I agree with essentially everything Chris S. says. I have Mitutoyo M Plan Apos 2x, 5x, 10x and 20x on a Mitutoyo FS-60 microscope with automated stacking, and it is good to have them filling up all four mounts in the turret. The 2x is certainly the most limited of these four in IQ, probably because ...

Continuing through my boxes of legacy lenses, some of the lenses below are legacy lenses for photomacrography that have been discussed on PM.net at one time or another. Others are large- to very-large-format lenses that might be of interest for use in a specialized darkroom, or on large-format camer...

EL Nikkor lenses, various types, each in EL Nikkor plastic jar (jar may display scratches). All lenses in good to very good condition, send me PM if you want pictures of a specific lens and I will add them to this ad. Shipment will be added, at cost. Payment by PayPal. Shipment outside EU will of co...

The Oshiro is one of the first macro lenses focusing between infinity and 2x. It came out immediately after the Laowa 60 mm f/2.8 lens and was even advertised with pictures of the Laowa lens, but it is, and looks, slightly different, optically as well as mechanically. I reviewed and tested this spec...

The Laowa is one of the first macro lenses focusing between infinity and 2x. I reviewed and tested this specimen of the Laowa 60 mm https://www.savazzi.net/photography/60mm-2x-lenses.html and https://www.savazzi.net/photography/laowa-oshiro-test.html . Note that these pages describe two lenses, Laow...

The Zhongyi 1x-5x Super Macro is one of few lenses (two, if I remember correctly) with a continuous magnification range of 1x to 5x. This specimen is the revised version of the lens with a smaller front element, after the initial version of the lens with a wider front element was pulled from the mar...

OK, there are several different definitions of contrast, but what most of them have in common is that contrast is defined, and adjusted, relative to some kind of average luminance value. See e.g. https://en.wikipedia.org/wiki/Contrast_(vision) . I think what you are talking about in your example is ...

Yes, it is surprising. I would expect different and lower values for the pictures where the contrast is lower, in your example the bottom pictures. My understanding - maybe this is not the right word - lets say assumption is that this and similar programs are looking for an edge and then count the ...

[...]If you have a 100ws strobe and a 100ws continuous light all things being equal they will give you the same level of subject illumination, so let’s say at iso 100 with the strobe on full power I need F8 to get a correct exposure, shutter at 1/250, now I switch the strobe for a 100w continuous l...

One thing I wonder about software for computing/measuring MTF is that the calculations are designed for optics, but seem to ignore the discrete pixel structure of sensors. The MTF graphs from all software packages I tried so far (not so many, so perhaps not a representative sample) span the MTF rang...

Also a thing that may not be immediately obvious, is that to combine the MTF of different elements in the imaging chain from subject to image, you multiply their MTF. Say for example that you have a lens that gives you 80% MTF at a given lp/mm and a camera that gives you 60% MTF at the same lp/mm. T...

[...]I would like to know what the two levers on the side of the light tube are for ?[...] Yours is complete with most of the illuminator. I never had one like this, but my first guess would be that one of the levers controls a diaphragm of the illuminator to adjust the diameter of the light beam. ...

I am also rather new to making my own MTF tests, so my understanding of MTF software and their results may be wrong in some respects. I don't get paid to do lens tests. They are only for my information. So there are relatively strict limits to what I am willing to pay for test equipment and software...

Like others mentioned, the easiest way is to buy a ready-made short spiral cable from Amazon, which carries at one end a Micro USB plug and at the other end a 2.5 mm stereo jack. For an example search on Amazon "JJC Shutter Release Connector Cable For Sony" but there are also others. Then connect it...

Thanks very much Enrico You know me from the UVP forum. Hi Colin, yes, I recognized your "callsign". This is exactly what I was wanting to know. I have purchased the Epi-Illumination turret & nosepiece for the 1st edition & I am hoping to adapt it to my M42 tube connection to my full frame camera. ...