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Old 10-01-2019, 11:52 AM
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Lognic04 (Logan)
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80mm scopes

Hi all,
I am seriously considering swapping my newt for an 80mm range scope for portability reasons. I have narrowed it down to a TS 80mm f6 triplet plus 0.79 reducer. It is within my price range after selling my MT160. This is not 100% yet though Lewis!

I looked at other options, eg esprit and sv70, which are too expensive, and a wo gt81 which has iron cross problems. Obviously tak is way too expensive!

So, what does everyone think about the TS triplet?
Thanks!
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Old 10-01-2019, 12:27 PM
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The TS 80mm triplet would be a fine scope, though because it's just over the $1000 limit you'll likely need to pay an extra couple hundred in gst and fees.

If you're going over the gst limit anyway you might also consider the TS115 f/7 triplet which is a great value.

Alternatively you could stay under the limit and opt for the TS 72mm FPL53 doublet; images on astrobin look good and I should have a sample image in a couple of days to check for CA (I just bought the 72 for widefield).

GST is only applied under $1000 if the business sells more than $75000 annually to Oz.
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Old 10-01-2019, 12:38 PM
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Thanks Tony. My idea is 3-500mm FL range, so the 115 kind of makes no sense. Also I'd prefer fast eg f5/4
I think I should be ok to pay the 10% get or whatever it is?
Thanks anyway!
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Old 10-01-2019, 05:00 PM
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Are there any other reasonable brands I missed to look into?
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Old 10-01-2019, 05:24 PM
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The only way you're likely to find a better deal than the TS options is to buy used in the classifieds.

The TS focuser is quite good and has a 63mm female thread which a reducer can be attached to.

The adjustable WO Flat 6A II is what I use with my TS115 - it screws straight on and you can mount a 48mm filter internally. I hope to test it tonight with the new TS72.
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Old 10-01-2019, 05:30 PM
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TS also makes a screw in reducer/flattener which takes the f6 to f4.7, which is great. What's adjustable about the WO flattener?
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Old 10-01-2019, 05:40 PM
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The reducer to chip distance is adjustable via a threaded section and lock nut - very convenient for use with different scopes. It's a 0.8 reducer so it takes f/7 or f/6 to f/5.6 and f/4.8 respectively.

It's also not too pricey at US$200: https://williamoptics.com/products/a...t-not-included

It's listed for a variety of scopes but I can only personally confirm that it works with the TS115 atm.
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Old 10-01-2019, 05:44 PM
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This is the one I was looking at: https://www.teleskop-express.de/shop...otography.html
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Old 10-01-2019, 05:59 PM
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Probably the same optics in a different body. I like the WO one better as it's cheaper and adjustable and it connects via an M63 thread.

A lot of gear is produced by a few Chinese companies and rebranded by many resellers.
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Old 10-01-2019, 07:21 PM
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Quote:
Originally Posted by Lognic04 View Post
There are two versions of the Photoline Reducer Corrector, a 2" and a 3" one. I have the 3" one and it has been used constantly on my TS115 and TS80 scopes. You need to buy the m63 to m68 adaptor which allows you to screw it directly to the 2.5" R&P focuser tube (you unscrew the screw clamp section to attach the reducer corrector.
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Old 10-01-2019, 07:44 PM
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Thanks Glend, the TS site says that the tsred 3" has a m63 thread and so does the 80mm, is that correct?
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Old 10-01-2019, 09:54 PM
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Originally Posted by Lognic04 View Post
Thanks Glend, the TS site says that the tsred 3" has a m63 thread and so does the 80mm, is that correct?
The 3" reducer corrector requires M68, hence that is why you need the M63 to M68 adaptor.


https://www.teleskop-express.de/shop...otography.html

This adaptor

https://www.teleskop-express.de/shop...le-thread.html
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Old 10-01-2019, 09:59 PM
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If you can find one, Explore scientific also has a fast 80mm triplet. Meade's are also available albeit just a rebadged more expenive explore scientific.
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Old 11-01-2019, 09:27 AM
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Thanks Glend. does the 2.5 focuser rotate?
Tony, thanks for that. I think all the scopes in this price range are similar (Chinese optics), but I will look into it
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Old 11-01-2019, 10:39 AM
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Originally Posted by Lognic04 View Post
Thanks Glend. does the 2.5 focuser rotate?
Tony, thanks for that. I think all the scopes in this price range are similar (Chinese optics), but I will look into it
That particular model, no I don't believe it does rotate. You can tell by the photo of the rear of the scope. The R&P focusers which rotate have a lock knob on top near where the focuser attaches to the scope tube. However, TS does offer a rotation collar/adaptor which would replace the M68 to M63 adaptor discussed below:

https://www.teleskop-express.de/shop...54-and-2-.html

I have one of these adaptors, which I might consider selling (as my TS115 focuser rotates). I sold my TS80 a couple of months ago in my collection downsizing, so I don't need that rotating adaptor anymore (but it could be used on the TS115 as well).
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Old 11-01-2019, 12:43 PM
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Thanks. Question for the tak folks, can I image with a fs-78 and sky 90 reducer? It's a bit slow, but is it possible? I don't know if imaging at f6.5 vs 4.7 is a good idea though.
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Old 11-01-2019, 01:09 PM
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Quote:
Originally Posted by Lognic04 View Post
Hi all,
I am seriously considering swapping my newt for an 80mm range scope for portability reasons. I have narrowed it down to a TS 80mm f6 triplet plus 0.79 reducer. It is within my price range after selling my MT160. This is not 100% yet though Lewis!

I looked at other options, eg esprit and sv70, which are too expensive, and a wo gt81 which has iron cross problems. Obviously tak is way too expensive!

So, what does everyone think about the TS triplet?
Thanks!
What's wrong with the newt?
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Old 11-01-2019, 01:40 PM
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Nothing! I just want to change to widefield as I'm more interested in nebulae.
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Old 11-01-2019, 02:12 PM
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Don't knock doublet ED's either! They're much much cheaper and affordable. Especially if you're using a monocamera, as long as you focus between each colour. Zero difference if you're shooting narrowband.
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Old 11-01-2019, 02:18 PM
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Nothing! I just want to change to widefield as I'm more interested in nebulae.
You get ~800mm FL with the reducer. An ED80 will be around 600mm. Your scope is a lot faster and optical quality much better. I've had an ED80 and TS 90mm APO CF triplet. TBH I'd stick with the TAK.
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