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Best Ultra Lightweight 80-100mm Apo Refractor?

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#1 windyphotons

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Posted 16 April 2012 - 06:15 PM

I am in the market for a lightweight apo refractor that is under 8lbs (the lighter, the better) with a 2" focuser. Any suggestions or recommendations?

#2 RTLR 12

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Posted 16 April 2012 - 07:16 PM

:gotpopcorn:(does anyone know where I can find a good used car?)

#3 Denimsky

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Posted 16 April 2012 - 07:18 PM

Hi.
- Do you have budget?
- Does it have to be Triplet or is a doublet OK?
- 8lb including rings and mount plate etc?
- Is this for visual or AP?

Borg scopes are the lightest.
If you can find a used Borg 101ED, that would be one of the lightest 4" scope if not the lightest.

I own a Borg 125SD and even that scope (4.9") is just 7.8lb without the focuser.

#4 gatorengineer

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Posted 16 April 2012 - 07:54 PM

Scrat had it right this one will be entertaining....

As a former 150ED Borg owner, best and Borg, dont go in the same sentence, and a doublet is not to some an APO. Borg the Lightest absolutely....

under 8 probably the tmb 92SS that Astronomics sells....

unless you can find an AP Stoway and have lots and lots to spend......

#5 Denimsky

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Posted 16 April 2012 - 08:01 PM

Borg is not definitely the best but don't judge the quality of the current Borg lines with the 150ED. 150ED is a quite old design and the current Borg design has been much improved. The current cells don't suffer from the collimating issues like past Borgs. Borg 125SD's lens and cells are made by Pentax.

#6 Binojunky

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Posted 16 April 2012 - 08:22 PM

You could do worse than the Stellarvue ED80 in Carbon Fibre, dave.

#7 Renae Gage

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Posted 16 April 2012 - 09:05 PM

TV-85 should suit your criteria, although I forget the tube weight. It's a great ultraportable scope.

#8 Simoes Pedro

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Posted 17 April 2012 - 06:07 AM

LOMO 80/480 from Stellarvue sould do it.

#9 plyscope

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Posted 17 April 2012 - 06:13 AM

Vixen doublet apo's such as ED81S or ED103S are lightweight for their aperture and have excellent Japanese optics.

web page

Andy

#10 dhaval

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Posted 17 April 2012 - 08:35 AM

Explore Scientific 80/480mm ED APO. The optical tube assembly weight is 7.5lbs - this includes the focuser. Not sure if the assembly includes the finderscope though.

#11 Maverick199

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Posted 17 April 2012 - 11:16 AM

How about the Carbon fiber's? Both Orion and Stellarvue offer these.

#12 joelimite

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Posted 17 April 2012 - 12:25 PM

If you're looking for a little more aperture, you could always get a TMB 92L. It weighs just under 7 pounds without rings or a finder.

#13 John Rhodes

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Posted 17 April 2012 - 01:15 PM

TV-85 should suit your criteria, although I forget the tube weight. It's a great ultraportable scope.

6.1 LBS. OTA
8 LBS. with included 2"diagonal, 1.25 adapter, 20 mm Plossl eyepiece,
and tube clamp ring.

#14 EdZ

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Posted 17 April 2012 - 03:12 PM

I think you'd be surprised how rapidly the weight climbs

The TMB SS80CF (carbon fiber tube) is a light weight scope. The optics are outstanding.

The scope itself with a two speed 2" feathertouch focuser (as supplied) weighs 5# 4oz. (not the 4#3oz. listed), and that is without the objective lens cap.

With 2" Astro tech dielectric diagonal it is 6# 4oz.
With the supplied rings and short vixen style dovetail it it 8# 2oz.

Stick a 5mm BO/TMB planetary in the focuser and you are up to 8.5#.
Put a 17mm NaglerT4 in there and you are up 9.75#.

edz

more

the TV85 with no diagonal, rdf or lens cap, but including clamshell weighs in at 6#14oz.
AT diagonal weighs 1#.

Both of these scopes with rings, diagonal, RDF and a 17mmT4 weigh ~10#.



#15 Scott in NC

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Posted 17 April 2012 - 06:18 PM

LOMO 80/480 from Stellarvue sould do it.


Awesome scope, but it's not very light. I haven't weighed mine, but I'm sure it's got to be at least 8 lbs (with clamshell ring, but not including diagonal or EP).

#16 Scott in NC

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Posted 17 April 2012 - 06:23 PM

I personally prefer aluminum OTAs to carbon fiber OTAs, but if you really want to keep your scope under 8 lbs, including diagonal and EP, then a CF tube is probably your best bet.

#17 Scott Beith

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Posted 17 April 2012 - 09:38 PM

http://www.stellarvue.com/svr80ed.html

5.5 lbs with the mounting ring.

Doublet ED

#18 Arizona-Ken

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Posted 17 April 2012 - 10:04 PM

http://www.stellarvue.com/svr80ed.html

5.5 lbs with the mounting ring.

Doublet ED


I have one of these - great scope. I piggyback it on my CPC1100 in usual use, although I do use it as a grab and go and sometimes on camping trips.

Arizona Ken

#19 Kon Dealer

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Posted 18 April 2012 - 01:44 PM

Kson 1026ED f/6 carbon fibre version.
Now sold under the name "Ekinox"
http://www.teleskop-...-ED1026::8.html
Got one of these second hand. The OTA only weighs 5.7lbs.
With CNC rings, 1.25" diagonal and typical EP your looking at 8.3lbs.
Very little CA as well for a f/6 ED doublet.

It is making my Megrez 90 look redundant.
None that I can detect in focus on Jupiter and very little on Venus.

#20 Scott in NC

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Posted 18 April 2012 - 02:35 PM

Hi Kon Dealer,
I'm not doubting you, but that's really quite a feat for a 4" ED doublet as fast as f/6 to show such little chromatic aberration. I wonder what type of glass it uses? I don't know if the OP plans to use the scope for visual or imaging. My guess is that the scope you recommended may be adequate for visual, but probably not quite as pleasing for imaging use. Just my guess though, as I've never seen nor used the scope in question.

#21 Kon Dealer

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Posted 18 April 2012 - 03:18 PM

ssatko.
It uses FLP53.
The previous owner sold it on because it showed CA when imaging.
It's fine for me, I'm purely visual. :)

#22 Scott in NC

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Posted 18 April 2012 - 03:37 PM

Cool--good to know that there are plenty of options out there! Hopefully the OP will come back to let us know other details, like his intended application for the scope, approximate budget, etc.

#23 skysurfer

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Posted 12 May 2013 - 03:13 AM

What I wonder is that *all* APOs are equipped with a superheavy 2" or even larger focuser. When you want to use it visually, a 1.25" focuser saves at least 500g (1lb). Those short refractors provide a wide enough field with small eyepieces such a TV Panoptic 24. Moreover, the bulky 2" EPs(particular Ethos jars) contribute a lot to the overall weight. They are better suited for SCTs or long refractors.


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