Please suggest me, will it be vignett?

Hello,

I have a TEC-140#255 couple with TEC-140 FF. I just bought a new ccd
camera that have a M42x0.75 thread. I want to make a new adapter to use
this ccd camera with TEC scope.

I designed a new adapter but not sure is my desing cause vignetting or
not? Can anyone please suggest me.

Please let me know my understanding is true or wrong about vignetting by
bring the light-cone (F7.0) to place at both diagonal-rim side of the ccd chip. I
saw this from FLI-cam web site.

Please see my design at
http://www.oromelo.com/pop/tec-ff-adapter.jpg

Best Regards,
Pornchai POP

Looks OK to me. You have the right idea -- you
need to allow for F7 light cone at the CCD corners.
You might check what the clear aperture of the
FF lens is, and whether it is still F/7 after
the FF; probably it is OK.