Showing posts from September, 2020

New experimental feature - QR codes for resolution measurements

 The central part of the chart has been changed: instead of the "black hole" another USAF 1951 pattern has been placed right in the center of the capture area. Along with it there are number of square QR codes of different sizes. The smallest one still resolvable by a QR reader should be the measure of resolution. Each QR code encodes web address (URL) pointing to the individual web page on site . That page will eventually contain information about the specific resolution once the value is crowd-sourced from fellow digitizers like you. More details will be added soon.   The QR code online reader ( not affiliated with Vlads test target  ) is located  but other sites can and should be used as they may use different technologies to recognize QR codes. You may simply drug-and-drop the central part of the scanned negative to this site and observe which QR codes get resolved and click the link on th

Type 120 targets

  Quite a few folks IM'ed me if Type 120 targets will be available any time soon. The answer is yes, i am working on that. The issue with the type 120 design is that folks have different film formats: 6x4.5, 6x6, 6x7, 6x8, 6x9 - that means that the target will be comprised of at least two adjacent frames of 6x6 ( i will be shooting with Pentacon Six i own) so USAF patterns should be located across the frame in such a way that by repositioning the film in a holder each person will be able to have one pattern in the center and couple of them close to the corners. Most likely that means that 6x6 frame will have nine USAF targets and may be more. The gap between frames on film might fluctuate - that's known issue with the Pentacon film advance mechanism. My current 36x24 design will not work so all new chart has to be produced, printed and glued together. If anyone has a better idea or want to lend me (or at least recommend particular camera make i can rent from Adorama) of a