112 replies to this topic

[Terry Smith]

Almost three weeks after I ordered, I got to see first light with my new TS-Optics CF 90mm f6 APO telescope. Long story short...I'm very impressed.

 

My first choice was finding a used TMB 92. No way that would happen. Then I called Astronomics and they told me the AT92 was a couple months from being in stock. I looked at the William Optics FLT 91 ($1998) and the StellaMira 90mm f6 carbon tube APO at about 1449 British pounds, or $1995 US. The TS 90mm was about $1630, which includes the scope price, DHL shipping from Altair Astro in England and the VAT tax ($103).

 

The StellaMire 90mm f6 APO and the TS 90mm f6 APO appear to be the same telescope except for the tube material and ED glass. StellaMire's ED is FPL-53. The TS 90mm f6 APO is FPL-55. Roland Christian says they are very close to the same except the FPL-55 is easier to work.

 

My TS 90mm's test report, serial # 040, states my scope has a strehl of .972. I'm very happy with that. And the results certainly show it. The star test was really excellent. The moon was totally color-free and very sharp tonight before the clouds rolled in. The triple star Beta Monoceros was a beautiful split at 200x...and the seeing was a 7 at best. For a 90mm telescope with a 540mm FL, I'm pleased.

 

The materials used to build this scope are top grade. Everything is quality, just like the AT92. The scope is surprisingly heavy. The only thing I did not care for is the 2" to 1.25" eyepiece adapter that came with the scope. It is a twist-to-tighten unit and a pain to use so I replaced it with a normal set-screw compression ring type. 

 

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[ICit2]

Congrats on that TS90!   My experience with TS has been very good.  I've been in the same market for a 90 also.  Looked at the present contenders but I can't seem to pull the trigger on any of them with a TS 80 f/6.8 Quintuplet Apo with field flattener in the stable. Maybe one day.

[Thomas_M44]

Almost three weeks after I ordered, I got to see first light with my new TS-Optics CF 90mm f6 APO telescope. Long story short...I'm very impressed.

 

My first choice was finding a used TMB 92. No way that would happen. Then I called Astronomics and they told me the AT92 was a couple months from being in stock. I looked at the William Optics FLT 91 ($1998) and the StellaMira 90mm f6 carbon tube APO at about 1449 British pounds, or $1995 US. The TS 90mm was about $1630, which includes the scope price, DHL shipping from Altair Astro in England and the VAT tax ($103).

 

The StellaMire 90mm f6 APO and the TS 90mm f6 APO appear to be the same telescope except for the tube material and ED glass. StellaMire's ED is FPL-53. The TS 90mm f6 APO is FPL-55. Roland Christian says they are very close to the same except the FPL-55 is easier to work.

 

My TS 90mm's test report, serial # 040, states my scope has a strehl of .972. I'm very happy with that. And the results certainly show it. The star test was really excellent. The moon was totally color-free and very sharp tonight before the clouds rolled in. The triple star Beta Monoceros was a beautiful split at 200x...and the seeing was a 7 at best. For a 90mm telescope with a 540mm FL, I'm pleased.

 

The materials used to build this scope are top grade. Everything is quality, just like the AT92. The scope is surprisingly heavy. The only thing I did not care for is the 2" to 1.25" eyepiece adapter that came with the scope. It is a twist-to-tighten unit and a pain to use so I replaced it with a normal set-screw compression ring type. 

That’s a *very* nice looking little scope Terry 

 

90mm is a good convenient size. The triplet should tame CA quite well.

 

I look forward to further reports of your results.

[Avgvstvs]

Lovely bit of gear, hope you will share some images when the weather clears.

[gzljh96]

There are some rumours that the WO FLT91 is in fact using the same objectives — all produced by Kunming United Optics.

The StellarMira is the same scope as the TS. It was £150 cheaper before the new year and I sort of regret that I didn’t go for it.

The AT92 is a different objective but uses the same/similar tube and focuser.

Either way, I’ve only heard good things about the TS CF-APO 90, usually from photographers with very high expectations. If the APO is good for them with their small pixel astrocameras, then it should a great visual scope too!

[Astro Des]

Terry, the Stellamira is NOT FPLl53 it is FPL 55 I own one. If it were 53 they would disclose this fact.

Steve at FLO confirmed this in the Stargazers Lounge forum I believe.

