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Ahhh thanks john!
That made me go take look at extension tubes and how they work in realtion to distance of barlow to imaging chip and what effect it has on the effective f ratio of the complete system. I thought this was somewhat fixed to how far yo can push it.
but with a 2x barlow you can effectively vary the distance to achieve from x2 to x5 with different length exentsion tubes.
all said i'll go the TV x2 Barlow and a few extension tubes.
Does anyone recommend a supplier for the extension tubes?
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