Macro with free Olympus 52.48mm 6.22

[jamaeolus]

I finally caved to temptation and bought a Staeble Tetragon 135mm 4.5 from C & H Surplus. They have a bunch of NOS lenses, along with all manner of widgets and gizmos. Anyway when it came in there was a nice card from Rick noting that he had included a couple of "free prizes" . One was a Friedrich Munchen Axinon 4.5cm f4.5 enlarger lens which ironically was lens I had been eyeing as I have several other axinon in other FL. The other gift was the subject of this post. The Olympus is a small barrel lens 25mm by 41mm overall, has no mount. It came in a box indicating it is a part to some 3M device. I used a RMS adapter which one end would fit and the other would not so it slid about halfway down the barrel. I then stuck in place with my favorite reusable putty, Blu-Tak. An m39 to m42 ring and a couple of extension tubes to an m42 helicoid next adapter and I was good to go.

[kds315*]

Yep, an excellent MICROFICHE READER LENS this Olympus is (they made many different ones) and the clearly shows! CONGRATS!

[Ray Parkhurst]

I have a bunch of these, as well as other focal lengths. I had Raf make an adapter to mount the ones with cone-shaped mounts. For the ones without mounts, they are easy to convert to C-mount by taking a 5mm C-mount extension and epoxying it to the end of the lens, making sure it is centered and square before the epoxy sets up. The f6.22 is fairly limiting for resolution and sharpness, and the lens coverage is only reasonable, but there is a nice sweet spot at around 2.5x that works pretty well. Extension is still fairly workable at ~185mm (part of which is the camera register distance), and working distance is excellent due to the long focal length. The objective is operating at EA22, far into diffraction, but also has good depth of field so no focus stacking is required. I've been using them for coin detail photography and they hold up pretty well. Here's the date and MM of a 1955-S Cent:

[Max78]

Interesting lenses

I have two similar Tessars but with the longer focal length from CZJ. They have cylindrical shape with the diameter 25mm behind. So I use Minolta or Pentax Microscope Adapters with bellows to adapt them. These adapters are of a high quality and the lenses sit well and are automatically centered.

[Ray Parkhurst]