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The Everyday Sling might just be the perfect pack for not carrying too much gear, combining comfort with Peak Design's signature modern style.
Last night I tried out my Yashica/Contax-mount SpeedBooster on the Panasonic GX7 with an M42 screwmount lens, the Voigtländer 58mm f/1.4, via an M42-to-Y/C adapter. The lens is branded Tokyo Optical, aka Topcon, and was made by Cosina with Topcon's permission for a short time c. 2004 or so. It's a recomputed version of the original 58mm f/1.4 Auto-Topcor from the early 1960s.
For a quickie test I set up on a tripod and took some pics of an old painting in my rec room. The SpeedBooster converts the Voigt/Topcor into a 41mm f/1.0 lens. Here's the painting at f/1.0, cropped to 16x9 to eliminate the boring background wall. Note that the painting wasn't centered in the frame top-to-bottom...rather I placed it up near the top to get a better read of the lens' corner performance. As it turned out, though, a bit of field curvature combined with the slight forward lean of the painting at the top resulted in sharper corners up top than at the bottom!
Now here's a full-res crop from the bottom right corner of the painting. Resolution & contrast drop away from the central third of the image but it's gradual in both cases.
At f/1.0 overall saturation & contrast are reduced relative to smaller apertures but not by all that much. There's some corner light falloff too but, again, not all that much. At f/1.4 there's very little difference in image quality or in exposure time (1/6th sec. @ f/1.0, 1/5th sec. @ f/1.4)...corner falloff improves marginally and DOF increases. At f/2.0 corner falloff is gone and the image crispens across the frame. At f/2.8 the image is very crisp throughout...stopping down further gets you a very marginal improvment at f/4.0 but only greater DOF from there on down. Just a tiny hint of diffraction softening at f/11. Other pics I took around the house bear this out. Here's the same bottom right corner at f/2.8.
Just for kicks here's an off-the-cuff pic I took while testing the GX7's focus peaking accuracy with the Voigt/Topcor. At close range, one meter in this case, peaking is good enough that there's no need to magnify the image in the EVF. Due to the very shallow DOF at f/1.0 there's an almost 3D quality to this photo...look carefully at the film titles on the Blu-ray cases and you may see it. The films all have something in common too (three of 'em have two things in common)...know what it is?
Once again I'm impressed with what the SpeedBooster does to my lenses!
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|Oct 13, 2013|
|Oct 13, 2013|
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