NEW StellaMira 90mm ED Triplet Refractor

[Chris]

First look video below (sorry about the intro, I just like playing around with green screen effects)

 

[Stu]

Great video @Chris, looks like a fabulous little scope. I’m sure it is imaging biased, but as has been said, it should make a ideal airline portable visual scope too. Looking forward to hearing how you get on with it.

[Alan White]

On 15/10/2021 at 00:04, Sunshine said:

Aw c'mon! we're not talking nuclear submarine propulsion systems here!

So no Peanut Butter sandwiches are required 🤣

[Chris]

1 hour ago, Stu said:

Great video @Chris, looks like a fabulous little scope. I’m sure it is imaging biased, but as has been said, it should make a ideal airline portable visual scope too. Looking forward to hearing how you get on with it.

Thanks Stu  and further to the airline portable side of things, I must confess that I forgot to push the rings back as far as they will go! Doing so shortens the scope by a further 1cm when the dew shield is pushed in. The Stellalyra 90mm will go as short as 46cm not 47cm..every little helps

[Chris]

1 hour ago, Alan White said:

Aw c'mon! we're not talking nuclear submarine propulsion systems here!

Well Alan, if we can market the Zarkov cloud gun, Jaffa cake tube Heritage 100p's, and the Hubble space telescope, we can add nuclear propulsion to a telescopes also 🤣

[Adam J]

9 hours ago, Chris said:

First look video below (sorry about the intro, I just like playing around with green screen effects)

 

Any chance of a closer look at the optical report? 

[Chris]

26 minutes ago, Adam J said:

Any chance of a closer look at the optical report? 

No problem Adam, here you go  

 

[nfotis]

Wondering if this 1x flattener (or a similar) would be suitable match for people who want the longer focal length:

https://www.teleskop-express.de/shop/product_info.php/language/en/info/p10307_TS-Optics-REFRAKTOR-1-0x-Flattener-Bildfeldkorrektor---2--Anschluss.html

N.F.

EDIT. Or maybe this 2.5" flattener?

https://www.teleskop-express.de/shop/product_info.php/language/en/info/p10264_TS-Optics-REFRACTOR-1-0x-Flattener-for-Full-Frame-Sensors---M63x1-connection.html

 

 

Edited November 8, 2021 by nfotis

[FLO]

The TS 2" 1x Field Flattener you link to at the German website is in stock at FLO and will work nicely with the StellaMira 90 f6 Triplet. 

The other TS flattener should also work but note the comments about spacing for 500mmFL to 600mm FL refractors. 

HTH

[Ouroboros]

It looks very good. I’m tempted!  Very good video that, Chris. I look forward to the second part. 

[SAW]

Any more reviews on these especially for imaging ? I'm wanting to order one but would like to hear some thoughts on it for imaging and to see some images.

[johninderby]

The scope was only released about a month ago and I see that they have sold 18 so I’m sure there will soon be more reviews but simply only just getting into users hands so allow a bit more time.

[SAW]

2 hours ago, johninderby said:

The scope was only released about a month ago and I see that they have sold 18 so I’m sure there will soon be more reviews but simply only just getting into users hands so allow a bit more time.

Must be a few users that are abroad where it's not cloudy every night like the UK 😄

[Martthebass]

Sadly mine's still sat in it's box awaiting a couple of days with some clear night sky so that I can give it a proper run.  With the short stretches of clarity I had over the weekend I kept the GT71 set up.

[FLO]

On 13/11/2021 at 17:31, SAW said:

Any more reviews on these especially for imaging ? I'm wanting to order one but would like to hear some thoughts on it for imaging and to see some images.

 

On 13/11/2021 at 17:39, johninderby said:

The scope was only released about a month ago and I see that they have sold 18 so I’m sure there will soon be more reviews but simply only just getting into users hands so allow a bit more time.

John is right, it was launched only one month ago but sales are good so we are confident we will soon see images posted by owners at SGL. 

We will also soon have a StellaMira 90 ED triplet in use at our observatory in Spain 🙂 

[FLO]

Based on sales so far we are predicting our first batch of StellaMira 90 ED triplet telescopes will sell out around Christmas.

Another batch has been ordered but these are extraordinary times so we cannot be sure when they will arrive. 

HTH, 

Steve 

[Chris]

I need to get a full frame camera on StellaMira at some point, however hopefully this quick video gives some idea of how well the dedicated 0.8 reducer/flattener works when simply used with a T-ring and APS-C crop sensor camera.  No messing with spacing. 

 

[Marin]

Thank you for sharing and please do try to get hands on a full frame camera, while the quality across a crop sensor is great we need to know how well it performs on larger sensors. For pixel peepers, here is an image of double cluster i took with my Fuji xt-4, 10x1s stack.

