Sony RX100 M4: Slide Copier with Dörr Slide Duplicator

The Dörr Slide Duplicator | Sony RX100 M4 Connected to the Dörr Slide Duplicator | Sample Slides | Some Experiences and Tips | Dealing with Contrast | Conclusions | References

On this page, I describe how I use the Sony RX100 M4 together with the Dörr Slide Duplicator as a slide copier.

See also page Slide Copier with Dörr Slide Duplicator (RX100 M1).


The Dörr Slide Duplicator

Since there are about 40.000 slides in my home that await to be digitized, I made several attempts at copying slides, all of them without success. One on these attempts was the Dörr Slide Duplicator, a device that is mounted to a camera using the filter thread of its lens. I bought it hoping that I would some day own a camera that I might use it with. However, since it requires a lens with a focal length of 100 to 110 mm for format-filling slide copies, I never succeeded. On the other hand, my cameras that would offer such a focal length did not have filter threads. So, the only thing that I have used so far is the +10 achromat that is built into the slide duplicator but can be removed and used as a close-up lens.

Photo: The Dörr Slide Duplicator - and a couple of slides...

Things changed a little bit, when I bought adapters that supplied our Sony RX100 cameras with a filter thread. For my Sony RX100 M4, I bought a Lensmate filter adapter that is glued to the lens. This allows for a fairly stable connection between the lens and the slide duplicator. But this camera has only a focal length of 70 mm (equiv.), far to less for being useful for duplicating slides. For my wife's RX100 M1, on the other hand, I bought a Carry Speed MagFilter magnetic filter adapter which makes the connection between lens and slide duplicator rather instable. This actually results in a rather quirky setup. Nevertheless, for some reason, I needed to copy some slides und therefore tried out this combination. It is described on page RX100 M1: Dörr Slide Copier.

In the following, I present some photos and experiences with the RX100 M4 and the Dörr Slide Duplicator. The mechanical connection between the lens and the slide duplicator is much more stable, but with a focal length of 70 mm (equiv.), the copies are considerably smaller than when using the RX100 M1 at 100 mm. Nevertheless, in some cases the resulting size of the copies may be sufficient, and therefore I describe this combination here.


Sony RX100 M4 Connected to the Dörr Slide Duplicator

When I decided to use the Sony RX100 M1 with the Dörr Slide Duplicator, I first had to collect all the things that I needed for this procedure: The camera, the MagFilter??? adapter, the Dörr Slide Duplicator, a tool for dust removal, spare slide frames without glass to be used during the copying, some support for the slide duplicator and the camera so that both are aligned straight, and of course, the slides to be copied:

Photo: All the parts that I needed for coping slides with the Sony RX100 M4 and the Dörr Slide Duplicator (and maybe, some more...)

The Dörr Slide Duplicator has a 52 mm filter thread, and luckily, the Lensmate filter adapter has the same filter thread, so no further step-up or step-down rings are needed.


The Dörr Slide Duplicator with slide and Lensmate adapter ring


Ditto, adapter ring attached


Ditto, side view


All in all, the slide duplicator can be regarded as a hugh filter that is mounted to the Sony RX100 M4. The next step would now be to attach the Lensmate filter adapter to the lens. With the Lensmate adapter, no support is needed, since the connection between the slide copier and the lens is fairly stable:


Camera attached, ready for copying a slide


Ditto, turned around


Ditto, with slide in copier, ready for copying a slide


Ditto, slide removed

As can be seen, the whole setting can be simply put on a table...


Sample Slides

I used a slide taken in my youth showing a butterfly to demonstrate slide copying with the Sony RX100 M4 and the Dörr Slide Duplicator. Obviously, this was not the best slide for this purpose, but it demonstrates the procedure.


Original copy, but rotated 180 degrees (original)


Ditto, brightened up to indicate the size of the copy (original)


Slide copy leveled, cropped, and slightly processed; no dust removal (original, 3467 x 2311 pixels)


Ditto, some dust removed in Adobe Photoshop Elements (original, 3467 x 2311 pixels)

Steps in Adobe Photoshop Elements

I ended up with a slide copy of 3467 x 2311 pixels, which might be slightly enlarged to 3600 x 2400 pixels (see this version) for the sake of "simpler numbers." This pixel size leads to the following print resolutions:

Thus, this size is still perfect for postcards and acceptable for paper sizes up to DIN A 4 (400 pixels per inch would be better, though...).


