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WO Fluorostar 91 - new scope

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#26 AP-Photo

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Posted 30 October 2020 - 10:06 AM

The longer I wait, the more "on the fence" I find myself.  Looking at the FLT91, assuming it comes in at $2k, adding a flattener and flattener/reducer brings it up to $3300 (I'm assuming it will need the larger flatteners).  The Stellarvue SVX102T-R has also caught my eye, with bigger aperture and less expensive flattener/reducer hardware, and higher quoted Strehl stats.  In comparison, the SV scope and 2 flatteners would only be ~$500 more than the WO scope.  Decisions, decisions...

 

How high a Strehl is "good enough" when chasing very high astro photo quality?  .97 and .99 seem like they'd both get the job done, but I don't have enough experience to know just how big that difference might appear.



#27 TareqPhoto

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Posted 30 October 2020 - 10:32 AM

The longer I wait, the more "on the fence" I find myself.  Looking at the FLT91, assuming it comes in at $2k, adding a flattener and flattener/reducer brings it up to $3300 (I'm assuming it will need the larger flatteners).  The Stellarvue SVX102T-R has also caught my eye, with bigger aperture and less expensive flattener/reducer hardware, and higher quoted Strehl stats.  In comparison, the SV scope and 2 flatteners would only be ~$500 more than the WO scope.  Decisions, decisions...

 

How high a Strehl is "good enough" when chasing very high astro photo quality?  .97 and .99 seem like they'd both get the job done, but I don't have enough experience to know just how big that difference might appear.

I am with you, i will see what you will end up as thinking and choices.



#28 zsb04

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Posted 30 October 2020 - 10:41 AM

I used to have a flt98 that was an awesome scope, they should bring that one back!

#29 TareqPhoto

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Posted 30 October 2020 - 11:05 AM

I used to have a flt98 that was an awesome scope, they should bring that one back!

They won't, now with FLT91 i am sure 98 is forever dead, they might bring something larger than 100 or smaller than 91, no point to discontinue 98 and then reproduce it again, and i don't see any V2 of it any soon.



#30 Tyson M

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Posted 30 October 2020 - 11:06 AM

I think 90mm feels a good niche between the 80 and 100mm scopes.  Sorry for stating the obvious lol.

 

It felt like the punch of a 100mm, but the size of the 80mm. 

 

This looks like a really nice scope, and their FLT line has always been their highest quality offerings. 



#31 awong101

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Posted 30 October 2020 - 05:26 PM

The longer I wait, the more "on the fence" I find myself.  Looking at the FLT91, assuming it comes in at $2k, adding a flattener and flattener/reducer brings it up to $3300 (I'm assuming it will need the larger flatteners).  The Stellarvue SVX102T-R has also caught my eye, with bigger aperture and less expensive flattener/reducer hardware, and higher quoted Strehl stats.  In comparison, the SV scope and 2 flatteners would only be ~$500 more than the WO scope.  Decisions, decisions...

 

How high a Strehl is "good enough" when chasing very high astro photo quality?  .97 and .99 seem like they'd both get the job done, but I don't have enough experience to know just how big that difference might appear.

William himself has posted on facebook that the Fluorostar 91 will come in at below $2,000.


Edited by awong101, 30 October 2020 - 05:27 PM.


#32 TareqPhoto

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Posted 30 October 2020 - 06:38 PM

William himself has posted on facebook that the Fluorostar 91 will come in at below $2,000.

And one store quoted it with very slightly above $2000, i will wait more stores to make it in stock with final price.



#33 AZ49

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Posted 03 November 2020 - 03:29 PM

I used to have a flt98 that was an awesome scope, they should bring that one back!

What is a heavy scope?



#34 zsb04

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Posted 03 November 2020 - 04:20 PM

If I recall, maybe 10-12 pounds loaded up, I could be off though. At f6.3 it was pretty compact and an excellent performer

#35 AZ49

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Posted 03 November 2020 - 04:54 PM

If I recall, maybe 10-12 pounds loaded up, I could be off though. At f6.3 it was pretty compact and an excellent performer

Thanks for letting me know. I was debating in picking one up used or waiting fir the FLT91



#36 awong101

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Posted 03 November 2020 - 06:20 PM

Thanks for letting me know. I was debating in picking one up used or waiting fir the FLT91

If you've been following the classifieds, thanks to all the douchebags who get away with selling William Optics with like-new pricing, and thanks to all of the idiots who pay such ridiculous amounts and thus driving up the used market prices, I am more than positive you can get the Fluorostar 91, and re-sell it later and not take much of a hit.

 

Ooops, was that too loud? Sorry, my narrowband BS filter must not have been working properly.


Edited by awong101, 03 November 2020 - 06:21 PM.

