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WO Fluorostar 91 - new scope

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#76 carathir

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Posted 02 March 2021 - 12:19 PM

Seems like there is a pretty large shipping fee to order from WO website to the US. 



#77 nirvanix

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Posted 02 March 2021 - 05:33 PM

Beautiful scopes. If you think about it, over the years WO has really upscaled the fit and finish of our equipment.


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#78 Tyson M

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Posted 02 March 2021 - 05:47 PM

Beautiful scopes. If you think about it, over the years WO has really upscaled the fit and finish of our equipment.

I agree, new WO stuff seems to be improved designs on the older scopes.  Love the handles, the intergrated batinov mask (I dont image though).

 

This scope in Space Grey would be so cool.


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#79 AZ49

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Posted 02 March 2021 - 08:11 PM

Just got mine in and it’s going back. Focuser issues and some CA when looking at a tree branch in daylight. Otherwise a beautiful looking scope. 



#80 Nova44

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Posted 03 March 2021 - 03:06 PM

Just got mine in and it’s going back. Focuser issues and some CA when looking at a tree branch in daylight. Otherwise a beautiful looking scope. 

I preordered one but new/unreviewed products slightly worry me too. Being WO quality I'd think they'd have their QA worked out before the first shipment.  CA means the optics weren't matched well, right? Which dealer did you purchase it from? None of the US dealers have them in stock yet.


Edited by Nova44, 03 March 2021 - 04:38 PM.


#81 AZ49

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Posted 03 March 2021 - 06:25 PM

I preordered one but new/unreviewed products slightly worry me too. Being WO quality I'd think they'd have their QA worked out before the first shipment.  CA means the optics weren't matched well, right? Which dealer did you purchase it from? None of the US dealers have them in stock yet.

I got it in Canada. At night it didn’t show CA much. I pointed it at a street light and just a hint of CA was visible at the 90% of FOV. But I’m the daytime it was not good. For a fluorite triplet that’s a red flag. The other issue is the focuser. The micro focuser didn’t work when the scope was pointed at 70 degrees. 



#82 Nova44

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Posted 03 March 2021 - 10:21 PM

I got it in Canada. At night it didn’t show CA much. I pointed it at a street light and just a hint of CA was visible at the 90% of FOV. But I’m the daytime it was not good. For a fluorite triplet that’s a red flag. The other issue is the focuser. The micro focuser didn’t work when the scope was pointed at 70 degrees. 

During the daytime did you take a photo of a tree branch, or use an eyepiece? How do you do this test to check for CA?



#83 AZ49

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Posted 03 March 2021 - 11:41 PM

I used an eyepiece. TV Nagler 9mm and APM XWA 9mm. Both showed it



#84 Cometeer

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Posted 04 March 2021 - 12:19 AM

I used an eyepiece. TV Nagler 9mm and APM XWA 9mm. Both showed it

Are you sure it’s not lateral color caused by the eyepiece?



#85 AZ49

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Posted 04 March 2021 - 07:17 AM

Are you sure it’s not lateral color caused by the eyepiece?

I thought that as well. But then I looked through my WO Z61II, and it was flawless with the same eyepieces. 



#86 nirvanix

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Posted 04 March 2021 - 04:29 PM

Maybe improper spacing of the objective elements? New scope buyers taking one for the team...


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#87 duck2k

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Posted 04 March 2021 - 07:47 PM

I do not have any frac beyond 80mm. The 91 looks attractive in the WO way, and I am sure it be a great performer too.

I am strictly visual, and I have been really happy with my WO Z81. Viewing at 21 to 86x is my comfort zone. Plus I love the blue color.:)

#88 TareqPhoto

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Posted 04 March 2021 - 07:54 PM

I do not have any frac beyond 80mm. The 91 looks attractive in the WO way, and I am sure it be a great performer too.

I am strictly visual, and I have been really happy with my WO Z81. Viewing at 21 to 86x is my comfort zone. Plus I love the blue color.smile.gif

I passed this stage with 6" and 7" and 8" scopes, and i ordered 90mm [not WO] already so i went beyond 80mm [my ST80] already, and i can say visual is nice with all of them while i am still waiting my 90mm scope.


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#89 AZ49

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Posted 04 March 2021 - 10:39 PM

I do not have any frac beyond 80mm. The 91 looks attractive in the WO way, and I am sure it be a great performer too.

I am strictly visual, and I have been really happy with my WO Z81. Viewing at 21 to 86x is my comfort zone. Plus I love the blue color.smile.gif

Im actually happy with my WO 61 II. I went out this evening. Seeing below average. But transparency was Excellent. This little thing resolved the Orion Nebula with no problem. Really impressed. 
 

Just bought the Stellarvue SVX102T. Excited to see how that one performs. 


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#90 duck2k

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Posted 05 March 2021 - 12:01 AM

Im actually happy with my WO 61 II. I went out this evening. Seeing below average. But transparency was Excellent. This little thing resolved the Orion Nebula with no problem. Really impressed. 

