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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
Carpal Tunnel
*****

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? new [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? new [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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RAKing
Postmaster
*****

Reged: 12/28/07

Loc: West of the D.C. Nebula
Re: Shortest APO? new [Re: FishInPercolator]
      #5868912 - 05/18/13 07:55 AM Attachment (12 downloads)

Quote:

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




That looks like the William Optics version of the ubiquitous carbon fiber 80mm triplet. If you want something like that, Orion has a nice one available:

Orion 80mm Triplet

FWIW, I owned the Astro-Tech model and it was a great scope! I used it on the Celestron NexStar mount. Very lightweight and very portable.

Cheers,

Ron


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Kon Dealer
professor emeritus


Reged: 01/05/11

Loc: Cambridge UK
Re: Shortest APO? new [Re: RAKing]
      #5869403 - 05/18/13 01:58 PM

Snap- I use my Kson 102mm on my SE mount.
Here it is at zenith


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Kon Dealer
professor emeritus


Reged: 01/05/11

Loc: Cambridge UK
Re: Shortest APO? new [Re: Kon Dealer]
      #5869409 - 05/18/13 01:59 PM Attachment (19 downloads)

Rats! Didn't load again
Here's another go.


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desertlens
scholastic sledgehammer
*****

Reged: 12/06/10

Loc: 36N 105W
Re: Shortest APO? new [Re: FishInPercolator]
      #5869601 - 05/18/13 03:42 PM

Forget much planetary but this is the shortest APO I've seen.

SV50 APO


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REC
Post Laureate
*****

Reged: 10/20/10

Loc: NC
Re: Shortest APO? new [Re: RAKing]
      #5870946 - 05/19/13 09:12 AM

That looks like a nice set-up. Been thing about getting a small Goto for my 80mm. How do you like the performance?

Can you use the scope just in manual mode? I like to just point it at something sometimes.

Thanks,

Bob


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MooEy
member


Reged: 10/02/07

Re: Shortest APO? new [Re: RAKing]
      #5874013 - 05/20/13 03:38 PM

Quote:



That looks like the William Optics version of the ubiquitous carbon fiber 80mm triplet. If you want something like that, Orion has a nice one available:






what if i were to tell you that it's actually the flt-98cf

Edited by MooEy (05/20/13 03:38 PM)


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beanerds
sage


Reged: 07/15/08

Loc: Darwin Australia
Re: Shortest APO? new [Re: MooEy]
      #5886348 - 05/26/13 11:02 PM Attachment (5 downloads)

My Takahashi SKY90 , 360mm without 2 inch diagonal , 440mm with 2 inch diagonal .
Brian.


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FishInPercolator
professor emeritus


Reged: 04/30/13

Loc: NYC
Re: Shortest APO? new [Re: PhilCo126]
      #5886398 - 05/27/13 12:04 AM

for portability and to be used as a guidescope yes

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