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The Ortec 425 is an excellent tip, Christian! That's what I need - they even have a nice CFD. I was googling around for digital nanosecond delays but the price for the ones with precise enough timing was a little steep...
A simple BNC surely would do the trick but I'd like to find the best delay empirically (I still don't know if better pulse lock-in of the sampling will make a difference at all). Given the many meters of cabling, convoluted optical path, and different fluorophores I'm using at my setup I wouldn't even know were to start calculating the correct delay and cable length.  The Ortec spans the right range of delays... so let's hope it's cheap enough.
Thanks everybody for the replys!

Best, Tobias
________________________________________
Von: Confocal Microscopy List [[log in to unmask]]" im Auftrag von "Christian Wilms [[log in to unmask]]
Gesendet: Samstag, 19. November 2011 01:50
Bis: [log in to unmask]
Betreff: Re: Fast two-photon imaging: Constant fraction discriminator and variable delay for Laser pulse-synch

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Regarding the delay: if you do not need it to flexible in timing,
simply getting a coaxial cable of the correct length (20 cm
corresponds roughly to 1 ns) is one option. A bit more flexible and
still affordable are variable delay lines such as the Ortec 425 <http://www.ortec-online.com/download/425A.pdf

Best, Christian