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Originally Posted by astroboy
Excellent image Bert , just shows there are some excellent lenses out there for anyone willing to hunt them down and take a chance.
There are also some crap ones , my worst being a Pentax 800mm F4 ( yes F4 ) looked impressive but is only usfull as a boat anchor ( it was 20 KG )
Now trying a Nikon 180 F2.8 ED with Sbig ST8i and HA filter so far so good.
Zane
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The Pentax should work OK with H alpha, surely it can focus at one wavelength
bert