5
Hi Javier.
I am currently having the Celestron C6R F8, but not sure yours is the F5 or F8 version...?
I do not have any ISTAR F8 or F10, as such I can only give you my best knowledge on how would the Perseus AT 150-10 compare to the C6R F8, after being using the Perseus 208-9 for more than one year....
1. Definitely the CA is going to much lesser for the F10, unless you go for F8, which the ISTAR should be either the same or better...
ISTAR is definitely using a much better glass quality and coating as compared to Celestron....
My Celestron glass coating is flaking.....after using for a few years.....
2. Not all F8 are the same, even both are achromatic....
Ask yourself , how much is the max power you can push your C6R for Jupiter, and still get a good contrast....
My C6R is not able to collimate, and if you remove the lens and clean, you must align it back with the " TRIANGLE " marking.
As such, I cannot get get a good contrast when powering beyond 200X...
ISTAR len cell is definitely able to collimate......., although I never did any collimation to my 8" ISTAR yet....
3. The CGEM mount you have mentioned, is it referring to the CG5 version which the capacity is around 25 lb....
My C6R came with the CG5 mount, as such it is not suitable for the ISTAR 150-10, simply you have accessories to go into this OTA...
Just like ISTAR say my 8" OTA is 45 lbs, the full OTA assembly is almost close to 70 lbs..., just the ISTAR solid mtg rings and my dovetail is already 15 lbs....
I think Mike and Ales, will be able to answer to you the bare OTA weight....., as well as other accessories you may want to add on...
Don't forget you cannot use C6R mounting ring, as its dia is exactly 150mm, while ISTAR tube dia is much more......
I hope some of my input is useful for you now to consider before deciding on which one to choose, either F8 or f10....
REgards
James Ling
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Post by boomboom on Nov 1, 2012 17:05:26 GMT -5
I have the f8 too and mine has the adjustable cell and I can get mine to 300X on the good,all too rare, nights. I'm hanging out for an 8" one day. In the mean time it's the Raycorr.....waiting. As far as mounts also waiting on the Skywatcher EQ8 when that comes out, 50kg sounds good to me.
Matt
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Post by scopejunkie on Nov 13, 2012 15:46:20 GMT -5
I have a C6R that can go beyond 300x as well. The lens is quite good as far as overall correction is concerned with smooth surfaces. I may have an answer for James concerning his C6R. I wonder if he was able to go 300x before he cleaned the lens?
Scopejunkie
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Post by jamesling1000 on Nov 13, 2012 20:35:12 GMT -5
I have a C6R that can go beyond 300x as well. The lens is quite good as far as overall correction is concerned with smooth surfaces. I may have an answer for James concerning his C6R. I wonder if he was able to go 300x before he cleaned the lens? Scopejunkie Hi Bro..... Thanks for reminding me about my C6R quality before I removed and cleaned up my lens.... I purchased the C6R 10 years ago, which is non collimate type, for comparing the views against my Ultima C8 goto..., before considering a more premium APO refractor, to catch Mars opposition in 2005.... Surprisingly the contrast at Jupiter which I tested it against my Ultima C8 is similar, except the view is dimmer.... The power for Jupiter for both these 2 scopes never go beyond 250X, and usually I use 200X at max....for the best view... I always used Jupiter as the target to compare different scopes coz the size is big and is almost whole year round , you can view it.... That comparison result also decided why I go for the mewlon 10"... After a few years of leaving the C6R scope in my living room, I discovered the coating flakes around the outer region of the lens, and that is why I removed it and clean, and then I aligned the 2 lens with the triangle marking, and it seems that the contrast is affected, until I slowly rotate them , trial and error method until the image is good..... last weekend after I received the Lunt solar wedge, and to save time, I use the C6R to have a view of the Sun around 5pm....sunset time.... And this is the photo I took from my hand phone, from the eye piece of the C6R using the Lunt Solar Wedge... REgards James Ling Attachments:
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Mike
