Originally Posted by bigjas
Does this mean that non expert user installs are unlikely to ever achieve the best results. 1mm is pretty daunting as I'm only doing this by eye. Any tips or tools that may assist? It looks like the light is passing through the middle of the exit lens but I'm by no means certain
I got my first cylindrical lens in 2009 and I'll admit, it was not until some time in 2010 I actually worked out how to get the best out of it. So no I don't expect anyone here to have it sorted right away.
For a time my lens was mounted to a manual slide and the difference between where the slide touches the rubber stops and locks was the difference between perfect focus and not quite there.
The interesting thing is, there are probably next to no movies that actually have much detail to the level of single pixel lines, so even when you don't have 100% alignment, the image will still look good.
As Asnsi said, the projector's lens itself may prevent you from obtaining corner to corner focus simply because of its own design faults or limitations, so don't lose sleep over it. I would suggest removing the anamorphic lens from the light path and focusing the image as best you can first, then add the A-Lens and do the astigmatism adjustment.
One of the best tips for checking alignment was originally posted by Aussie Bob which involves sliding a piece of paper between the Projector's lens and the anamorphic adapter. This way you can see the rectangle of light and its position on the glass with out blinding yourself by having to look into the raw light beam.
Of course, you can also see the effect this has when looking at the screen and being able to slide the lens left or right whilst projecting a test pattern of similar high detailed image.