thanks for your suggest
but I don't under stack why do you wish to connect 224 directly to EFW?
I think the sensor of 224 is so small and don't care the distance between EFW and itself
thanks for your reply.
I wished to try old reflex lenses, for example an old Maksutov telephoto.
Some of these Maks can be cheaply modified, even with the addition of a focal reducer which hopefully doesn't degrade too much the quality at the edge of small sensors.
While I was doing some attempts, I found the follow:
the shorter the total length of the rings, adaptors and filter wheel used, the shorter would be the equivalent focal length.
That said, I understand that the sensor would be less protected from stray light, because of the open sector of the filter wheel in its vicinity. The nosepiece is a shield itself.
But this problem could be easily bypassed.
P.S. To All: please, this is not an invitation to destroy your nice Maksutovs. I did not find any sample imagery through similar setups I described. So I would like to try myself, and because I have no access to any machinery resource I shared my idea.