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William Optics Redcat 71 announced

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#1 Lead_Weight

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Posted 30 September 2019 - 05:42 PM

They just posted these 71mm Redcats on their facebook. Exciting to see some new sizes come out. Would love a 100mm version. There was no real information other than they're testing them.

 

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Edited by Lead_Weight, 30 September 2019 - 05:43 PM.

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#2 CrazyPanda

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Posted 30 September 2019 - 05:56 PM

Wonder how this will compare to the Meade 70mm Astrograph (which is also a Petzval design).



#3 melllince

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Posted 30 September 2019 - 06:00 PM

The MEADE70 is an alter version sky-rover 70SA

#4 OldManSky

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Posted 30 September 2019 - 06:20 PM

Interesting that the blue one has an R&P focuser, while the red one has the helical focuser of the RedCat 51.

Option to get it either way?


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#5 tkottary

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Posted 30 September 2019 - 06:56 PM

Want 71  F4 :)


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#6 Rotciv.greene

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Posted 30 September 2019 - 08:51 PM

My wife is going to kill me.

#7 Rotciv.greene

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Posted 30 September 2019 - 08:51 PM

My wife is going to kill me.
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#8 DrGomer

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Posted 01 October 2019 - 09:07 AM

Besides the unknown R&P vs helical focuser possibility, what practical performance difference and cost difference can be expected between the Cat71 (Petzval?) and the GT71 + Flattener?  


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#9 OldManSky

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Posted 01 October 2019 - 02:56 PM

Besides the unknown R&P vs helical focuser possibility, what practical performance difference and cost difference can be expected between the Cat71 (Petzval?) and the GT71 + Flattener?  

Good question.  It especially interests me, since I'm sitting here waiting for the UPS truck to deliver my brand new GT71 (got the flattener a few days ago!)...:)

With the reducer/flattener I'm at 336mm FL and f/4.73.  With a (claimed, haven't tested yet) flat field out to 44mm.

No specs on the 71 Cat...?


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#10 deepanshu29

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Posted 01 October 2019 - 03:06 PM

It seems like RedCat 71 will be f/4.9, approximately 350mm fl. There is a bigger cat in the works as well and that is RedCat 91 with f/3.9 ratio. All of this information is coming from William's comment on the original FB post. 


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#11 jag767

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Posted 01 October 2019 - 03:16 PM

Woah! 91mm f3.9, I want that for a visual travel scope!
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#12 OldManSky

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Posted 01 October 2019 - 04:14 PM

It seems like RedCat 71 will be f/4.9, approximately 350mm fl. There is a bigger cat in the works as well and that is RedCat 91 with f/3.9 ratio. All of this information is coming from William's comment on the original FB post. 

It will be fun to do a comparison with the GT71.

Which, by the way, the UPS driver just dropped off...smile.gif

Attached Thumbnails

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#13 CrazyPanda

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Posted 01 October 2019 - 04:33 PM

It seems like RedCat 71 will be f/4.9, approximately 350mm fl. There is a bigger cat in the works as well and that is RedCat 91 with f/3.9 ratio. All of this information is coming from William's comment on the original FB post. 

Wowzers. A 91mm F/4 astrograph will be a heck of an instrument if the optics hold up and the field is flat.

 

Perfect big galaxy and big nebula imager.



#14 SHFT

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Posted 02 October 2019 - 09:27 AM

It will be fun to do a comparison with the GT71.

Which, by the way, the UPS driver just dropped off...smile.gif

Very nice, will you keep the Z61?

 

WO is going strong these days.



#15 OldManSky

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Posted 02 October 2019 - 12:42 PM

Very nice, will you keep the Z61?

 

WO is going strong these days.

Sadly, no.  The household chief accountant suggested otherwise :)

It's on its way to a deserving new imager, who will no doubt put it to good use!

 

As for WO...the GT71 is typical WO quality.  Everything packed perfectly in a nice soft case (included), everything fits and tightens and works (focuser is butter-smooth, PFLAT 6AIII attaches snugly and is adjustable, rings and handle/guidescope mount are solid and nice, etc.).  I'm still getting used to the additional size and heft of the new scope (it's considerably heavier than even the fully-loaded Z61!), hopefully will have first light tonight.  

