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Don't want to sidetrack this topic, but thanks for your knowledgable input Satchmo, I was obviously working off the theoretical TFOV for the system and completely forgetting what I was actually seeing at the eyepiece(s). Maybe something to do with not actually remembering because it's been so long since we've had any clear sky down this way. The lightpath through the BV is certainly vignetting the light cone from the objective lens, from memory the field stops in the eyepiece holders is about 18mm. Can't wait to test in the field to measure what I'm actually seeing, maybe only 50' arc !
Jeff
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