Informative video;
I just did 10.000 scans of all my 35mm slides with a Nikon DSLR and a macrolens.
It works but with many scans you have to prepare it it a little better than the man in the video, or it takes too long.
Still even with slides it is still some work to get color, lightness and contrast.
One point he makes was kind of funny: with DSLR you have to be there all the time, with the Epson you can take a coffee...
His conclusion is he prefers the Epson. My conclusion i prefer to have scanned 20 slides in the time Epson does one.
His video is more about producing one good scan... so that does not bother..
His example of using a 6 x17 film is a bit odd; if you use 35mm the slide can be much sharper ( depending on the film)
also the idea to stitch mulitple scans with a dslr of the 6x17film is odd; you know it is not going to work.
while his test is about drum vs DSLR vs Epson flatbed; he demonstrates that it is not the machine, but the persons craftmanship that makes the difference in many cases.
One thing i like about DSLR scanning of Slides: i can bracket the exposure to get even the darkest area's. I suggest a -2, 0, +2 stop bracketing and F11-f13 ; maybe F8 will be a bit crisper; sharpness failures are more often; the bracketing makes sure you have every detail without needing to check everytime.
I have found out that scans with a DSLR from a BW negative are sharper than flatbed scans of a 8x10 inch print.
However; the print is a selection of what is on the negative; you have to make that selection again.
I have not much problems with dust using a DSLR; had a lot more problems with dark area's in scans from print.