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Paul I would experiment with flatteners. They are not like reducers which are much more critical and fussy for distances. I find a good flattener works on several scopes perfectly well.
For example I have a 4 inch Tak FS152 flattener I got on Astromart ages ago for US$800 or less. It works perfectly on my AP140 and my TEC180.
I used to use a 2.7 inch Tak reducer with an STL11 on a 12 inch RCOS. It had some soft stars in the corners.
I bet APM has something that may work otherwise put an ad on Astromart for a 4 inch Tak flattener. It'd be a punt but its likely to work.
$3000 euro for a flattener is nuts. AP flatteners which are probably the best in the business are a lot at about US$2200.
Greg.
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