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Sry Alex - I forgot - the np is 540mm. I am waiting for a wide field corrector so my mosaic frames are overlapping about 1/4 of an image at the moment - and this is cropped (about 1/4 frame top to bottom) to remove some slight vignetting as well.
You would think for a 4 inch Apo that used to retail at nearly 7k from memory until they dropped the price to 5.5k that is built primarily for astrophotography they would include a corrector for large DSLR chips (they say they are built for them)- I would have paid the extra 300 or so instead of waiting now for Big Als crew to get around to sending one. Not a complaint just an observation - really happy with the optics.
M
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