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addy landzaat View Drop Down
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Posts: 13522 		Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 28 November 2022 at 22:24
Originally posted by Micholand Micholand wrote:

Not quite correct Addy.

Dmax is an abbreviation for the maximum density where detail can still be distinguished from pure black by a scanner (or densitometer). And Dmin for minimum density from pure white (lowest values not hidden by noise); and they are measured on a logarithmic scale.
With that the resulting dynamic range of a scanner can be calculated: 
DR = Dmax - Dmin

Some valuable info can be found here: https://www.scantips.com/basics14.html
That is why I said "more or less"
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pegelli View Drop Down
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Posts: 35126 		Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 30 November 2022 at 14:15
I scan negatives and slides on an Epson V700 photo "flatbed" scanner.

It has many resoution settings up to 12800 dpi, but I find that if I go higher than 2400 dpi I don't get any more detail or sharpness, only more pixels. 2400 dpi yields ~6MP for a 35 mm negative/slide which is usually enough for my intended purposes.

Can you set different resolutions on your scanner Anthony? That way you can up the ladder and determine the maximum realistic resolution after which no more improvement can be seen.
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Miranda F View Drop Down
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Posts: 4067 		Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 30 November 2022 at 20:37
Originally posted by pegelli pegelli wrote:


Can you set different resolutions on your scanner Anthony? That way you can up the ladder and determine the maximum realistic resolution after which no more improvement can be seen.

I don't think so. Looking at the scans in more detail it looks like the lens may need to be cleaned, but I can't find a way in!
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cordyc View Drop Down
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Posts: 49 		Post Options Post Options   Quote cordyc Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2022 at 03:05
I've done some slide copies on both an Epson scanner and using my camera, a macro lens and a light table or window.

The quality and color was best with the camera and macro lens. I have the Minolta 50, 2.8. The best color was taping the slide to a north facing window on a sunny day (pure daylight). The next best is using a light table. When I first tried this is wasn't happy with the color. So I went to Home Depot and bought a bulb with a high CRI index, a 92 I believe. This really improved the color in the copies. I find using spot focus works well and I get some of the white frame to so I can use the dropper to get "white balance" then I crop it out and make any other adjustments via lightroom. Also make sure you slide is dust free, I use a brush and bulb blower to do that.
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Miranda F View Drop Down
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Posts: 4067 		Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2022 at 08:50
Originally posted by cordyc cordyc wrote:

I get some of the white frame to so I can use the dropper to get "white balance" then I crop it out and make any other adjustments via lightroom.

Don't you try to eliminate all light from the front?
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gigo View Drop Down
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Posts: 423 		Post Options Post Options   Quote gigo Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2022 at 09:59
The easiest way is to use the flash as the light source.
A well-known method is to reverse-mount a standard zoom lens with a reverse adapter in order to shoot close to life-size without purchasing a new macro lens.

Edited by gigo - 29 December 2022 at 10:05
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cordyc View Drop Down
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Posts: 49 		Post Options Post Options   Quote cordyc Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2022 at 17:44
I actually did test with a 4 inch black pvc pipe fitting and eliminating the front light didn't really make a difference. The camera's metering took care of any exposure issues and the color was good. I did my tests during the day so I didn't have any extra room light and pulled the curtains too. The high CRI bulbs for the back light, I tested a few since I use them at home too, made the biggest difference in getting the true color on my old Kodachrome slides. Then I can use Lightroom or Capture 1 to enhance further and remove any flaws. The only other tip I can think of is make sure the emulsion side of the slide is facing away from the camera. Slides have a good side and a bad side.
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