Hi, really impressed by exchange of info on this forum - has proven really useful - as such I am hoping you’ll be able to help me put. After ‘learning’ on APS/FF digital and having explored film medium format with a Linhof Technorama 617 + 72mm SK (what a piece of engineering!) and much exploring on the internet I am looking to invest in the Arca R-System primarily driven by drive to achieve best quality lenses on a ‘simple’ tilt system with good focus control on MF Digital. To this end the Factum with e-Cloud looks like it could really hit the mark. In the first instance I will be renting an IQ180 but am looking to invest in an IQ260-Achromatic longer term. So here are the questions a bit mixed and not in any particular order (and please excuse if a little naive) :
I normally do stitch panorama (via pano-head for example) in order to avoid distortion that is found for example at the edges of the 617 shots. Is the lens node for rotation the plane through the copal shutter? By the way I actually see an advantage of pano-stitching a tilted lens as opposed to normal vertical focus plane which also rotates the vertical focus plane . . .
My first choices for Lens with the IQ180 would be (Rodenstock) 40/70 as apposed to (32)/50/90 driven by LCC problems with the 32HR and much less(?) with the 40HR (as read elsewhere in forum . . .) Does this colour cast imply also a loss in ‘sharpness’ so that for best results (sharp across frame and no color-vignette to allow stitching) the 50HR would/should be ‘widest’ lens?
I will also be doing indoor ‘Macro’ work - single flowers etc. What would be a good macro lens recommendation to go with the Arca R-system assuming 90HR is not ‘long' enough’?
(I actually looked very hard at the RZ67 pro IID and if there had been a 32/40mm lens for this system that would tilt i would have been investing here instead and am still wondering whether the rz67 140mm Macro would justify this system on its own? - Price wise compared to a single Rodenstock lens it almost still works) For Info: One of the reasons for the IQ260-Ac in macro work is to obtain single shot B/W images through color plates to build later a ‘true’ color picture (every pixel sees every colour)
My understanding for the rz67 is that 50mm refers to 6x7 making it ‘equivalent’ to 46mm on 135 from the perspective of a 645 DB (due to crop relative crop of 645 digital back vs 6x7) whereas Arca R-lenses size is relative to 645 so that 50mmHR Rodenstock = 32mm on 135?
One other reason to get the IQ260 Achromatic is for the IR capability - I know where I lie here in the 135 world (Special Zeiss coatings - Coastal Optics 60mm etc. etc.) How are the Rodenstock lenses on the Arca for IR-transmition/ Focus / Central hot spot etc.? A better recommendation?
Many thanks for your help and time!, cheers, Mark