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Need advise please on Lens Digiscoping with Pentax K-20

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  • Need advise please on Lens Digiscoping with Pentax K-20

    Hi there this is my first post so do not know if I have done this correctly.

    I am digiscoping using a Pentax K-20, with a Swarovski HD spotting scope 60mm 20 to 60x Zoom eyepiece I am using a lens that the f stop only goes down to 5.6. so that I am having to use an ISO around 800 which seems too grainy with slow shutter speeds for optimal pictures? I have read that I should be using a Pancake Pentax 40mm/f2.8 lens. This is an older style lens - is this still a good option - are there better options? Any advise would be most appreciated.

    Thanks Cornel
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