![]() ![]() So I would expect it to do the same with focus too. I think this is very useful, because the batch scan can take a long time, and it's nice to be able to go away, and not have to be present to set the focus point on each frame.įrom the little I’ve used VueScan (I only use it to scan APS film) that is how it works with other settings - do a preview of each image, go through and set up the crop of colour etc per image and then do a full scan. This tells me that Vuescan is doing the right thing: it is storing the different focus point locations I specified for different frames, and using them when doing the batch scan. Then I did a "Scan".įrame#1 came out in focus the right side of frame#2 (that was elevated) was also in focus, while the left side was out of focus. ![]() I went to frame#2 and set the focus point to lie on the right side (where the film was elevated above the normal level) in frame#1, I set the focus point to the left side. I set "BatchScan | On" and "AutoFocus | Scan". I used a plain slide in frame#1, and put the "split level" test slide in frame#2. I made a test slide that's split, with two different "heights": on the left side, the film is in the same plane (same height) as a normal slide, and on the right side, it was raised the thickness of two slide mounts. ![]() I decided to do a test to see if this is done. It seems to me that if I preview all 5 slides, then set the focus location manually for each of them, Vuescan ought to be able to remember those X,Y pairs and use them when it does the actual scans in batch mode. This is probably more of a Vuescan question, than a general scanning or Nikon one. I wonder if others have dealt with this problem, and if so, how. But it appears to me that it doesn't actually retain the 5 distinct focus points that I set for the 5 slides), but rather just uses the first one. I thought perhaps it would work to batch preview the slides, then manually set the focus point for each one, and then batch scan. This seems to give good results, but does not allow batch scanning (the user must manually interact with Vuescan between each slide) - and this scanner is SLOW. Then scan the image with "Auto focus" set to "Scan" so that focus is done at the individually defined focus point, just before the scan. On each one, first do a preview, and then manually set (by moving the focus "cross hair" icon) the focus point to a spot that is not too near the center of edge of the slide, typical of the most interesting part of the image, and with some texture upon which to focus (such as an edge between very different brightnesses). ![]() The way to get the best result seems to be to step through the five slides individually. This would be a decent solution, except for times when, for a particular slide, the focus point lies on a part of the image with no edges or texture for the focus algorithm to use. As I understand it, Vuescan will have the scanner focus each slide at the specified X/Y focus point, before scanning it. Then (in the "Input" tab) set "Auto focus" to "Scan", and "Batch scan" to "All". The simplest thing is to set the focus point X/Y midway between an edge and the center of the transparency, to "split the difference" on a "cupped" slide. I am confused about how to achieve good focus, while still being able to batch scan. I am scanning mounted 35mm slides (using the 5-slide film carrier) in my Nikon LS-8000, using Vuescan. ![]()
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