Best/Easiest DIY Slide Copier For Fun & Profit (4K)

A DIY slide copying rig. Some pointers follow.
Note: You can buy ready made slide carriers, just google "film carrier".
Need:
Camera/lens to be able to focus close enough for slide to fill sensor. Zoom lens. 12-45mm M4/3)
Slide holder (hold 90 degrees to lens in all dimensions)
Dark tube (length based on lens at distance for slide to fill sensor) Keeps out ALL light.
Big, bright, consistent light source at a distance.
1) Bright (white), flat light source.
a) Color balance for your camera settings
b) CONSISTENT artificial light is best (no fall off or hot spots)
c) No visible patterns from light (move light as far away as possible, see depth of field)
d) Avoid finger/equipment shadows
e) Make the light source square to the slide, at the same level
2) Open f-stop. Minimum depth of field = open f-stop (WANT a blurry background past the slide)
2.a) BUT you need enough depth of field to compensate for slide curvature & emulsion thickness
3) Small ISO for maximum resolution
4) Aspect ratio 3:2
5) Focus across the slide (flatness) 90 degrees all directions to lens
6) Emulsion side of slide towards camera for sharpest images. Photographing through the clear plastic backing lowers sharpness. However you may need to flip the image horizontally with a photo editor
Note: There is always be loss in color/sharpness in making any copy. The goal is to minimize losses.
Also, some lenses are not good at this, as they may not provide sharp focus away from the center of the image. You want a flat field lens. Many macro lenses are good and they should not need an extension tube.
3D Printer Files: www.thingivers...
================================================
NOTES:
1) Your tube diameter will vary with your lens diameter
You might be able to use PVC plumbing pipe rather than print one
2) Your tube length will vary with your lens / extender
3) Seal the tube against light leaks
My Camera: Lumix GX-8. M4/3rds
My Lens in the video: 14-45 with 10mm extender tube BUT
I found after that the left and right edges are not sharp. I now use my Leica Lumix 45mm macro
This was designed to get slides in and out fast. I use my fingers (carefully)
to hold the slide in place (avoid finger shadows!)
FLAME the 3D print surfaces to remove any tiny strings!!!
Slide Dimensions (plastic): 50mm x 50 mm x 1.75 mm
Opening: 34.72 mm x 23 mm The image is: 36 x 24 per standards ratio: 3:2
Diagonal is 41.18, so the pipe would have to be 42+ mm in diameter + camera lens.
Slide Dimensions (paper): 50mm x 50 mm x 1.75 mm
Opening: 34.72 mm x 23 mm
CAMERA: Panasonic Lumix GH-5 ii M4/3rds (= 2x 35 mm film camera equivalent)
Lens: 12-60 mm @ hood attachment 64 mm dia
PVC pipe: 2.5" ext: 75.2 mm int: 68 mm
CAMERA: Panasonic Lumix GX-8 M 4/3rds (= 2x 35 mm film camera equivalent)
Lens: 14-45 mm @ hood attachment 58 mm dia
PVC pipe: 2.5" ext: 75.2 mm int: 68 mm

[@tsbrownie]

My Lens in the video: 14-45 with 10mm extender tube BUT I found after that the left and right edges are not sharp. I now use my Leica Lumix 45mm macro.
A commenter made a good point: "Cyanoacrylate Adhesives give off fumes that if it permeates to your lens could well ruin it. You may need to keep all these parts (lens, holder, and tube) together for alignment purposes, if so, tack the tube and holder together with hot glue, get the lens away, and then finish with the superglue."

[@adnacraigo6590]

I never know what you're going to do next. Good design.

[@tsbrownie]

@adnacraigo6590 I never know what I'm going to do either. I just video what I happen to be working on, assuming I think anyone might be interested. Had a couple of failed radio experiments since the last time. Now I'm trying to repurpose that extra loop coil I made. Suggestions welcome.

[@amtrain]

For the love of god, do not superglue the holder and the tube together while the camera lens is anywhere close. Cyanoacrylate Adhesives give off fumes that if it permeates to your lens could well ruin it. You may need to keep all these parts (lens, holder, and tube) together for alignment purposes, if so, tack the tube and holder together with hot glue, get the lens away, and then finish with the superglue.

[@tsbrownie]

Good point. I have copied part of your comment to a pinned comment.