Some Experiences and Tips

In the following, I present some of my experiences, ways to do it, and tips:

Taking the Slide Copy

Camera Settings

Processing the Slide Copy

I do all the processing of the slide copy in Adobe Photoshop Elements, because that is the photo editing application which I am most familiar with. The processing steps may involve straightening and cropping the slide, adapting color, brightness, and contrast (which I subsume under "processing", and finally removing dust spots.

For leveling (or straightening) the slide, Adobe Photoshop Elements offers the Straighten tool (German: Gerade-ausrichten-Werkzeug). Sometimes, I need several attempts before I like the result. Luckily, there is an "Undo" command available...

I use the Marquee tool and then the "Crop Image" command for cropping, others might prefer to use the Crop tool...

Depending on the slide and the dust on it, removing dust in an image editing application will take some time and may even be impossible, if there is too much dust. In Adobe Photoshop Elements, I use the Spot Healing brush (type: content aware or proximity match) (German: Bereichsreparatur-Pinsel) for this purpose. Larger areas might also be repaired with the Healing brush (German: Reparatur-Pinsel), which copies areas to a new location (similar to the Clone Stamp tool, but more discrete; German: Kopierstempel). Automatic dust removal, as better slide scanners offer, is much better and simpler!


Dealing with Contrast

In the following, I explore the effect of lowering the contrast (to -3, that is, to the minimum value), as well as of using HDR (set to Auto), which should also lower the contrast and make more details visible. I used two differnt slides for this test and only cropped the photos, but did not do any postprocessing (EV was set to 0). I also did not remove any dust in post-processing.

Note: I flipped the butterly horizontally when taking the photo, because this seems to be the correct orientation.

Slide 1


Contrast 0 (original, 3480 x 2320 pixels)


Contrast 0, HDR Auto (original, 3480 x 2320 pixels)


Contrast -3 (original, 3480 x 2320 pixels)


Contrast -3, HDR Auto (original, 3480 x 2320 pixels)

Section (Butterfly)


Contrast 0 (original, 3480 x 2320 pixels)


Contrast 0, HDR Auto (original, 3480 x 2320 pixels)


Contrast -3 (original, 3480 x 2320 pixels)


Contrast -3, HDR Auto (original, 3480 x 2320 pixels)

Slide 2


Contrast 0 (original, 3480 x 2320 pixels)


Contrast 0, HDR Auto (original, 3480 x 2320 pixels)


Contrast -3 (original, 3480 x 2320 pixels)


Contrast -3, HDR Auto (original, 3480 x 2320 pixels)

Section (Front of Caterpillar)


Contrast 0 (original, 3480 x 2320 pixels)


Contrast 0, HDR Auto (original, 3480 x 2320 pixels)


Contrast -3 (original, 3480 x 2320 pixels)


Contrast -3, HDR Auto (original, 3480 x 2320 pixels)


All in all, both lowering the contrast or using HDR set to Auto bring out more details, but HDR also changes the overall impression of a photo, which may be welcome or not, depending on ther respective photo.

Using both lower contrast and HDR in conjunction seems to have a too strong effect for me, but may be this is usable for certain photos, particularly ones with very high contrasts.

For the butterfly, my persomal favorite is HDR set to Auto with normal contrast, for the caterpillar, my persomal favorite is contrast set to -3.

Note that you can improve the results with post-processing considerably, these are just starting points.



All in all, it can be done, but the results may disappoint you (depending on the original slides...), and it may also take quite some time until you have arrived at satisfying results. Having slides copied by a respective company is much simpler, but comes at a cost.

For copying just a few slides, using the described setup may fulfill its purpose (up to the size of a postcard and a little more), although the higher resolution that you get with the Sony RX100 M1 (4800 versus 3400-3600 pixels horizontally) is to be preferred...

As my investigation shows, the results can be improved when either contrast is set to the lowest possible value for Creative Style or HDR to Auto, but not both. This makes it a little difficult or cumbersome to test all the possible settíngs for best results... At least, when you use HDR you also get a "normal" version of the slide, that is, two samples to choose from...

The Lensmate filter adapter provides a much more stable setup than the MagFilter magnetic filter adapter on my wife's Sony RX100 M1.




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