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WO Fluorostar 91 - new scope

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174 replies to this topic

#101 lakerunr

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Posted 01 April 2021 - 09:59 AM

I have the Flat6AIII on my GT71, M63 focuser thread, and the 68III on my FLT 132, M92 focuser thread. The 68III is at least twice as big and twice as heavy as the 6AIII. Can't imagine the 6AIII on the FLT132 with a M92-M63 adapter. I would think vignetting would be terrible. I also have the Flat8 for the FLT132 which is gives 0.72 reduction. It is even bigger and heavier than the 68III. Flat6AIII is less than half the cost of the 68III, so I doubt the 6AIII has as good optics. Flat8 and 68III are very solid, threaded adapter tight and accurate. Flat6AIII is sloppy in the adjustment threads. I had to do a lot of playing around with the adjustment position to get flat stars in the GT71. Flat8 was spot on with the recommended setting, same with 68III. Both of these scopes use the stock focuser.

 

I have had three WO scopes, and they were all very good for the price. But I think I would wait for the next release to let them get the bugs out, similar to Red Cat. Mine are versions III or IV, except for the Z73 I had. It was initial release and was OK, but was a doublet, so hard to compare to the triplets.



#102 ProfLemoi

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Posted 06 April 2021 - 12:19 PM

My New FLT91 arrived today!  Looks awesome.  The one thing I did notice was the focus seemed to have a "Rubbing" sound, anyone else seen this?  Perhaps because it is new this will go away but I have to say the EON 85 that I have is smoooooth as silk on the focusing, no rubbing sounds.
 

Kevin


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#103 e34stx

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Posted 06 April 2021 - 04:00 PM

My New FLT91 arrived today!  Looks awesome.  The one thing I did notice was the focus seemed to have a "Rubbing" sound, anyone else seen this?  Perhaps because it is new this will go away but I have to say the EON 85 that I have is smoooooth as silk on the focusing, no rubbing sounds.
 

Kevin

Mine  has this too I think it’s normal. I’m still trying to work out how to set the flattened up...not that my camera has turned up yet. The drawings I have aren’t really clear with and where to take measurements from. A manual would be good

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Edited by e34stx, 06 April 2021 - 04:03 PM.


#104 ProfLemoi

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Posted 07 April 2021 - 09:38 AM

Mine  has this too I think it’s normal. I’m still trying to work out how to set the flattened up...not that my camera has turned up yet. The drawings I have aren’t really clear with and where to take measurements from. A manual would be good

Yup... same issue with me.  I have the 6AIII flattener and I need to figure out how to attach it.  
I have to say I am a bit bummed that my Orion 85 has a smoother focus than the NEW FLT91.  

 

Kevin



#105 e34stx

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Posted 07 April 2021 - 10:17 AM

I only notice it on the coarse knob the fine is smooth.


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#106 e34stx

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Posted 09 April 2021 - 10:41 AM

Ok so I emailed WO about the 6aiii the gap should be 5.4mm, still waiting on the 68iiii but looking at the drawing I posted it should be 10mm. When I get my camera and the skies are clear I will see how the stars look.



#107 benklerk

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Posted 09 April 2021 - 06:00 PM

I took the plunge and ordered the new FLT 91 with the 0.8x flat reducer. Should be in my hands at the end of the month or early next month.



#108 DennisOrion

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Posted 09 April 2021 - 09:03 PM

Mine just came in today and I have to say I'm a little disappointed in the focuser. I has some rubbing issues like others have mentioned. The coarse focus is bad. The fine focus is smooth in most places, but I did notice a spot where it just spins and doesn't move the focuser. 

 

IMG_0208.jpg

 

These two are from the lower 1/3 of the focuser tube:

 

IMG_0207.jpg

 

IMG_0206.jpg

 

This one is at the top:

 

IMG_0205.jpg

 

Dennis

 

 

 

 



#109 e34stx

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Posted 10 April 2021 - 06:55 AM

Mine just came in today and I have to say I'm a little disappointed in the focuser. I has some rubbing issues like others have mentioned. The coarse focus is bad. The fine focus is smooth in most places, but I did notice a spot where it just spins and doesn't move the focuser. 

