I had the Denkmeier with a powerswitch but used it with a 2" diagonal.
The result was for me very poor when using the reducer mode. I felt the image was very dim with the reducer in, and still somewhat dim even in straight though.
I noticed a pretty dramatic change when I went to the Maxbrirght with the T2 diagonal. It was very much like using a larger telescope.
With the reducer arm in, I felt like I was using a C6.
Again, my system was using a 2" diagonal, but I just don't think you are going to get anything close to full apture using a Mark V with a powerswitch unless you keep the light path very very short.
Looking forward to your report though.
Followup to post on aperture reduction in EdgeHD 8
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