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New 20" f3.3 Sky Vision UC scopes

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#1 PeterWar

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Posted 03 March 2013 - 04:16 PM

Hi guys,

Have you seen this? Sky Vision is now making f3.3 scopes! :jump:

http://www.skyvision...c-series/?la...

To me the 20" f3.3 seems to be a perfect fit for my next scope, I wander however if it could be transportable by a single person as the website states.

#2 Bob S.

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Posted 03 March 2013 - 04:54 PM

I was vacationing in Paris this past September and saw one of their scopes at La Maison de l’Astronomie. They appeared to be very nicely built scopes. The astronomy store was only selling the structures so I know nothing about their optics. Bob

#3 GeneT

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Posted 03 March 2013 - 06:34 PM

This telescope looks like it might be one to consider if one wants/likes the Ultra Compact design.

#4 PeterWar

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Posted 03 March 2013 - 07:10 PM

It is important to know what kind of optics do they use, haven't seen much information arround.

Add a 3.3 1.25" thick Lockwood Quartz mirror to this setup and a dream scope is born! :)

#5 Bob S.

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Posted 03 March 2013 - 07:36 PM

It is important to know what kind of optics do they use, haven't seen much information arround.

Add a 3.3 1.25" thick Lockwood Quartz mirror to this setup and a dream scope is born! :)


Peter, You are soooooo right. A 20" f/3.3 Lockwood would be the bomb in this scope. While I was looking over this structure in Paris, Mike Lockwood was putting the finishing touches on my 20" f/3.0 1.25" thick mirror which went into my new JP Astrocraft scope along with a Lockwood 5" secondary.

Gene, I know that you kind of got burned on a UC scope here in the States. When I played with the movements of the scope in Paris this past year, I was very pleasantly surprised at how nicely they moved. They seemed pretty rigid from what I could gather in my very brief encounter. In fact, it was really the only interesting thing I saw in the shop. I was looking for a Leica ASPH at the time but they did not carry them. I think they had a mirror in the demonstrator in order for it to be properly balanced which it was IIRC. I think the scope I played with was an f/4? I cannot remember how big it was? You would think with my poor recall of the event that I was drinking too much French wine but I gave up alcohol about 1.3 years ago. I hope it is not old age :question: Bob

#6 Sgt

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Posted 03 March 2013 - 09:59 PM

Carbon fibre and aluminium - that seems very high tech for a dob.

Those quick release fasteners look like a very neat idea.

#7 Fireball

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Posted 04 March 2013 - 06:59 AM

Any idea of the price tag for the 20"?

#8 Sgt

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Posted 04 March 2013 - 09:50 AM

According to this, 9990 Euro for the f/4 20incher, so probably a few hundred more the f3.3 I guess.

http://www.maison-as...250-uc-f-5.html

#9 PeterWar

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Posted 04 March 2013 - 05:00 PM

Don't know if the price includes the optics, seems so.

Would be nice to know how thick is the mirror and if they offer wheelbarrow handles.

#10 GeneT

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Posted 05 March 2013 - 12:19 AM

Gene, I know that you kind of got burned on a UC scope here in the States.


I would be interested in someone testing the new Sky Vision to see how it holds collimation. That was a big problem with my previous UC. With an F3.3 mirror, maintaining collimation will be very important.

#11 PeterWar

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Posted 09 March 2013 - 11:59 AM

I've found a picture of it, looks sweet!

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#12 Sgt

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Posted 09 March 2013 - 02:22 PM

Mmm looks like a conference, where was that taken?

#13 DSobserver

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Posted 09 March 2013 - 03:15 PM

Hi,

this picture was taken in the french astronomy exhibition that take place in Paris each 2 years : 4 days, 150 conferences and many astroshop exhibitions
here some more pictures : http://www.webastro....ad.php?t=100952
http://www.afanet.fr.../CR-RCE2012.Pdf

Skyvision is certainly today the best french "handmade" telescope producer : http://www.skyvision.fr/

the 500mm f4 cost 5690€ without optic and

UC version 500mm F3.3 cost 11890€ + 5290€ for primary mirror

bit costy, but waowww they are great!!!

#14 Sgt

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Posted 09 March 2013 - 03:18 PM

Do you have one?

#15 Sgt

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Posted 09 March 2013 - 03:21 PM

wait a minute, are you saying the 500mm f4 (non-UC ?) costs 5690euro without an optic but the 5000mm f3.3 UC without optic costs 11890euro??

#16 DSobserver

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Posted 09 March 2013 - 04:02 PM

uups
I double check
500 f4 UC with optic cost 11890 and link to mirror prices, I think that f3.3 should cost around 300€ more.

unfortunately I don't have it.

By the way here 2 other great french dobson makers :
http://www.vs-astro.com/452.html
https://sites.google...y/dobson-600-mm

#17 Sgt

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Posted 09 March 2013 - 04:45 PM

Ah that seems a little more realistic. But the in the link in my first post in the thread the 500mm UC is 9990 euro...

#18 PeterWar

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Posted 10 March 2013 - 03:30 PM

What's the weight of the heaviest part? can't figure out the total wait of the cell+mirror box of the 20" UC

#19 DSobserver

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Posted 11 March 2013 - 01:02 PM

50kg for the mount + 22kg for optics

#20 PeterWar

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Posted 11 March 2013 - 07:10 PM

22Kg only for the mirror cell? thats A LOT :crazy:

#21 Nodinute

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Posted 20 May 2013 - 02:13 PM

If you want to see more pics of this T500 f/3.3 you can have a look on their blog here : http://www.skyvision...blogus/?lang=en
As far as I know Skyvision have their own optics made in their workshop ant it seems that they are quite really good optics. Here is a test report of the T500 f/3.3 made by an independant lab (didn't find the english version of this test on the website...). Finally, I join a pic of the T500 taken during the Astronomy Show in Paris end of last year...really compact this dob :)

Attached Files



#22 Sgt

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Posted 20 May 2013 - 02:38 PM

I saw the 20in f3.3 at the international astronomy show in Warwickshire, England at the weekend. First time I've seen a high quality dob in the flesh, I was impressed. Aluminium mirror box, wood bearings and those natty carbon fibre and red anodised aluminium truss poles. It had a 2in (I should say 50mm) thickness mirror.

It was a thing if beauty.

#23 Thomas Karpf

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Posted 20 May 2013 - 02:39 PM

uups
I double check
500 f4 UC with optic cost 11890 and link to mirror prices, I think that f3.3 should cost around 300€ more.

unfortunately I don't have it.

By the way here 2 other great french dobson makers :
http://www.vs-astro.com/452.html
https://sites.google...y/dobson-600-mm


I think you are wildly optimistic in your estimate for the difference between f/4 and f/3.3. A thousand or more would seem likely. Mirrors that fast are quite difficult to figure accurately.

#24 Nodinute

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Posted 20 May 2013 - 03:03 PM

well done :D...59mm exactly....(seen on the optical test report).
Public price for the 20" f3.3 is 8.903 Eur (wo VAT)...or 11.500 USD (with optics). Here is the complete price list available on the website (downloads).
And have no worry about how it keeps the collimation...I had one of their 12"UC and never had a problem with it.






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