Quote:
Originally Posted by Merlin66
Gavin,
The Herschel wedge is regularly used on 150mm achromats.
It has been used in observatories with apertures up to at least 200mm.
It's a 100% safe to use with the appropriate secondary ND filters after the wedge.
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Thank you Ken
Gives me some piece of mind
.
Don't suppose you have any opinions on the Lunt wedge then?
Cheers
Gav