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Parasitic heat loss up the T Adapter can be considerable as I found. The whole focussing tube and lower section of the Lunt got quite cold. I swapped to another 2" adapter which had minimal suface contact and made some plastic isolation shields to reduce losses.
The one time I had the battery door open on the 450D it would not power up. Is there an interlock involved ?
You're right about diminishing returns on this design and also the lack of controllability at the sensor. I note from earlier posts that the metal bodied cameras seem to be more compatible with this design as it conducts better but I'm not quite ready to lash out the extra $$$ just to validate this idea.
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