Equipment & Techniques > Cameras, Lenses and Shooting gear
High resolution, scaled focus dial for the Actus??
Hening Bettermann:
Hi!
would any of you see a possibility to replace the focus knob of the Actus by a wheel with a dial that allows me to read say 0.05 mm of focus travel?
Well my purchase of an Actus is not immediately imminent. But if I can not get something like this, I will consider the camera unsuitable for focus stacking and drop even the thought of it.
Using the lens helicoid is not an option, because the point in getting the Actus would be to get the Schneider lenses for it in the not too long run, and to be able to use my Apo Fujinon 180 and Apo Ronar 300.
Good light!
BobDavid:
As far as I know, the answer is no. I used an Actus for a few years. Great camera. But it has its limitations: The absence of micro focusing gears with a precise scale for focus stacking and a lack of finer gearing for swings and tilts. A hard detente for swings would be a welcome feature. The amount of swing and tilt movement required for mft and 35 FF are often a fraction of a millimeter. ... I used the Actus as a platform for copy stand photography and as a field camera. It is a good performer in the field, if you are careful to magnify live view for critical focus and for swings and tilts. It's an excellent field camera so long as you are methodical about setup and taking test frames to ensure adjustments are tuned for optimal results. It's a wonderful camera for stitching both in the field and for copy stand work.
Hening Bettermann:
Thank you for your reply, Bob. - Strange that nobody seems to lack this - or says so.
I should have made it clear that I'm talking about the Actus Mini for the a7r2, maybe the GFX later. If you say that you have used it for years, you are obviously referring to an older, "normal" Actus.
Hening Bettermann:
Do you think (something like) this could be used?
http://www.farnell.com/datasheets/2047529.pdf?_ga=2.26620794.613482938.1494246817-1540928351.1494245462
Maybe it could be mounted instead of the focus knob? That alone would do for focus stacking.
But maybe we could even get Scheimpflug by the numbers? If we could
-mount this device instead of the tilt and swing knobs as well
-team up (as kick starters?) to hire a genius to write an iPhone app that
--translates the focus numbers to millimeters, and the the tilt and swing numbers to degrees
--allows us to manually enter the on-screen distance between 2 focus points
--translates these points to distance-on-sensor
--calculates the Scheimpflug angle from this distance and the focus difference
??
Another question: The Farnell data sheet says "vernier reading". I don't hope this is true, and I can not see a Vernier scale, just a single number in the window. ?
alan_b:
Depending on how much of a DIY project you're up for, a follow focus knob could be rigged w/ gear reduction.
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