After my last post regarding the Cosmicar 8mm f/1.4 CCTV C-mount lens I have purchased a revers mounting ring for micro four thirds. It’s a 55mm to M4/3 mount mounting ring, which is too large for the Cosmicar. I have therefore attached the lens to two step-up rings – a 40.5mm to 52mm and a 52mm to 55mm. It’s not an ideal solution, but I wasn’t able to find a reverse mounting ring with a smaller filter thread. Anyway it works and surprisingly well at that. I haven’t calculated the maximum magnification ratio, but it puts all my other macro setups to shame. See the anthers in the following photo which was shot with the reverse mounted Cosmicar 8mm f/1.4 on my Olympus OM-D E-M10?
The following is a single rolled together petal of a not fully developed Tagetes erecta (Mexican marigold) flower. It has a diameter of around two millimeters.
And last shot I want to show you is a very small part of my index finger.
This is what the setup looks like.
Now a few words on the ease of use or more precisely the lack thereof: With such a huge magnification ratio it is very hard to get things into focus. Depth of field is literally razor-thin. You have to rock the camera back and forth, stop at the right moment and try to not move the camera too much while pressing the shutter release button. You also need a flash and a powerful one at that. I shot all of the photos with my Meike MK320 attached and set to full power (!). This should tell you that the lens doesn’t let much light through, when it’s reversely mounted. With a DOF as thin as this, this setup is best suited for photographing very small static subjects (like very small plants). To avoid frustration due to an enormously high reject rate it’s best to use a tripod. Doing focus stacking seems almost mandatory, unless you are going for an artistic look with super-thin depth of field.
Stay tuned for more shots with the Cosmicar 8mm f/1.4 CCTV C-mount lens. 🙂
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