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moon shot with ef600 f4II

Started Oct 12, 2013 | User reviews thread
Iron Mike
Iron Mike Contributing Member • Posts: 540
Re: moon shot with ef600 f4II

Looking at the exif, there seems to be a few differences, for example the bare 600 was stopped down to f/8 while the 600+1.4X was wide open at f/5.6 ; but the most obvious difference, is that the moon looks different, and was not photographed at the same time. Again, looking at the exif it seems likely that the atmospheric seeing conditions on the 20th (600+1.4X shot) were not as good as the day of the first shot.

Tele-converters, like all other lenses, can be out of spec as well, or be a poor match with this particular combination. Have you tested your 1.4XIII on some of your other lenses to check its performance? You might also need a separate AFMA input for the 600+TC combination.

It seems that there is likely something else at play, because all the other image samples I have seen of this combination show far less image degradation than what we see here.

Mike

P.S. I don't personally own a 600mm, so take my opinions for what they are worth...(i.e. not much)

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