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#37 TareqPhoto

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Posted 03 November 2020 - 07:45 PM

If you've been following the classifieds, thanks to all the douchebags who get away with selling William Optics with like-new pricing, and thanks to all of the idiots who pay such ridiculous amounts and thus driving up the used market prices, I am more than positive you can get the Fluorostar 91, and re-sell it later and not take much of a hit.

 

Ooops, was that too loud? Sorry, my narrowband BS filter must not have been working properly.

Tell us, i mean me, the story bout it.



#38 AP-Photo

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Posted 09 November 2020 - 12:37 PM

The latest post from WO on Facebook has the FLT91 at 650mm. Interesting that they went from f/5.9 (previously posted) to f/7.14. 2 months after trailer and not much real detail yet. Would like to understand more before deciding between it and the SVX102T from Stellarvue, but I'm getting impatient!

#39 Tyson M

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Posted 09 November 2020 - 01:52 PM

The latest post from WO on Facebook has the FLT91 at 650mm. Interesting that they went from f/5.9 (previously posted) to f/7.14. 2 months after trailer and not much real detail yet. Would like to understand more before deciding between it and the SVX102T from Stellarvue, but I'm getting impatient!

Faster it is, the harder/more expensive it is to make. To meet their specs it likely needed to be changed.



#40 TareqPhoto

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Posted 09 November 2020 - 02:54 PM

Oh, i am not interested then, in this case i think i have to look at 100mm [4"] aperture scopes.



#41 TareqPhoto

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Posted 10 November 2020 - 10:12 AM

Something weird, in this video it is written WO 91 APO F/5.9 and focal length is 600mm, how they calculated that? 91mm x 5.9 = 536.9mm, so what is going on? I don't like when things aren't clear here and there.

 

https://www.youtube....0uw6U7ThO6xH0Vs



#42 awong101

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Posted 10 November 2020 - 12:20 PM

Something weird, in this video it is written WO 91 APO F/5.9 and focal length is 600mm, how they calculated that? 91mm x 5.9 = 536.9mm, so what is going on? I don't like when things aren't clear here and there.

 

https://www.youtube....0uw6U7ThO6xH0Vs

That's what I thought too, I saw it and the math simply didn't make sense.


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#43 Mr. Mike

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Posted 10 November 2020 - 05:56 PM

There is definitely a market for 90mm class tubes. Astrophysics, CFF, Astrotech, TMB, Sharpstar, Borg all think so. They are that bit larger than 80mm tubes, while still preserving that bit more portability over 100mm class tubes.

Absolutely agree!  80's are fun and 102's give you that extra light grasp but the 90mm series has been mostly missing for a while now.  They are the "Goldilocks" of small refractors.  Little more tangible light grasp than the 80mm but nowhere near the mount requirements of the 102mm.  Heck, if there was a good 90mm option at the time I may have bought one instead of my 102mm triplet. 

 

There are a few out there but the more the merrier.  I used to own a 90m WO Megrez doublet and really liked it.


Edited by Mr. Mike, 10 November 2020 - 05:56 PM.


#44 TareqPhoto

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Posted 10 November 2020 - 06:41 PM

Just got a reply from William Optics on their page on Facebook:

 

"Tareq Abdulla yes,650 mm is using Barlow"

 

The question is, what kind of Barlow is that to make it 650mm? And what is the native focal length anyway?



#45 Tyson M

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Posted 10 November 2020 - 09:07 PM

Telescope Express has a new scope incoming, a 90mm f6 fpl55 triplet with test certificate available. 

 

I wonder if this was the base idea for the WO scope. Perhaps this scopes focal length will change amd get updated on the website



#46 TareqPhoto

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Posted 11 November 2020 - 12:53 AM

Telescope Express has a new scope incoming, a 90mm f6 fpl55 triplet with test certificate available. 

 

I wonder if this was the base idea for the WO scope. Perhaps this scopes focal length will change amd get updated on the website

I ordered that 90mm F/6 scope and just waiting it to be shipped next week, and that is why i am interested in WO 91 as a second 90 aperture scope for my dual imaging system, most likely if it is not as we expected then maybe i will buy this TS 90mm again.


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#47 tristan89

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Posted 11 November 2020 - 01:12 PM

Telescope Express has a new scope incoming, a 90mm f6 fpl55 triplet with test certificate available.

I wonder if this was the base idea for the WO scope. Perhaps this scopes focal length will change amd get updated on the website


Actually, they are the same scopes from the same manufacturer.
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#48 Tyson M

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Posted 11 November 2020 - 01:50 PM

Actually, they are the same scopes from the same manufacturer.


Yea that was essentially what I was saying.

#49 AnakChan

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Posted 15 November 2020 - 04:40 AM

From WO's Facebook: https://www.facebook...164382273115383

Is this their Fluorostar 91?

 

125189143_10164382266315383_6372839749469524840_n.jpg 125460561_10164382266380383_890320325331848333_n.jpg


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#50 TareqPhoto

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Posted 15 November 2020 - 05:33 AM

Sounds it is!




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