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Absolutely gorgeous Wayne!First field trip with my new Alpa setup. Nothing spectacular, but a couple of nice things. I enjoyed the experience and challenge of using the system, and was really pleased with the sharpness of the files even into the corners.
Alpa 12max, Schneider 47mm XL, PhaseOne p65+
Oh go ahead - you know you need it, or is that want it?Hate looking at images from the Alpa it just gets my buy button shaking like crazy. LOL
Alpa made a prototype, the Alpa 12 SST - 25mm rise & fall, 25mm shift left & right with a sliding back. They must have seen something they did not like. I wonder if anyone has tried one. Apparently, they made five of them. Would be nice to try one.My dilemma is I also want a sliding back. ALpa says there is no way you can get a sliding back to hold enough precision for high-res digital, but Arca disagrees.
Simple mechanical systems can easily hold position within 1/10,000 of an inch if you want to spend the money. I've designed a number of them....I also want a sliding back. ALpa says there is no way you can get a sliding back to hold enough precision for high-res digital...
It would be nice. I just did the infinity calibration setup with the Alpa, and was actually surprised at how much difference adding .05mm distance was so maybe there's something to what Alpa claims.Yeah, I want one too. My dilemma is I also want a sliding back. ALpa says there is no way you can get a sliding back to hold enough precision for high-res digital, but Arca disagrees. In my ideal world, I'd own the Arca RM3D with the Arca Rotaslide, but the Alpa is close second...
Jack - the arTec is YOUR camera (actually mine, too ). Integrated sliding back (therefore no issues with alignement), shift and tilt&swing at all focal lengths...Yeah, I want one too. My dilemma is I also want a sliding back. ALpa says there is no way you can get a sliding back to hold enough precision for high-res digital, but Arca disagrees. In my ideal world, I'd own the Arca RM3D with the Arca Rotaslide, but the Alpa is close second...
it's impossible to focus a wide angle lens accurately enough for infintiy on the GG...However, it certainly seems possible that a sliding back can hold precision. Maybe it can't be tuned into "infinity" as precisely, but if you are focusing with loupe on the ground glass, not sure the infinity thing really applies.
Just having the sliding back integrated with the camera body does not insure perfect alignment. The issue is disparity between the exact GG plane and the exact sensor plane.Jack - the arTec is YOUR camera (actually mine, too ). Integrated sliding back (therefore no issues with alignement), shift and tilt&swing at all focal lengths...
Sinar knows how to make cameras... I think precision is not a issue here. And even if, I think it's not a big deal to adjust the GG to the exact same distance as the sensor of your digback.Just having the sliding back integrated with the camera body does not insure perfect alignment. The issue is disparity between the exact GG plane and the exact sensor plane.
Imagine how different things would be if they can ever implement live view on an MFDB back with a decent LCD display and 20x zoom for focusing. May never even put a ground glass on the camera.Just having the sliding back integrated with the camera body does not insure perfect alignment. The issue is disparity between the exact GG plane and the exact sensor plane.
It's not only the same distance that is critical, but also having both be perfectly perpendicular to the lens centerline!, I think it's not a big deal to adjust the GG to the exact same distance as the sensor of your digback.
No offense, but this is totally IRRELEVANT if you are using the calibrated GG above to focus, even if your lens happens to over focus infinity!!! However, *IF* you are zone focusing, then yes, calibration is important.It's more important that the lenses resp. the sensor spacing is calibrated acurrately for infinity.
For sure! FWIW, the Betterlight scanning back has an electronic live-view histogram focus -- this was so accurate you could actually choose which color CHANNEL you wanted in perfect focus! You could see each channel bar in the histogram maximize contrast as you racked focus. It also proved that most APO badged lenses were not truly APO!Imagine how different things would be if they can ever implement live view on an MFDB back with a decent LCD display and 20x zoom for focusing. May never even put a ground glass on the camera.
this applies to all cameras; not sure why it would be more critical with tech cameras. All the manufacturers work within tolerances of 1/100 mm. With Tilt/Swing things may become more complicated depending on how it is bulit. The arTec has a safe zero lock and as far I am concerned I'd say it works reliable.It's not only the same distance that is critical, but also having both be perfectly perpendicular to the lens centerline!
with helical focus mount when the lens does not quite reach focus at infinitiy (i.e. it focusses slightly closer than infinity) you'll have a problem that is not exactly "irrelevent". In this case the image may very well appear to be sharp on the GG but it won't in the final capture. The other way around: the slightest focussing beyond infinity will render the capture soft... even a lot of DOF won't help. For focussing at closer distances you are right... any infinity calibration of the lens isn't necessary (like on a view camera) but an acurrate alignment of the GG is mandatory.No offense, but this is totally IRRELEVANT if you are using the calibrated GG above to focus, even if your lens happens to over focus infinity!!!
of course a lot of horrible things can happen all the time...Of course gentlemen - lets not forget t make sure that teh chip in teh actual back is aligned perfectly..hmmm