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I need some suggestions!

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#1 luigis

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Posted 15 July 2013 - 12:09 PM

Hi,

I'm looking for a good refractor for Astrophotography, focal lenght is not an issue but I want as less CA as possible and also a flat field or a field flattener in the package. I'll be imaging with a DSLR. Can you give me ideas for a budget around $1500-$2000 for the whole package? (including flattener or reducer if needed).

Thanks!
Luis

#2 luigis

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Posted 15 July 2013 - 04:37 PM

Did I err the price, the forum or the day of the week? :-)

#3 neotesla

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Posted 15 July 2013 - 05:35 PM

Patience... people will respond in time. But FYI, you might want to narrow the field a bit, what are your interests in AP? DSO, planetary, wide field... that sort of thing.

#4 luigis

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Posted 15 July 2013 - 05:57 PM

Patience... people will respond in time. But FYI, you might want to narrow the field a bit, what are your interests in AP? DSO, planetary, wide field... that sort of thing.


Mostly wide fields or DSOs. I will adapt to the focal length of the scope, FL is not so important but I want a good quality image. I owned a generic 80mmED (doublet) previously and it was ok but the CAs were a little too much for me.

#5 timps

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Posted 15 July 2013 - 07:19 PM

Have a look at the TS optics 90mm Apo test on Astroforen. It has colour correction comparable to Takahashi! Competitively priced to.
Sorry for not posting the link. That is beyond by computer know how.

#6 Edwin Quiroga

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Posted 15 July 2013 - 07:53 PM

Hey Luis!

I used to have a Vixen ED81S. Just for visual. Awesome scope! Very hard to find out the slightest CA. I sold it only for purchasing the bigger brother: ED103S. It's about 1500 $ and the focal reducer about 250 $. The new Tak FC76 is about... 1900-2100 ? But plain, any accesories.

Best!

#7 Kendahl

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Posted 15 July 2013 - 08:24 PM

I just ordered a William Optics GTF102. It's a 102 mm triplet ED apochromat with a built-in field flattener. Since my DSLR does not have live view, I wanted the DDG focuser. Price from Agena AstroProducts was $1798 with free shipping. Their web site says they have one left.

#8 Peds

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Posted 15 July 2013 - 09:01 PM

I'll throw one out there that isn't mentioned very often: Borg 71FL f/3.9 Astrograph set. Love the Borg scopes.

There are the less expensive and bigger 80ED scopes of various kinds (Orion, TS and Stellarvue I've used and liked them all) with their respective field flatteners.

Another option would be the AT65EDQ f/6.5 quadruplet which wouldn't need a flattener (Or it's Teleskop Service analog).

I've heard good things of the TS 80/480mm with the flattener but never used it myself.

These are all small-ish focal lengths (max of 600mm), there may be other larger options.

The important question is: how good is your mount?

P.

#9 luigis

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Posted 15 July 2013 - 10:52 PM

Thank you for the suggestions!

The AT65EDQ looks interesting and the William Optics with built-in flattener too.

I'm really liking the William Optics!

I'm worried about scopes that claim to have "minimum CA" because to be honest I hate CA so even if its impossible in a refractor to have zero CA I would like it to be as close to zero as possible.

Peds: The mount is not an issue because I can get a good mount locally, I'm asking about the scope because I'll probably travel and I can then bring one from abroad.

#10 Peds

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Posted 16 July 2013 - 11:55 AM

Depending on the focal length, another idea would be to get a lens instead of a refractor if it's for astrophotography only... I know I wouldn't mind a Leica APO Telyt 180 f/3.4 or the Nikon 180 f/2.8 ED AIS, but you seem to want something longer?

P.

#11 luigis

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Posted 16 July 2013 - 12:35 PM

Depending on the focal length, another idea would be to get a lens instead of a refractor if it's for astrophotography only... I know I wouldn't mind a Leica APO Telyt 180 f/3.4 or the Nikon 180 f/2.8 ED AIS, but you seem to want something longer?

P.


I have a Canon 400mm F5.6 lens. That's why I liked the William Optics because it is about twice the focal length of my Canon tele. My only concern is about CA,for a scope of that focal length and aperture the price seems to be too low. I would like to see some pics taken with the scope.

#12 Simoes Pedro

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Posted 16 July 2013 - 02:31 PM

http://www.teleskop-...ywords=apo q...

http://www.teleskop-...nguage/en/ke...

#13 orlyandico

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Posted 17 July 2013 - 08:54 AM

i can say my AT90EDT is great. very obvious there is no CA at my imaging scale. the downsides are, it needs a flattener/reducer (I use the Orion non-reducing flattener), and it's really heavy.






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