I too have the WO Z61II. That scope is a little monster! The views through that are amazing! Great for open clusters!:)


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#91 AZ49

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Posted 05 March 2021 - 11:20 AM

I want to take it to a dark site and see what it can do. Obviously compared to a 4” it wouldn’t compete, but from what I’ve seen, it is certainly impressive. The moon was so sharp. 



#92 ProfLemoi

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Posted 30 March 2021 - 03:30 PM

Just ordered my William Optics FLT 91 Fluoro Star with the .08 Focal reducer.  I am hoping this is going to be an upgrade from the Orion EON 85 Triplet that I have, or as good as it :)

Excited and worried all at the same time.  Unproven scope.. but WO quality is very good, I love my Redcat 51.

 

Gonna pair this baby with the new ASI2600MM Pro and see how we do :)



#93 TareqPhoto

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Posted 30 March 2021 - 04:12 PM

Just ordered my William Optics FLT 91 Fluoro Star with the .08 Focal reducer.  I am hoping this is going to be an upgrade from the Orion EON 85 Triplet that I have, or as good as it smile.gif

Excited and worried all at the same time.  Unproven scope.. but WO quality is very good, I love my Redcat 51.

 

Gonna pair this baby with the new ASI2600MM Pro and see how we do smile.gif

I was thinking about this scope as well to be my second next scope, but i changed my plan and mind, the first one i ordered is also a new model and first time ever for me to get an APO refr triplet scope, so i am also worried, BUT, a big but here, that i was imaging for years several times with an achromat scope, so this scope has to do the job, and because it is a new model and the manufacturer delayed the shipping to make it right, so we will see once it arrives [shipped already], fingers crossing.



#94 benklerk

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Posted 31 March 2021 - 12:51 AM

I'm at the stage of going to get my first triplet APO. It;s either the WO FLT 91 or Esprit 100. I'm waiting for reviews to see how FLT 91 performs. Upgrading from the Skywatcher 72ED.



#95 ProfLemoi

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Posted 31 March 2021 - 09:50 AM

I'm at the stage of going to get my first triplet APO. It;s either the WO FLT 91 or Esprit 100. I'm waiting for reviews to see how FLT 91 performs. Upgrading from the Skywatcher 72ED.

I was going to go the Esprit 100 route too... tried and true... BUT, ya can't get them.  Long Back Order... sometime in September when I reached out to them recently. WO has high quality scopes so I am hopeful that this will pan out... mine should be shipping out in the next few days.



#96 ProfLemoi

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Posted 31 March 2021 - 02:07 PM

I noticed that in the spec sheet that William Optics list the following Flatteners as compatible with the FLT91:

 

FLAT 6A III x0.8  FLAT 68 III x1.0

 

I was able to score an In Stock FLAT 6AIII but can anyone tell me the advantages of the 68III over the 6AIII?


Edited by ProfLemoi, 31 March 2021 - 02:11 PM.


#97 DennisOrion

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Posted 31 March 2021 - 03:47 PM

The 68III is 1.0 as you note, so it doesn't change the focal length/ratio. Advantage or disadvantage? Depends on what you want to shoot. 

 

Regarding the 6AIII you picked up, was it one of the new 'special editions'? The 6AIII has M63 threads and the 68III has M92 threads, so obviously the focuser on the FLT91 has M92 threads. The point is the 6AIII requires an adaptor, which comes with the 'special edition'. WO will make the adaptor available for individuals that already have a 6AIII.

 

Dennis



#98 ProfLemoi

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Posted 31 March 2021 - 05:09 PM

Hi Dennis,

 

Yes, what I have coming is the "Special Edition" of the 6AIII.

 

Kevin



#99 ProfLemoi

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Posted 31 March 2021 - 05:11 PM

Thew question is why the HUGE price difference between both... and can you elaborate on when using one vs the other would create an advantage?

I am trying to decide if I need to order the other unit.

 

Thanks! :)

Kevin



#100 DennisOrion

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Posted 01 April 2021 - 08:33 AM

Kevin,

 

You are all set for the 6AIII then.

 

As to the price difference, the 68II has the M92 threads, so it is much bigger than the 6AIII (M63 threads). Bigger glass (?) combined with flattening the image without reducing the focal length makes things more complicated, but then again I'm not an expert on optics so I could be wrong.

 

The FLT91 has a focal length of 540mm and an f ratio of 5.9, with the 68III on it this remains the same. With the 6AIII it's now 432mm/f4.7. If you have a target that fits inside the frame of 432mm focal length (not counting the camera sensor size) you could image faster with the 6AIII and fill more of the sensor with the details you want to capture. If you used the 68III in this instance you would have wasted space around your target and it would take longer. Now if your target will not fit inside of 432mm, but it will fit inside of 540mm, then you would obviously want the 68III. Having two flatteners/focal reducers is like having two telescopes with different focal lengths.

 

I hope this helps.

 

Dennis


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