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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1674383" data-attributes="member: 19132">With my 75mm tube I can focus through the whole range from infinity down to around 8m with the GSO barlow. I shall also check tomorrow what sort of length tube you would need if you were going to use a teleconverter instead of a barlow. With a teleconverter you can get away with a much shorter tube as it's all to do with the optics being different to the barlow.Something else to note with the Kenko teleconverter is that when it is on the scope you have to put tape over the pins otherwise it will report an error to the camera because there is no lens attached to it. I don't know if gluing the AF confirm chip into the Max DSLR would cure that or not but I guess it wouldn't or maybe it would?The tube you linked to is ok. I know of a 50mm one going cheap and I'll send a pm tomorrow if I think the length is ok.Paul.</blockquote>