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That's exactly what Arca did with the RM3D John -- the helical has a 2.5mm thread pitch and minimal thread clearance -- and it's why it's on the body and not the lenses...what all this points to is a shortcoming of the helical focus mounts. who makes these, and why can't they change the thread pitch to something more like 3-4mm? these new lenses have been mounted on pre-digital helicoids with a way too coarse pitch
The more I use this camera, the more I love it. Heck, my entire Phase DF kit may be up for sale soon :ROTFL:
Well I would if I did, but I seriously doubt it will ever come to that reality. But I do understand the sentiment! :ROTFL::ROTFL: You mean I would have the last laugh. You will never give me that pleasure.
3 months and you are over it. Trust me you'll find your art slide. Its not really your style. I just know you too well. I know slowing me down would kill my artWell I would if I did, but I seriously doubt it will ever come to that reality. But I do understand the sentiment! :ROTFL:
Perhaps Milich Machining should offer a proposal?so all that cambo/alpa have to do is make a new design finer picth helical mount and offer that on their lenses. I wonder who makes those for them?
so all that cambo/alpa have to do is make a new design finer picth helical mount and offer that on their lenses. I wonder who makes those for them?
with all due respect, how can the focus resolution of the alpa, if full range of rotation is less than one revolution, match the arca, which has several rotations for the same lens travel?
And to say that it could be even more precise is just wrong.
with all due respect, how can the focus resolution of the alpa, if full range of rotation is less than one revolution, match the arca, which has several rotations for the same lens travel?
Correct, it cannot -- and very well stated on all points. All good systems, but the heli-mount has limitations.It can't. And yes I had both cameras side by side. And to say that it could be even more precise is just wrong. While the Alpa is a great camera, it has the same limitations and benefits from the normal heli mount.
Thierry,Jim,
No harm at all.
Please read what the member says in Post 63,
jack: i kind of like the ambiguity all those verticals give in my name.
Did they test for precision directly against Arca? If so, I'd like to hear from them exactly how they found Alpa "superior." Or is more accurate that they just found that the Alpa was "sufficient" for their needs? In this case, I have no argument. I know Mark Dubovoy was not happy at all until he shimmed.But could Andreas Gursky, Walter Niedermayr, Mark Dubovoy, Candida Hoefer, Raymond Depardon, Ardon Bar Hama, Raymond Meier, among many other top-photographers all be that wrong when they choose Alpa because it gave them the most precision in focusing and fine-tuning among all cameras available?
Agreed in that whatever works best for an individual is what they should choose.With all due respect for anyone here, and theoretical precision and literature put aside, it's the practical use and the resulting images which speak for themselves, nothing else.
Please then define what you mean by "precision" for us Thierry. The Arca by any *mechanical definition* is more precise, period. You may have a different definition which I'd like to hear. Finally, you keep saying it is irrelevant in use, and that may be true for some folks, but that is a different discussion and does not change that fact that by a true mechanical definition, the Arca helical is more precise than the Alpa's. Just trying to keep the facts correct here .But pretending like it is done in this thread and some others that all of a sudden Arca is the non-plus-ultra in focus precision is going a little too far and not the truth.
I know Mark Dubovoy was not happy at all until he shimmed.
Please then define what you mean by "precision" for us Thierry. The Arca by any *mechanical definition* is more precise, period. You may have a different definition which I'd like to hear. Finally, you keep saying it is irrelevant in use, and that may be true for some folks, but that is a different discussion and does not change that fact that by a true mechanical definition, the Arca helical is more precise than the Alpa's. Just trying to keep the facts correct here .