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TESTING out the new 2x telecomverter effectively increasing the focal length of my 500mm lens to 1000mm, plus using it on a body with a 1.6x crop sensor gives the lens an effective focal length of 1600mm.
The moon is a good starting point for testing this new range to the limit. Fortunately the sky was clear between two summer heatwaves and using the camera hand held (no tripod) and manual focus, this was about the best resolution I could get.
The above image shows about 2000 x 1100 kilometres of the moon's southern hemisphere. The large grey area at the top left is Mare Nubium. Near the twilight zone the moon's craters are very striking with the light and shadow giving them some depth, along with a raised area in their centre as a result of the asteroid impacts. Particularly impressive are the triple craters of Theophilus, Cyrillus and Catharnia to the right near the twilight zone, each with a diameter of a little over a hundred kilometres.
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