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Petzval refractors and Herschel Wedge
Posted: Sat Jul 09, 2016 2:19 pm
by Merlin66
Al Nagler has gone on record to say that all the TV designed Petzval type refractors are 100% safe to use with a Herschel Wedge.
What about the other manufacturers?
Do we have similar assurances from guys like William Optics, Takahashi, and others??
Anyone have written confirmation either way?
Re: Petzval refractors and Herschel Wedge
Posted: Mon Jul 11, 2016 8:30 am
by Merlin66
I've just received emails from Takahashi and Williams Optics confirming that their refractors are safe to use with Herschel Wedges.......
Re: Petzval refractors and Herschel Wedge
Posted: Tue Jul 12, 2016 9:06 am
by Derek Klepp
Thanks Ken
Re: Petzval refractors and Herschel Wedge
Posted: Wed Jul 13, 2016 11:12 pm
by Solar B
I normally only use a daft big achro with a wedge ... have used apos in the past but
never a petzval , imho the best white light views are obtained with a wedge prism and any refractor.
Brian
Re: Petzval refractors and Herschel Wedge
Posted: Fri Jul 22, 2016 8:54 am
by christian viladrich
I used my Taka FSQ106 with an Hershel diagonal for years with no problem.
The lens are fairly transparent, so they don't heat.