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you should push the camera on the shaft more until you reach focus. Is there something that hinders you from doing this ?

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yeah, the body of the DSLR the flange is crashing into the bottom of the camera now. maybe i could grind it down a bit. to be honest i'd like to re-design the shaft and the guide camera coupler like you did so that they are not so fragile, as you have.

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so - as far as i can tell, the only T to S-thread adapter that makes the lodestar compatible with the lacerta OAG is teleskop-service's 4mm thick adapter:

http://www.teleskop-express.de/shop/product_info.php/language/en/info/p2838_Adaptor-T2-female-on-C-Mount-male---only-4mm-length.html

even still, it is maybe 1-2mm away from perfect focus. while slightly out of focus guidestars are thought to be good, at high f/ratios it's kind of a compromise. i'd rather have more brighter and tightly-focused stars than faint out-of-focus stars.

still the setup is guiding better than it ever has. i've got an RMS error of 0.40 pixels with 500 samples showing. i think my guider image scale is in the neighborhood of 1.5 arcsec/px. round stars at 1100mm (which is not that much of a challenge) but still. this is on a losmandy G11 with a stock worm, and a bad one (25 arcseconds pk-pk PE, with some pretty steep slopes here and there.) between 7 minute exposures i've got 0.5px of drift in each direction, which works out to 0.44 arcseconds per axis or 0.62 arc sec total. so whatever DF there is is pretty minimal.

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