Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

stargazine_ep33_banner.thumb.jpg.75d09b4b1b4e5bdb1393e57ce45e6a32.jpg

johninderby

TS-Optics 8" f/12 Cassegrain telescope 203/2436 mm OTA

Recommended Posts

On 12/10/2019 at 10:46, johninderby said:

Minor jobs. 🙂

Got the finder aligned and found I needed the two inch spacer added to focus on something a mile away. 

Found the front cover was a bit awkward to remove as there was nothing to grab and it is a snug fit. So off to the spare parts box for a black stainless steel knob to attach to the cover. Much better. 👍🏻

0B80EAD7-F1F8-47A2-AE17-03F531FCB422.jpeg

1F7AD099-B557-4B27-9AF1-AE8DC07318AB.jpeg

I took the plunge and invested in one of these too - just arrived today. Very nice indeed. One thing I noticed about the front cover is that it 'locks' in place by twisting once placed into the OTA. Its about a 10 to 20 degree twist to 'lock' and 'unlock'.

Share this post


Link to post
Share on other sites
12 minutes ago, Lamplighter05 said:

I took the plunge and invested in one of these too - just arrived today. Very nice indeed. One thing I noticed about the front cover is that it 'locks' in place by twisting once placed into the OTA. Its about a 10 to 20 degree twist to 'lock' and 'unlock'.

Good to see another CC owner. 👍🏻👍🏻👍🏻

Yes I was impressed with the build quality of it. Very solid scope.  One thing I found was that sometimes it was difficult to remove the cover if you overtightened it  Hence the knob. 

Share this post


Link to post
Share on other sites
16 hours ago, johninderby said:

Good to see another CC owner. 👍🏻👍🏻👍🏻

Yes I was impressed with the build quality of it. Very solid scope.  One thing I found was that sometimes it was difficult to remove the cover if you overtightened it  Hence the knob. 

Indeed, as I already had an TS APO 80mm triplet refractor and am very happy with the build of that, I was really happy to see, and conformed via your thread here this was my next option as opposed to a Mak. I'm looking to the autumn and winter for most of my telescope time ... dew and temperature plus CA my main concerns. Funnily, the CC I received has a red front tube baffle from the current RC as advertised. I did check I hadn't got some factory 'Frankenstein' hybrid - seems not - only cosmetic! Lol. My next 'investment' will be some Vixen to Losmandy mounting saddle, so I can use the broader rail on the mount side rather than the Vixen bar. I think your lid solution is a great addition.

Separately did you tweak the collimation in the end, if so what method did you use? Cheers for any info.

Share this post


Link to post
Share on other sites

I played around with the collimation just to see how you went about collimating it but the collimation was OK as delivered but now I know how to do it. Once you understand how to collimate it it is actually quite simple as explained in the manual. Don’t know why TS doesn’t provide a manual. 🤔

https://nimax-img.de/Produktdownloads/62478_1_Anleitung-EN.pdf

  • Thanks 1

Share this post


Link to post
Share on other sites

Still on the fence about this and the Skymax 180. I don't like the spider vanes and the resulting diffraction pattern, but I suppose that for planetary observation and imaging these aren't a problem.

I have seen that the Omegon brand version is cheaper than the TS one, I wonder if there's any quality difference? Or different accessories? Also, the GSO site doesn't mention the classic Cassegrain series at all.

As I live in Athens, Greece dew and cold aren't usually a problem. Would a few shield be useful as a stray light block, though?

Since I have a HEQ5 mount, I suppose that I'll have to reverse the mounting rails in order to have the guide scope on top, right? Does this involve cutting holes as well?

Cheers,

N.F..

 

Edited by nfotis

Share this post


Link to post
Share on other sites

Throwing my hat in the ring.

Took delivery of a TS 8” Classical Cassegrain yesterday at 11am and had first light of Venus and crescent moon within an hour😀
I got it from Teleskop Service in Germany and pretty happy with scope and their service.

First problem is the OTA being 8.9Kg as opposed to the 7.5Kg advertised, have asked them to rectify this on the website for the benefit of others. Maybe without focuser and/or rails 7.5 is correct.

Second one, actually more of a ‘Doh!’ moment was spotting the StellaLyra at about £200 cheaper😢 I’ve convinced myself that this is because the StellaLyra claims 95% reflectivity of the mirrors and TS 99% (mmmm, they got the weight wrong so maybe...?)

