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Equipment Discussions >> Refractors

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FishInPercolator
professor emeritus


Reged: 04/30/13

Loc: NYC
Shortest APO?
      #5859714 - 05/14/13 11:59 AM

80mm seems to be around 17" and 102mm around 26" ... can they get shorter?

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tomcody
Pooh-Bah
*****

Reged: 07/06/08

Loc: Titusville, Florida
Re: Shortest APO? new [Re: FishInPercolator]
      #5859771 - 05/14/13 12:20 PM

Tak FSQ85 12.7"
Tak FSQ106ED 16.7"


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FishInPercolator
professor emeritus


Reged: 04/30/13

Loc: NYC
Re: Shortest APO? new [Re: tomcody]
      #5859776 - 05/14/13 12:22 PM

sheesh, 5k

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Cotts
Just Wondering
*****

Reged: 10/10/05

Loc: Toronto, Ontario
Re: Shortest APO? new [Re: FishInPercolator]
      #5859809 - 05/14/13 12:31 PM

Hi, Neil. Welcome to CN. Who's that guy with you?

Srsly, 80 mm isn't going to get you much deep sky visually but as a camera lens the 80mm aperture is wonderful.

I have an 80 mm Fluorite doublet that cost under $1000 and shows no false colour in photos up to 5 minutes or more.... You don't have to spend the big bucks....

Dave


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FishInPercolator
professor emeritus


Reged: 04/30/13

Loc: NYC
Re: Shortest APO? new [Re: Cotts]
      #5859841 - 05/14/13 12:42 PM

lol...

thanks... Explore Scientific has a 102 carbon fiber that weighs 7 lbs for 1499... I was originally considering an 8" EdgeHD for dso observing but at 14 lbs it requires a tripod that weights at least 40 w/counterweight. So perhaps this is a more viable solution


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Scott BeithAdministrator
SRF
*****

Reged: 11/26/03

Loc: Frederick, MD
Re: Shortest APO? new [Re: FishInPercolator]
      #5859848 - 05/14/13 12:45 PM

TMB 92SS

https://www.astronomics.com/tmb-92-signature-series-92mm-apo-refractor-optica...



"ultra-short 13.25” length for travelling"


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Gregg Carter
member


Reged: 08/11/10

Loc: Northern New Mexico
Re: Shortest APO? new [Re: Cotts]
      #5860910 - 05/14/13 08:39 PM

Quote:

Hi, Neil. Welcome to CN. Who's that guy with you?

...<snipped>...

Dave






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MooEy
member


Reged: 10/02/07

Re: Shortest APO? new [Re: Gregg Carter]
      #5860992 - 05/14/13 09:27 PM

It depends on how short you want it to be...

http://www.sciencecenter.net/hutech/borg/miniborg/

~MooEy~


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dennilfloss
sage


Reged: 01/06/13

Loc: Ottawa, Canada
Re: Shortest APO? new [Re: MooEy]
      #5861073 - 05/14/13 10:13 PM

This one looks pretty short.

http://ca.skywatcher.com/_english/01_products/02_detail.php?sid=417


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Derek Wong
sage
*****

Reged: 04/27/08

Loc: Glendale, CA
Re: Shortest APO? new [Re: MooEy]
      #5861192 - 05/14/13 11:06 PM Attachment (14 downloads)

Other than Borg scopes, which can be super small aperture or break down into tiny parts, the Tak FCT-65 is about 11". If you adapt one for a Borg reducer (no tube cutting), it is 9.75", and if you cheat and remove the dewshield it is close to 6".

Derek


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: Shortest APO? new [Re: Derek Wong]
      #5861227 - 05/14/13 11:29 PM

JRBARNETT doesn't guide much, but when he does... it is with the Borg modified FCT-65

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Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: Shortest APO? new [Re: Mike Clemens]
      #5861329 - 05/15/13 01:14 AM

Well, this could be a trial scope to get started and see how this concept works for you without getting a lot of money tied up into it:

http://www.adorama.com/CNT50.html

If the experiment goes well, see if the Adorama guys can show you this:

http://www.adorama.com/BAAE11118.html

The thing to keep in mind is something like this next one shows a nice image, but again, it is bigger, and more expenive:

http://www.telescopengineering.com/tec/apo110fl.htm

-Rich


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CounterWeight
Postmaster
*****

Reged: 10/05/08

Loc: Palo alto, CA.
Re: Shortest APO? new [Re: Starhawk]
      #5861593 - 05/15/13 08:01 AM Attachment (15 downloads)

My FSQ-85 is pretty short, I haven't measured it but OPT site says it can collapse to ~12.6". The upper dovetail plate in the image is 7" long.

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Scott99
Carpal Tunnel
*****

Reged: 05/10/07

Loc: New England
Re: Shortest APO? new [Re: CounterWeight]
      #5861833 - 05/15/13 10:36 AM

If we are spending $5K, don't forget the stubby TEC110 at 19"

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PhilCo126
Post Laureate


Reged: 01/14/05

Loc: coastline of Belgium
Re: Shortest APO? new [Re: Scott99]
      #5867175 - 05/17/13 01:15 PM

Why do You need a short Apo ? Travel or as guidescope

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FishInPercolator
professor emeritus


Reged: 04/30/13

Loc: NYC
Re: Shortest APO? new [Re: PhilCo126]
      #5867236 - 05/17/13 01:45 PM

I've been considering it for planetary and dso

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Scott BeithAdministrator
SRF
*****

Reged: 11/26/03

Loc: Frederick, MD
Re: Shortest APO? new [Re: FishInPercolator]
      #5867805 - 05/17/13 05:44 PM

DSO - wide is good.
Planetary - you will need a short f/l EP to bump up the mags.


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Kon Dealer
professor emeritus


Reged: 01/05/11

Loc: Cambridge UK
Re: Shortest APO? new [Re: Scott Beith]
      #5867886 - 05/17/13 06:27 PM

And there's me thinking that my Kson 102ED was short at 20.5" (retracted).

However the (carbon fibre) OTA only weighs 5.7lb. I reckon thatmust set some sort of record


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MooEy
member


Reged: 10/02/07

Re: Shortest APO? [Re: Kon Dealer]
      #5867972 - 05/17/13 07:25 PM Attachment (26 downloads)

Hmm...

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FishInPercolator
professor emeritus


Reged: 04/30/13

Loc: NYC
Re: Shortest APO? [Re: MooEy]
      #5867991 - 05/17/13 07:37 PM

I would like the 2nd one from the left please, thank you.

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