 

Almost three weeks after I ordered, I got to see first light with my new TS-Optics CF 90mm f6 APO telescope. Long story short...I'm very impressed.

 

My first choice was finding a used TMB 92. No way that would happen. Then I called Astronomics and they told me the AT92 was a couple months from being in stock. I looked at the William Optics FLT 91 ($1998) and the StellaMira 90mm f6 carbon tube APO at about 1449 British pounds, or $1995 US. The TS 90mm was about $1630, which includes the scope price, DHL shipping from Altair Astro in England and the VAT tax ($103).

 

The StellaMire 90mm f6 APO and the TS 90mm f6 APO appear to be the same telescope except for the tube material and ED glass. StellaMire's ED is FPL-53. The TS 90mm f6 APO is FPL-55. Roland Christian says they are very close to the same except the FPL-55 is easier to work.

 

My TS 90mm's test report, serial # 040, states my scope has a strehl of .972. I'm very happy with that. And the results certainly show it. The star test was really excellent. The moon was totally color-free and very sharp tonight before the clouds rolled in. The triple star Beta Monoceros was a beautiful split at 200x...and the seeing was a 7 at best. For a 90mm telescope with a 540mm FL, I'm pleased.

 

The materials used to build this scope are top grade. Everything is quality, just like the AT92. The scope is surprisingly heavy. The only thing I did not care for is the 2" to 1.25" eyepiece adapter that came with the scope. It is a twist-to-tighten unit and a pain to use so I replaced it with a normal set-screw compression ring type. 

[Terry Smith]

Terry, the Stellamira is NOT FPLl53 it is FPL 55 I own one. If it were 53 they would disclose this fact.

Steve at FLO confirmed this in the Stargazers Lounge forum I believe.

I stand corrected...thank you.
 

[Spikey131]

This scope came up in another thread regarding binoviewers.

 

How much additional in-focus does the scope have when in focus with a standard diagonal and eyepiece?  A binoviewer would need about 100mm.  Your photo shows the focuser racked out pretty far.

[Terry Smith]

This scope came up in another thread regarding binoviewers.

 

How much additional in-focus does the scope have when in focus with a standard diagonal and eyepiece?  A binoviewer would need about 100mm.  Your photo shows the focuser racked out pretty far.

I was looking at the moon with a Baader prism and a Baader 10mm ortho at the time. It looks to have around 3" of travel (70mm if you go by the scale on the drawtube) left until it bottoms out. Maybe someone else would know.  Altair Astro or First Light Optics (they sell the StellaMira 90mm f6 carbon scope, same optics) might have information on this.

Edited by Terry Smith, 11 February 2022 - 08:43 PM.

[TareqPhoto]

Congratulations!

[paul]

Hello,

Great report! I have one as well and I agree they are great little scopes!

Paul

[mgutierrez]

any other users with this ota? More feedback is very welcome

[TareqPhoto]

any other users with this ota? More feedback is very welcome

The problem with me is that i have so much bad situations that i couldn't return back to imaging or use my new and old gear yet, so i really want to use my 90mm more, specially after i got the dedicated reducer, so i hope i can get back to imaging very soon.

 

So what more feedback do you need? What is exactly you are looking for? The price is really nice compared to other similar aperture scopes, it is like you bought the cheapest of nice quality of this aperture, and i really will buy a second one of this scope later in future to have dual setup.

[mgutierrez]

So what more feedback do you need? What is exactly you are looking for? The price is really nice compared to other similar aperture scopes, it is like you bought the cheapest of nice quality of this aperture, and i really will buy a second one of this scope later in future to have dual setup.

well, was just only asking for more reviews and opinions; since this scope is relative new.
This scope really seems to fit my needs. And the price is really good

[ris242]

 

So what more feedback do you need? What is exactly you are looking for?

More photos and on mounts too.

[TareqPhoto]

well, was just only asking for more reviews and opinions; since this scope is relative new.
This scope really seems to fit my needs. And the price is really good

The problem is, i bought it without any reviews or feedback and i am happy so far.

[TareqPhoto]

More photos and on mounts too.

I can do that later or soon in future, so if the photos are bad because i am not good at all in imaging, is that enough? And mounts what does that mean, so i put it on my mount and take 10 photos of that?

