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Originally Posted by avandonk
The Pentax should work OK with H alpha, surely it can focus at one wavelength
bert
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Its some years since I had the lens and I was keen on film photography at the time and used a 77mm 25A drop in filter for B&W with a Pentax 6x7 and tech pan, the biggest problem was the lens wasn't sharp , particularly off axis had just about every aberration I could think of and then some.
Had to stop the lens down so far ( F8 ) it was no point using a 20KG lens when my old Genisis would out perform it.
Had a Pentax 400 F4 for the 6X7 it was very good.
Don't know how Johnny Horn got a great comet shot with his 800 F4 tried to email him before I bought the lens but no reply.