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Slide holding for Scanning - Ohnar and Other Options

Started May 21, 2021 | Questions thread
OP Halina3000 Junior Member • Posts: 32
Re: ...and now with Nikkor Micro 55mm f2.8

I've been on the lookout for a decent manual focus macro lens for a while and have now acquired a nice example of the Nikkor 55mm Micro at a fair price. I want the lens for taking new photos with the Canon (and it does that very well) but also wanted to do some comparative tests with the other lenses in the slide digitising setup.

After comparing several results and convincing myself that one image was sharper than another I've now concluded that the variation between images from the same lens is more than any difference in sharpness between slide images from the Nikkor 55mm and Rodagon 80mm. Choosing the best images from each lens I can find nothing to choose between them, either in the centre or at the edges.

I did the razor test at different apertures. The best number I got was 0.09 at f4 which is marginally lower than the best number from the Rodagon but having convinced myself that lack of rigidity was affecting some shots I am not reading too much into this.

The rig would need more work to allow better alignment, better rigidity and so on -  the Nikkor lens and extension tube hanging off the front of the Canon don't help. I shall continue with the Rodagon for digitising my slides because the bellows supports both the front flange of the camera and the rear of the lens.

A couple of 100% crops from the left hand edge of a test slide... not very inspiring subject matter I'm afraid.

Nikkor Micro 55mm f2.8 Image @f8

Rodagon 80mm f4 Image @f8-11

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