Petzval refractors and Herschel Wedge

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Merlin66
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Petzval refractors and Herschel Wedge

Post by Merlin66 » Sat Jul 09, 2016 2:19 pm

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?
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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Merlin66
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Re: Petzval refractors and Herschel Wedge

Post by Merlin66 » Mon Jul 11, 2016 8:30 am

I've just received emails from Takahashi and Williams Optics confirming that their refractors are safe to use with Herschel Wedges.......
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

Derek Klepp
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Re: Petzval refractors and Herschel Wedge

Post by Derek Klepp » Tue Jul 12, 2016 9:06 am

Thanks Ken

Solar B
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Re: Petzval refractors and Herschel Wedge

Post by Solar B » Wed Jul 13, 2016 11:12 pm

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.

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Re: Petzval refractors and Herschel Wedge

Post by christian viladrich » Fri Jul 22, 2016 8:54 am

I used my Taka FSQ106 with an Hershel diagonal for years with no problem.
The lens are fairly transparent, so they don't heat.
Christian Viladrich
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