Looking at the other manifestations of this beast (iOptron, GSO, Orion et al) 96% seems to be the usual figure which means I’m clinging to the hope that when these companies order their paint livery etc. from the factory in China, they either specify the coatings they want on the mirrors (to suit budget and pricing etc.) or coat the optics themselves.🤞

The scope is an ‘upgrade’ from my pristine 18 year old Intes MK67 (which I’ll be selling). The easier to handle and vastly cheaper 6” may have been a more suitable choice😢

But this scope seems very promising, just hope to goodness I don’t drop it.

Enough for now, it’s been a good distraction to losing a very close friend to Covid on Tuesday.

Keep safe everyone.

06738E2E-C3E4-479B-A7AA-75FD1A05796C.jpeg

  • Like 1
  • Thanks 1

Share this post


Link to post
Share on other sites

A handle really helps.

The ADM is expensive bit fits right onto the dovetail on the top.

https://www.firstlightoptics.com/adm-misc-mounting-accessories/adm-dovetail-handle-vixen.html

The WDS handle is great though and much cheaper.

https://www.wdscomponents.com/en-gb/tubed-handle-front-mounted-black-wds-8517/c-404/p-920

 

  • Haha 1

Share this post


Link to post
Share on other sites
43 minutes ago, johninderby said:

A handle really helps.

The ADM is expensive bit fits right onto the dovetail on the top.

https://www.firstlightoptics.com/adm-misc-mounting-accessories/adm-dovetail-handle-vixen.html

The WDS handle is great though and much cheaper.

https://www.wdscomponents.com/en-gb/tubed-handle-front-mounted-black-wds-8517/c-404/p-920

 

Thanks JohninDerby, definitely going to fit something to help with the handling. Yes the WDS website is almost porn to me! Wonderful fittings to behold.👍🙂

Share this post


Link to post
Share on other sites
5 minutes ago, AstroNeb said:

Thanks JohninDerby, definitely going to fit something to help with the handling. Yes the WDS website is almost porn to me! Wonderful fittings to behold.👍🙂

Yes you can’t help adding a few extras that might come in handy while perusing the WDS website. 😁

Share this post


Link to post
Share on other sites

Last days, I try to adjust the collimation of my telescope. But I don't understand somethings.

When I use 3 screws on the secondary mirror, it's possible to adjust the collimation.

But is it possible to adjust the primor mirror ?

Behind the telescope there is 3 pairs of screws. How do these screws work ? Do they adjust the primor mirror or adjust the axe of the focuser ?

I ask you this because, when i adjusted the colimation, last time, I saw a little astigmatisme.
Do you know how to remove this astigmatisme, or decrease it ?

Do you tested it ?
Do you have some information to help me ?
 

Share this post


Link to post
Share on other sites

@johninderby,

Thanks. I have this manuel.

But i don't undestand.

The "Optical Axis (Primary Mirror) Adjustment" don't work on the primary mirror directly, but on the axis of extension rings and focuser. Are you alright with me ?

My question is: when we adjust the optical axis, the position between secondary mirror and primary mirro is it différent or is it the same ? So, the position of extension rings and focuser change from mirrors ?

 

 

 

Share this post


Link to post
Share on other sites

The adjustment screws around the back of the scope adjust the tilt of the primary mirror. The distance between the primary and secondary stays basicly the same as you will omly be making very small adjustments. 

These screws don’t adjust the tilt of the focuser / extensions.  To adjust the tilt of the focuser you need to add a tilt adjuster. 

https://www.teleskop-express.de/shop/product_info.php/info/p4272_TS-Optics-M90-Tilting-Adapter-Flange-for-astrophotography.html

I originaly thought these screws did adjust the tilt but have now found out that they don’t.

  • Thanks 1

Share this post


Link to post
Share on other sites

Thanks @johninderby,

I think that you exactly undestood my problem.

7 hours ago, johninderby said:

These screws don’t adjust the tilt of the focuser / extensions.  To adjust the tilt of the focuser you need to add a tilt adjuster. 

https://www.teleskop-express.de/shop/product_info.php/info/p4272_TS-Optics-M90-Tilting-Adapter-Flange-for-astrophotography.html

The element with 3 pairs of screw on the back of the scope look like to this tiltin adapter flange. That's why I believed it.

Thanks so much. Next time I'll try to adjust the primary mirror too. 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.