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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1241551" data-attributes="member: 19132">Yeah, that sounds about right.Some decent weather today so plenty of time to play. All the photos below were taken of a target at approx 35m range an I think there's a fly on the light in all the photos to use as a comparison. Using the 600mm photo as a guide, the last photo with the most magnification is around 400% bigger or about 2400mm before 1.6X crop factor. All the photos apart from the first one were taken with just the 2" GSO 2X ED barlow.All photos are uncropped, just resized to 1024.1st photo is prime focus.2nd photo is with the barlow mounted close to the camera via the t-mount.3rd photo the magnification was increased by adding a 60mm extension between the camera and the barlow.4th photo had a 180mm extension tube between the camera and the barlow. I haven't posted one with 120mm extension tube but it is quite similar to the 180mm.Initially the first 60-120mm extension tubes provide quite a good jump and then it tapers off quite quickly. You don't get such big jumps in magnification once you start adding even more extension. 60-120mm is about the ideal. The 180mm one is similar to what 120mm would show.In all the photos however the resolution stands up very well. I couldn't get as a good a quality by using the barlow in combination with teleconverters, too much glass. I should think in most situations the barlow either alone or in combination with extension tubes would cover all the ranges where a good quality photo can be achieved with digiscoping. Also because the resolution with the barlow is so good the photos can stand a lot of cropping, even at 100% they are usable.Paul.</blockquote>

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