 

attachicon.gifIMG_0208.jpg

 

These two are from the lower 1/3 of the focuser tube:

 

attachicon.gifIMG_0207.jpg

 

attachicon.gifIMG_0206.jpg

 

This one is at the top:

 

attachicon.gifIMG_0205.jpg

 

Dennis

Hi, mines not that bad certainly does not have any marks on the tube. The screws on the top may require slight adjustment to loosen off the tension.



#110 DennisOrion

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Posted 10 April 2021 - 12:28 PM

I will give that a try. BTW, how far does your dew shield extend? Mine moves out about 28mm. The specs show a difference of 69mm between the retracted and extend lengths.

 

Dennis



#111 e34stx

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Posted 10 April 2021 - 01:02 PM

Not sure tbh about the shield..my setup has the scope clamps preventing full retraction. Let us know how you get on with the focuser adjustment.

Regards


Edited by e34stx, 10 April 2021 - 01:03 PM.


#112 DennisOrion

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Posted 10 April 2021 - 01:36 PM

Here's the dew shield:

 

IMG_0211.jpg

 

IMG_0212.jpg

 

IMG_0213.jpg

 

Is yours's the same? I'm surprised because it doesn't seam like the dew shield extends very far in front of the front element.

 

Dennis

 

 

 

 



#113 DennisOrion

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Posted 10 April 2021 - 01:45 PM

I did take it out last night for some visual work, it's nice and sharp. With the 24mm eyepiece I achieved focus at about ~1-2mm out. You can see the small gap between the rotator and the focuser. With any other eyepiece (11mm and smaller) I was not able to achieve focus. It needed to move in, but there's no room. I assume the camera rotator needs to go. I loosened the three small set screws (one can be seen at the 180 mark) but I couldn't separate the knurled (adaptor?) to the left of the degree marks from the rotator. It looks like the extension tube with the red rotolock with match up with the adaptor to the left of the rotator. Is this what needs to be done for visual use?

 

IMG_0209.jpg

 

IMG_0210.jpg

 

Dennis

 

 

 



#114 e34stx

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Posted 10 April 2021 - 03:02 PM

Here's the dew shield:

 

attachicon.gifIMG_0211.jpg

 

attachicon.gifIMG_0212.jpg

 

attachicon.gifIMG_0213.jpg

 

Is yours's the same? I'm surprised because it doesn't seam like the dew shield extends very far in front of the front element.

 

Dennis

Their quoted distance is with the rings off.



#115 e34stx

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Posted 10 April 2021 - 03:06 PM

I did take it out last night for some visual work, it's nice and sharp. With the 24mm eyepiece I achieved focus at about ~1-2mm out. You can see the small gap between the rotator and the focuser. With any other eyepiece (11mm and smaller) I was not able to achieve focus. It needed to move in, but there's no room. I assume the camera rotator needs to go. I loosened the three small set screws (one can be seen at the 180 mark) but I couldn't separate the knurled (adaptor?) to the left of the degree marks from the rotator. It looks like the extension tube with the red rotolock with match up with the adaptor to the left of the rotator. Is this what needs to be done for visual use?

 

attachicon.gifIMG_0209.jpg

 

attachicon.gifIMG_0210.jpg

 

Dennis

These are the distance used for visual I think

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#116 e34stx

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Posted 10 April 2021 - 03:09 PM

William optics need to pull their finger out with a manual showing all of this..tbh it’s pretty poor from a manufacturer to not have such info available. I have requested a manual for weeks now with no reply!



#117 e34stx

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Posted 10 April 2021 - 03:20 PM

Im not sure if you can remove the section after the rotator so the dielectric fits into the rotator?

Attached Thumbnails

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Edited by e34stx, 10 April 2021 - 03:28 PM.


