I was rummaging around through my 2004 RTMC pictures and found this one that shows the reflection of the steering flat onto the primary mirror of my 10" Reverse Newtonian (aka Porter Turret). The image is of the Moon's reflection off the famous RTMC dust that had settled on the primary. The dark spot in the center is the non-reflection of the hole in the steering flat where the image passes through to the eyepiece (see optical layout). The RTMC dust shows the small obstruction fairly easily, it is around 12%, which gives 1.2" maximum linear object size. 2" wide field ep's don't add too much here, but high power planetary images are very nice 
David Simons
David Simons
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David Simons
