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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1244882" data-attributes="member: 19132">I've looked into using a Powermate many times but have only ever found one bird photo taken with one on the web. The photo was very poor and because of the cost of the Powermate I have never taken the gamble and got on myself. Astro photographers use them the most, usually couple to a webcam that has had it's lens removed. Webcams have tiny ccd's which provide a huge crop factor. GSO make a apochromatic 5X barlow that I may try that one day. Televue Powermates aren't considered barlows because the light path that exits the barlow is different to a barlow plus they are a 4 element design.Rick - agreed it's not just the FPL-51 or the FPL-53 ED element that should be taken into consideration with regards to CA. The mating element will have a big effect on the resulting image but very rarely do telescope makers say what the mating element is made of so that we can look them up on charts to see what the performance will be. Paul.</blockquote>