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Hi Luka
I you hold up your F/W (with adapters you expect to use in front and back of it attached) to a large bright screen (e.g. computer monitor) and experiment with looking through and moving your eye closer and further away, you'll start to see how quickly the tightest part of your lightpath (generally your filters, but sometimes M42 connectors before or after the FW) is adversely affected as your "CCD" get further away from the FW.
Getting the CCD in 10mm closer to the FW makes a huge difference to reducing vignetting on my rig.
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