#118 DennisOrion

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Posted 10 April 2021 - 04:30 PM

Yes that did it. That removes about 39mm of space. I have no idea why I didn't look closer at that piece. Thanks.



#119 MagicStars

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Posted 10 April 2021 - 07:06 PM

Mine just came in today and I have to say I'm a little disappointed in the focuser. I has some rubbing issues like others have mentioned. The coarse focus is bad. The fine focus is smooth in most places, but I did notice a spot where it just spins and doesn't move the focuser. 

 

attachicon.gifIMG_0208.jpg

 

These two are from the lower 1/3 of the focuser tube:

 

attachicon.gifIMG_0207.jpg

 

attachicon.gifIMG_0206.jpg

 

This one is at the top:

 

attachicon.gifIMG_0205.jpg

 

Dennis

I'm having the same focuser issues that you are describing.  I have similar rubbing marks.  The coarse knob seems to bind for 10-12 units of movement than it freely moves 10-12 units.  This repeats along the entire focus movement.  When the OTA is pointed upwards when you move across the binding area the fine adjustment just spins and doesn't move the focus.  You have to adjust with the coarse knob.  Once you move past the binding then the fine focus knob works.  Per WO suggestions I've been trying to adjust the two top screws, but so far I've not found a setting that makes the focuser move smoothly.  I'm using a 2"diagonal and 2" EP.

 

This is my first refractor OTA with my other main OTA being a Celestron 9.25 EdgeHD SCT.  Don't know much about R&P focusers, but I have to believe my WO FLT 91 APO should not be doing this.

 

My dew shield moves 28mm forward also.


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#120 e34stx

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Posted 11 April 2021 - 04:56 AM

Not sure but I noticed but the 2 main focus adjustment arm fixing screws were loose. I noticed the arm flexed when the tube was going past the home position. I’m not sure if this is normal, however I did tighten them up. It doesn’t seem to effected anything although I haven’t used the scope yet due to the efin weather.



#121 ASTERON

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Posted 11 April 2021 - 06:18 AM

Oh man, 2.515 €, it must be the most expensive thermometer of the history

Well, ... er.... the thermometer is made from Titanium™  after all.....

 

the version with the Platinum™  thermometer costs Euro 5,500.....

 

It reminds me of the $500 screwdrivers northrup -Grumman used to sell to NASA...bow.gif



#122 skysurvey

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Posted 11 April 2021 - 12:43 PM

Well, ... er.... the thermometer is made from Titanium™  after all.....

 

the version with the Platinum™  thermometer costs Euro 5,500.....

 

It reminds me of the $500 screwdrivers northrup -Grumman used to sell to NASA...bow.gif

Ummm, in the end here in Europe I can find it at England (1.975£ = 2.275€ but you have to add the taxes, you know, the Brexit...) or I can find it in Astroshop where it is listed at 2.399€, so It is not so expensive, if only they had added an hygrometer on the other side...  gve.gif

 

Regards

Jose


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#123 skysurvey

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Posted 11 April 2021 - 12:46 PM

I will give that a try. BTW, how far does your dew shield extend? Mine moves out about 28mm. The specs show a difference of 69mm between the retracted and extend lengths.

 

Dennis

28mm for a movable dew shield is a joke, I would prefer a fixed dew shield in this case, sorry to hear that.

Regards

Jose



#124 e34stx

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Posted 11 April 2021 - 02:42 PM

28mm for a movable dew shield is a joke, I would prefer a fixed dew shield in this case, sorry to hear that.

Regards

Jose

Works fine for me. Can’t see any similar setups being any different with tube clamps.



#125 e34stx

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Posted 13 April 2021 - 04:46 AM

Yes that did it. That removes about 39mm of space. I have no idea why I didn't look closer at that piece. Thanks.

William optics have confirm that the extension tube may be removed to achieve focus with an eyepiece. Just waiting on my camera then I will post up some rgb and sho images.


Edited by e34stx, 13 April 2021 - 04:46 AM.

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