Not a scanning back. You can see he used Ektar for the capture. The digital camera was used to "scan" the negative.
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@Tin Can
Since you mentioned 45 scanning backs...
Here's a recent one from my BetterLight system:
Attachment 239139
This is how I scanned with a Sony A 7r II digital camera and a macro lens. I put the negative on the Kaiser light table. I took a photo of the negative that was lying flat on the table with the help of coins in the corners. It's a very simple method and almost free. I opened the photographed negative in photoshop and there using the curves tool I inverted the negative and determined the colors. When scanning a 4x5 negative, it is easy to compare with 35 film because smaller film is not as flat. then you need a special holder that can not always flatten the film.
To better show this in the link below from minute 24:08 Brian shows the method I used to scan. https://youtu.be/jGt9p3rTmT4
Also here on YouTube I found the best method to edit the negative in photoshop.
https://youtu.be/ylIyA6wQGcY
Alex Burke is the author of a wonderful blog from which I learned a lot.
If you have any questions, I will be happy to answer them to be able to repay you for the knowledge I gained on this forum despite my poor English, a transtator often helps me.
Yaquina Bay, Oregon (Newport)
https://live.staticflickr.com/65535/...d7bfc9e6_h.jpg
8x10 Ilford Delta 100, developed in FA-1027
Deardorff + 240mm Symmar-S, plus polarizer
https://live.staticflickr.com/65535/...6d78ca0d_h.jpg
https://live.staticflickr.com/65535/...ed07cd54_h.jpg
Both FP4+ developed in LC29, Chamonix 45n2.