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Hi Gary,
Some poeple say you lose some image detail and sharpness with BVs, which is always possible with more glass in the light path. Standard Denks are 1/4 wave, Denk IIs are 1/8, so unless 1/8 is just a marketing ploy, I deduce that the Std version introduces at least some distortion. Although the ST review didn't note any different, but it would be subtle and something you'd notice over time.
Re tube mods, the trouble with moving the primay in by 120mm is the mirror cell is attached to the base plate which attaches to the tube. Although...if you used longer collimation screws and locking screws you might be able to gain an inch or two before the whole assembly went wobbly.
I'll report back here with any success (or failure!).
Mark
yes, possibly the biggest reason is the loss of light. OK it is nice to use both, but if the object is dim I reckon the view is better with the single eyepiece.
Hey great idea from Mark though, this would allow you to move the mirror, and not damage the tube. Even if you made a blanking disk, and used the existing holes, then mounted the mirror cell onto this, thus bringing it forward (I think it needs to go forward as well).
Gary
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