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p.1 #6 · p.1 #6 · Printing Nikkor 150mm at 2:1 on Full Frame: Improved Images | |
What surprises me is the lack of curiosity as to how I got the image to fill the full frame.
Using a teleconverter for a given format only enlarges the centre of the image, the resulting image having the same size of image circle as there was without the TC. That is what this mini project is about, not, primarily, about which lens is the best for the job.
So, why do I have a full frame Sony A7R? This is primarily for use with my legacy ultra-wide angle lenses, one of which (24mm) has shift for architectural use. There is little point in using such a lens on m4/3, where it becomes a boring 48mm.
Last year I invested in, as soon as it was available, a Laowa 12mm lens, the first time I have own such a short FL for full frame. I also had in mind that Laowa were planning a "Magic Shift Converter" for this lens. It would provide a shift mechanism and widen the image circle to permit this. I had in mind that it might do a good job of shifting my superb Pentax 15mm, plus various legacy WAs. Mine reached me in time for Christmas.
The MSC comes (currently) in two versions, for EOS or Nikon AI mount, the latter for my Laowas. Essentially, it did all that I expected for the Laowa 12mm and my other AI mount WAs. It seems to me that there must be a medium format x1.4 TC in the converter, which stretches the whole 35mm fomat (43mm) image circle by x1.4..
So, having been frustrated that the better of my two Printing Nikkors, the 150mm, could only be used on m4/3, I now saw a potential means of using it on full frame. I had a mount adapter from Olympus OM to AI specially made and I find that, with a tiny amount of vignetting in the corners, I have what I hoped for.
So, the effective aperture used for these images was f14.
Harold
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