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Gary, the weather here has been fabulous this week, low 20s, not much humidity, clear sky every day! Most of those images were done at f/8. Whenever I shoot this stuff, I stop down a fair amount, especially with longer lenses like the 90 because depth of field is not as great as one might expect. The 90 Summarit is quite good. I haven't shot any of the other Leica 90s, so not sure how it compares technically, especially to the 90/2.8s. I've tried the 75 Summarit and think it was slightly sharper. Size-wise it's great. The last 50mm was probably around 5.6. I also try to keep the shutter speed at or over 1/250 with the longer lenses. As the sun set and the light dropped, it was not possible to hold both settings for ISO 160 so dropped the shutter speed somewhat, and did notice some images that weren't as sharp as they could be.
Michael - the 50 Lux is great at f/2.8, retaining a nice smooth background. Regarding my first set at the top: you're not imagining things. It's 1960 vs. 2010 lens technology. While you can somewhat see it at 1000 pixels, at full rez, the opposite shoreline is sharp from edge to edge in the SEM file with lots of detail in the trees. The Canon is only sharp in the very center, but even stopped down, it never matches the 'brilliance' of modern Leica and ZM lenses. I did some informal test of it against the ZM35/2.8, and the Zeiss has the edge in overall and micro contrast, as well as color fidelity and saturation. But on its own, the Canon is still very fine. What I see from it is a quality that reminds me of film images from the 70s. Colors are not over the top, but balanced, if slightly on the cool side, which affects the impression of saturation. That's why I suggested it doesn't really fit in easily with my modern kit if I'm looking for higher technical performance, such as the architecture series above. It's included in one image, which feels slightly murky in comparison to the others, though all of those images have had a lot of contrast adjustment. And a few more from it below...
Canon 35/2 LTM:
Leica Tele-Elmar 135/4 (on loan):
And one from the 21SEM that doesn't really fit in anywhere in the series