Best source for 20" F4 to F5 mirrors.

Hi All,

Having read the excellent book "The Dobsonian Telescope: A Practical Manual
for Building Large Aperture Telescopes" by David Kriege and Richard Berry,
the time has come to bite the bullet and locate a suitable mirror set.

Can anyone share their experience, or knowledge, of good value for money
suppliers of 20" optics in the F4 to F5 range.

I live in the UK and my choices here are limited so I though I'd ask about
what is available in the US. I expect the US prices plus shipping, import
duty and tax will still be cheaper than the UK.

Any information about good prices or tips on good suppliers (or those to
avoid) would be very useful.

Many thanks for your time.

Very best wishes and clear, dark skies.

--

/Paul B, York, UK.
http://homepages.tesco.net/paul.buglass/astrohome.htm