I'd love to later on get my hands on a 71-CAT to compare to...



#16 AnakChan

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Posted 02 October 2019 - 11:38 PM

This has thrown a spanner in the works. I was looking at the SpaceCat51 & this pops up. What has held me back in the SC/RC51 is the tilt issue. Whilst they have the tilt adjuster (& I’m pretty sure it’s K-Astec who’s made it or was inspired by K-Astec’s original work), I still feel that it’s remediating an inherently flawed execution.

I hope the RC71 fixes that making the tilt adjuster redundant.

The RC71 with its 350mm focal length is getting close to my FSQ85ED though.

#17 AnakChan

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Posted 26 November 2019 - 07:22 PM

Looks like we're seeing some 1st pics with the RedCat 71 on the QHY FB page, with the QHY367C & STC DuoNarrowband filter :-

https://www.facebook...039478152822124

Edit: Fixed my typo off ”Redcat 51” when I meant “Redcat 71”.

Edited by AnakChan, 27 November 2019 - 04:51 PM.


#18 timmbottoni

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Posted 27 November 2019 - 12:02 PM

As a guess, I would say that it will be about a 6-12 months before more larger RedCat sizes are actually shipping in quantity, but I for sure will want the RedCat 91. A 100mm would be even better of course, but I would guess that these get harder and harder to control the high quality needed, but keep the cost reasonable.

 

I just bought the tilt adjuster for my RedCat 51 because I think my old Canon 60D is tilting slightly. I also bought the upgraded clamp and handle, which is the "cat's pajamas" for attaching my autoguiding scope.  I tried it once and it worked amazing. 

 

I don't know how else WO can improve the design, but to offer the ability for the end user to adjust out any tilt in their cameras themselves seems ideal to me.  At this fast focal ratio, even a slight tilt will show up in corners or edges.  I'm going to try to figure out how to test it, and adjust it in the daylight, so if anyone has suggestions or links, please include them in a reply.

 

When I asked William he explained that the design is NOT very forgiving of camera tilt because the image is very flat but the depth of focus at the sensor is very small, so while it appears as though the design of the scope is well executed, what it means is that there is no way to predict how the mounted camera might end up tilted when the light finally reaches the sensor.  He also mentioned that to make sure that the focus lock ring is tight.  I tried a few tests with it loosened completely and tightened completely and I think I could see a slight difference.  It's very hard since I have an old Canon 60D, APC size, and I was looking at the live screen to try this. I should have taken some pictures, but I was a dummy and didn't.  Maybe next time.

 

Knowing that this unpredictable camera induced tilt that could be different for everyone, I'm hoping that my efforts will result in allowing me to create a "user guide" that others could benefit from.   I just have to have some time to figure it all out.

 

Happy Thanksgiving (US folks but Clear Skies to all)

 

Timm


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#19 25585

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Posted 27 November 2019 - 07:44 PM

91mm if it can be used for visual, will be worth waiting for.


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#20 astroseyer

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Posted 10 December 2019 - 04:28 PM

Anymore news on this topic? A 91mm red cat sounds amazing and worth waiting for.


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#21 Bob_Huerbsch

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Posted 27 February 2020 - 04:27 PM

Bump!! Any leaks would be appreciated ; )

#22 UKalwayscloudy

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Posted 29 March 2020 - 11:29 PM

Anybody know the Redcat 71 weight? I’ve got a CEM40 but feasibility on SkyGuider Pro intrigues me...

#23 AnakChan

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Posted 30 March 2020 - 03:08 AM

There’s been very little update since. It’s a pity, as I m curious about it too.

WO, feel free to drop a beta for me to test :).

#24 Emanuel

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Posted 07 April 2020 - 12:17 PM

Hey people! Does anyone has updated information about this?
And one more question:
If, Williams Optics releases the 71 and the 91, as someone suggested, will there be a significant improvement of the 91 over the 71 besides the light gathering?
I mean, field of view is basically the same.
If, like i say, WO ever releases a 91mm cat. :)

#25 Lead_Weight

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Posted 13 April 2020 - 04:23 PM

They seem to have found a money maker with the 51. There's a new special edition on the OPT site. So I would assume all their resources are going into making the 51s. 




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