[garymck (Gary)]

Hi,
I've decided to replace the secondary in my 12" f5 Skywatcher newt to get a bigger illuminated field. It currently only has a 70MM which barely illuminates the center of the field. I'd like to install a 3.5" (88mm).

I'd like to know peoples opinions of GSO secondaries - Andrews lists the 88mm at $99, whilst an Antares will cost around $400......

If I went for the Antares, what wavelength spec, they have anything up to 1/30th wave. Is it necessary to go to this level. My reading seems to suggest that a 15th wave would be fine.

Any other vendors to consider?

The primary in the scope is typical chinese, good, but not outstanding. I may re figure it sometime in the future, but it is fine for imaging.

cheers
Gary