 Posted: Wed Sep 29, 2021 1:54 am Post subject: |
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Ray Parkhurst wrote:
Before I got the A7Rm4, I used Super-Resolution technique to improve image sharpness and color fidelity. Both the pixel-shift and SR technology can result in higher MP count, but they do it in different ways. Pixel-shift moves the sensor by fixed sub-pixel amounts, while SR assumes the subject is moved by random fractional-pixel amounts. With enough samples, the SR can give a good 2x linear (4x in pixels) increase in resolution. The A7Rm4 can give a similar 2x linear by taking a 4x4 array of shots. Of course it is not a MF camera, though with its 61MP native sensor, the resulting image is ~240MP, similar to these MF results.
I have also done a few types of stack and stitch to achieve MF-like results, and with this technique the result is similar in perspective to what you'd get with a true MF camera. I've shot many S&S shots with an 18MP APS-C sensor, with ~90MP final images. I did most of these with "subject pan" technique, where the camera and lens was moved across the coin, with lighting fixed relative to the coin. I recently modified my system to allow "sensor pan" technique, which moves the camera across the image circle of the lens, holding the lens, coin, and lighting fixed. This is more like a true MF result, but in this case it is not with the addition of any resolution-enhancing technique, so the final image is still in the ~90MP range.
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...See my Numismatic Photography website at: http://www.macrocoins.com
...Primary Studio Cameras: Sony A7Rm4 and Canon HRT2i
...Go-To studio lenses: Nikon 95mm and 105mm Printing-Nikkors; Schneider 85mm Macro-Varon; Nikon 5x, 10x, and 20x Measuring Microscope Objectives; Mitutoyo BD Plan Apo 50x Microscope Objective
...My Go-To Walkaround Lenses: Laowa 60mm Super Macro; Nikon 28-105D (in manual mode for macro); |
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