[Chris]

Quick first light image with StellaMira 90 EDT + 0.8 RF + Fuji XT1 - Triangulum Galaxy M33 

1) Single 2 minute exposure 

2) 30 x 2 minutes processed in GIMP (no flats darks, filters etc so fairly rustic)  

 

[Martthebass]

Similar slightly hazy sky at my end, same subject; 30 x 180s subs.  I bought the FF/FR but not sure that it was entirely necessary on the small format ASi 533MCP.  That said it will future proof me for something bigger in the future 😁

[Chris]

Another crack at the StellaMira data... The core was a bit blown out on the first rendition:

 

 

 

 

Edited November 27, 2021 by Chris

[rsarwar]

19 hours ago, Chris said:

Another crack at the StellaMira data... The core was a bit blown out on the first rendition:

 

 

 

 

Hi chris, great video. and great images.

Looking at the flattener, it looks like it is a similar to the TS flattener that they put up with their 90mm f6. on one of the diagrams on the TS website, it is suggested that tthe M48 thread is actually on an extension which can be taken off. is that the same in the Stellemira flattener as well?  if yes, what is the thread on the camera side once the M48 extension is taken out and how much does it increase the backfocus. i kinda need the extra space. :S

Also, would it be possible to maybe upload a white using a full frame dslr or something similar please. 

 

Thanks

[Chris]

3 hours ago, rsarwar said:

Hi chris, great video. and great images.

Looking at the flattener, it looks like it is a similar to the TS flattener that they put up with their 90mm f6. on one of the diagrams on the TS website, it is suggested that tthe M48 thread is actually on an extension which can be taken off. is that the same in the Stellemira flattener as well?  if yes, what is the thread on the camera side once the M48 extension is taken out and how much does it increase the backfocus. i kinda need the extra space. :S

Also, would it be possible to maybe upload a white using a full frame dslr or something similar please. 

 

Thanks

Thank you!  

Unscrewing the knurled M48 adapter on the camera side buys you an extra 5mm and reveals a 63mm male thread on the reducer/flattener.

The TS version appears to come with an additional adapter on the telescope side, whereas the StellaMira ends with another male M63 thread for attaching directly to the StellaMira 90 EDT.

I would like to do some full frame testing, I just need a full frame camera firstly.

I may look on MPB.com to see how much their most affordable Full frame is, hmm? : )  

Cheers

Chris

 

TS:

StellaMira:

 

Edited November 28, 2021 by Chris

[rsarwar]

22 minutes ago, Chris said:

Thank you!  

Unscrewing the knurled M48 adapter on the camera side buys you an extra 5mm and reveals a 63mm male thread on the reducer/flattener.

The TS version appears to come with an additional adapter on the telescope side, whereas the StellaMira ends with another male M63 thread for attaching directly to the StellaMira 90 EDT.

I would like to do some full frame testing, I just need a full frame camera firstly.

I may look on MPB.com to see how much their most affordable Full frame is, hmm? : )  

Cheers

Chris

 

 

 

Thanks chris. 5 mm is great as i got a wierd BF combo: QHY268 (12.5+1.8) -> M54 F (4 mm) -> M54 M to M54 M (2 mm) -> ZWO 2in EFW (20 mm) -> ZWO M68 (17.5) -> M68 F to M63 F (1 mm) = 59 mm. 

Have you tried using a OAG with a APS-C sensor.  i think it should give you a good indication if the image circle is big enough to cover Full frame as well, because APSC diagonal + 8 mm prism would amount to 35 mm more or less? 

I was about to place an order when i spotted that FLO has a ex-demo RC on promotion as well. no i am so confused as if i buy two scopes at once, i will no be allowed inside my bedroom 

Edited November 28, 2021 by rsarwar

[Grant]

30 minutes ago, rsarwar said:

Thanks chris. 5 mm is great as i got a wierd BF combo: QHY268 (12.5+1.8) -> M54 F (4 mm) -> M54 M to M54 M (2 mm) -> ZWO 2in EFW (20 mm) -> ZWO M68 (17.5) -> M68 F to M63 F (1 mm) = 59 mm. 

Have you tried using a OAG with a APS-C sensor.  i think it should give you a good indication if the image circle is big enough to cover Full frame as well, because APSC diagonal + 8 mm prism would amount to 35 mm more or less? 

I was about to place an order when i spotted that FLO has a ex-demo RC on promotion as well. no i am so confused as if i buy two scopes at once, i will no be allowed inside my bedroom 

I’m using it with the 2600 and an OAG and it works great, had to be careful to get the OAG on the long side of the sensor and pull it out a little to get it in a good position but I’m happy with it now 🙂