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Televue Genesis SDF and 102 - diagonal advice

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#1 Blueox4

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Posted 11 July 2019 - 07:13 PM

I’ve recently acquired both a Televue Genesis SDF and a 102. Neither came with a diagonal. I have a 2” Baader Zeiss prism diagonal that I will use with the 102 I think. At f/8.8 I have confidence that the Zeiss prism will perform flawlessly like it does in my f/9 Takahashi. The SDF however at f/5.4 I feel may not benefit fully from the prism. I’ve read that faster refractors do better with a mirror diagonal. Will the SDF perform better with a Televue Everbrite diagonal or perhaps one of the Baader BBHS Sitall mirror diagonals rather than the Zeiss prism? 



#2 Mike W

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Posted 11 July 2019 - 07:23 PM

I have a Televue 102 and recommend the Televue Everbright 2" diagonal! (Or an AP 2")

 

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Edited by Mike W, 11 July 2019 - 07:24 PM.

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#3 Nippon

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Posted 11 July 2019 - 09:56 PM

I have used a Baader non Zeiss T2 prism in my f/7.7 4" doublet and it very slightly outperforms my TV Everbright so I'm sure your all set for the TV102.

Most of what I've read indicates that faster than f/7 is where the prism can have issues with CA. 


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#4 25585

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Posted 12 July 2019 - 04:07 AM

My Genesis is fine with a standard TV aluminised 2" diagonal.


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#5 Roragi

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Posted 12 July 2019 - 04:52 AM

When I had my genesis I bought this same Everbrite 2'' diagonal because I did not come in the set. It works very well, now it is with me in the traveler.

 

Roberto.


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#6 terraclarke

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Posted 12 July 2019 - 06:55 AM

I love my Baader, Takahashi, Vixen prism diagonals in my longer (~F8) refractors, but my Televue 2” Everbrite is the first choice for my F5.4 TV SDF.

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#7 Wildetelescope

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Posted 12 July 2019 - 08:59 AM

I currently use an ap maxbrite with my 102. Works well. Have a baader zeiss in order to use with another scope, and will certainly try it with the 102.

Jmd
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#8 Don W

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Posted 12 July 2019 - 10:31 AM

There are many very good 2" Enhanced diagonals out there. I have 4 different brands and really can't tell the difference in them no matter what scope they're in.


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#9 Blueox4

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Posted 12 July 2019 - 11:41 AM

Televue Everbright it is! Thank you! 


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#10 Tyson M

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Posted 12 July 2019 - 06:22 PM

Cant go wrong with the Everbrite. Alternatively an AP Maxbright could also work.




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