[ris242]

I can do that later or soon in future, so if the photos are bad because i am not good at all in imaging, is that enough? And mounts what does that mean, so i put it on my mount and take 10 photos of that?

I am not an imager.

I'm trying to find more photos of the scope itself and mounted on a tripod etc.

Perhaps put a pen, a battery or a can of coke in a shot to get a idea for the size of it......something in the shot that has a worldwide standard size. :-)

[TareqPhoto]

I am not an imager.

I'm trying to find more photos of the scope itself and mounted on a tripod etc.

Perhaps put a pen, a battery or a can of coke in a shot to get a idea for the size of it......something in the shot that has a worldwide standard size. :-)

Ah i see, i will do that not a problem, i think i did this comparing this scope next to my Askar FRA400 and maybe also next to Canon lens 300mm f2.8, but i will do it again for size scale somehow, sorry i misunderstood your point.

[LeonH]

I got my 90mm CF-Apo with the dedicated x0.8 reducer/flattener in January '22.
I use ASI2600MC with 5x2" FW and EAF and ASI1600MM, 5x1.25" and EAF and Canon 5D3.  i'm running NINA on my setup and mount it on an AZ-EQ6 and Star Adventurer.
I also have an Evostar 72ED-Pro and Astromechanics focuser for all my Canon lenses (lots).

I'm fairly new to AP, i just started in October '21

I really like the large dynamic range of my first (and to date only) light.

It does NOT FULLY enlight the sensor, but it is very close and it can easily be fixed in post with flats.
I'm thinking about trying the 1:1 flattener 

/Leon, Denmark

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Edited by LeonH, 18 February 2022 - 01:53 AM.

[mgutierrez]

I got my 90mm CF-Apo with the dedicated x0.8 reducer/flattener in January '22.
I use ASI2600MC with 5x2" FW and EAF and ASI1600MM, 5x1.25" and EAF and Canon 5D3.  i'm running NINA on my setup and mount it on an AZ-EQ6 and Star Adventurer.
I also have an Evostar 72ED-Pro and Astromechanics focuser for all my Canon lenses (lots).

I'm fairly new to AP, i just started in October '21

I really like the large dynamic range of my first (and to date only) light.

It does NOT FULLY enlight the sensor, but it is very close and it can easily be fixed in post with flats.
I'm thinking about trying the 1:1 flattener 

/Leon, Denmark

thanks for your feedback Leon.

I have a qhy268m which is quite similar to asi2600 (same sensor). Maybe you have filters are a bit small. I read the recommended size for apsc sensors are 36mm. I don't have your scope, so I cannot confirm either

[LeonH]

thanks for your feedback Leon.

I have a qhy268m which is quite similar to asi2600 (same sensor). Maybe you have filters are a bit small. I read the recommended size for apsc sensors are 36mm. I don't have your scope, so I cannot confirm either

Hi...

i use 5x2" (inch) Optolong IR/UV-cut, L-Pro, L-Extreme, L-Enhance and Moon and Skyglow. they are mounted M48. 
i went 2inch just to make sure, that it was not my filters, that would give vignette. i have that on my 1.25" filters :-/
Smalest diameter on my imagetrain is M48 (i have mounted the EFW direct to asi2600MC (without tilt-plate).
My guess is that it is the reducer/flattener.
The reducer is ment to be mounted in the Rotator on the scope, this is what i use now.
I have ofcause tried to mount the reducer directly in the drawtube, it did not change anything other then the focus position on the drawtube. Vignette is the same.
i did expect that, since the rorator is M63 !

But i have not tried without reducer !!! yet ;-) 

But as said.. it is nothing, it can be easily fixed with flats, it is vignette, not an total block off. But i would not put on an asi6200 on the reducer.

Edited by LeonH, 18 February 2022 - 06:08 AM.

[denis0007dl]

Congrats on telescope!

 

I have 130mm version.

Its excellent!

 

TS told me that that telescope have double ED glass, of which one is FPL55, and another one China dont want reveal that others dont copy them.

Here is full tubus...

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[denis0007dl]

What I like in 130mm version is that it have part between focusser and main tubus, which can be unscrewed, and then telescope have enough backfocus for binoviewers in any setup, even if user use 2" mirror diagonal in normal way, which is excellent.

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[denis0007dl]

Same is in their 155mm APO version!

Edited by denis0007dl, 18 February 2022 - 10:20 AM.