Hi Ian
I did use one some time ago for my Pentax *istDS DSLR and it did work as advertised.
However, I found it fiddly to fit the Stiletto device, focus it and then remove it to attach the Pentax camera. Now that I have a Canon 40D with Live View and my trusty Bahtinov Mask, I can achieve perfect focus more efficiently without that fuss.
I did have one early problem with the Stiletto system (no fault of the Stiletto) in that the T-Adapter on my Pentax *istDS had some play in it, which resulted in incorrect focus after the Stiletto had registered the correct focus. This was due to the slop in the T-Adapter which was fixed when I purchased a better manufactured Vixen T-Adapter for the Pentax.
Cheers
Dennis
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