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This will be my second photographed lunar eclipse. I have the opportunity to use a Canon EF 500mm f4.0 on my Canon 7d, with the crop factor this will be the equivalent of 800mm. I don't think this will be a problem as I have a very solid tripod.
Should I also use a Canon 1.4x extender on this lens? This would produce an equivalent focal length of 1120mm, however I would loose an f-stop. So my question is, would this be a better setup to use the extender?
Thanks in advance for your assistance.
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