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Curious
Andrew mentioned
"The old 6.3s have about 260mm true FL and sit about 110mm from the chip.
The new ones have about 130mm tru FL and sit about 45mm from the chip. ( ie unusable visually )"
But I can't get a "true focal length" measurement of more than 210-215 to the middle of the rear lens. This does indicate the spacing should be 110mm which seems to be right. I bought this from Agenaastro on ebay a month ago so they must have old stock?
Merlin do you have a spreadsheet showing the effect on coma?
Cheers
Stephen
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