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Raynox-on-Raynox: no camera lens or objective

 
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Lou Jost



Joined: 04 Sep 2015
Posts: 3840
Location: Ecuador

PostPosted: Wed Mar 15, 2017 6:51 am    Post subject: Raynox-on-Raynox: no camera lens or objective Reply with quote

We use Raynoxes both as tube lenses for objectives and other lenses, and also as close-up lenses attached in front of other lenses. I always wondered what would happen if we just skipped the other stuff and made a whole setup with nothing but Raynoxes--- a Raynox tube lens with a Raynox close-up lens in front of it. This morning I tried it.

I used the best Raynox for the tube lens: the Raynox DCR-5320. I used the lowly Raynox DCR- 250 as the "objective". I used a 16mm paper aperture between the two lenses (that is essential; wide-open you just get mush). This gave me about 2x magnification. Working distance was an insane 100mm.

I was shocked at how good it was in terms of lack of color fringing, which is a problem for many of my "real" lenses. It won't win any prizes but it is interesting to see what it does. Here is the full image, and then a 100% crop, both of jpgs straight from the camera except for exposure adjustments.




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zzffnn



Joined: 22 May 2014
Posts: 1819
Location: Texas USA

PostPosted: Wed Mar 15, 2017 8:13 am    Post subject: Reply with quote

Thank you for sharing!

There isn't much CA. However, resolution seems less than your previous stacked lenses. Is the effective aperture here much smaller?
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Lou Jost



Joined: 04 Sep 2015
Posts: 3840
Location: Ecuador

PostPosted: Wed Mar 15, 2017 8:55 am    Post subject: Reply with quote

This is in standard (not hi-res) resolution (20Mp) for the Oly PEN-F, since it is not pixel-sharp. There's not much point in using the hi-resolution mode (80Mp) if the normal image is not perfectly sharp. I don't recommend this combination of lenses for serious work, it was just a fun experiment, but impressive nevertheless, especially with respect to CA.
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