Can I catch Confirmation Virus from a Old Leica Lens?

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There are entire forums where these issues are debated. 
 

my 2p:

 

Pre-digital, I used Leica M for wide-normal and Canon for tele. The rangefinder works great for wide. AF works great for tele/sports.

 

The M6 with the old lux 35/1.4 was very very compact — easy to walk around all day. In contrast, the new 35s with AF etc are gigantic! It’s an ergonomics issue. 
 

In contrast the R line never really did it for me. My Canon 200/1.8 is an exceptional portrait lens that doubles as a high speed indoor sports lens.

 

All these lenses work great on my Sony A7r3 w adapters 😉 Still can’t beat the ergonomics of the M6.

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10 hours ago, gmgraves said:

When you get to the point that you always decide to not take your camera gear along with you when you go out because you don’t want to lug it around, then that’s when these SLR-like non-interchangeable lens digital cameras start looking really attractive. I can shoot stills, H-D video and have every focal length from ultra wide angle to super telephoto at the touch of a button!

Yes! Again, my prior use of the Leica M was precisely because I found myself not lugging (sic 😂) around the SLR.

 

I totally agree that these little cameras allow you to capture the shots that lack of camera would miss!!! That said the iPhone is also serving a similar need.

 

For me the Sony A7 (or similar mirrorless) hits a sweet spot for full frame, (and adapts to all my old lenses) and smaller sensor ultra zoom fills in quite nicely.

 

Many times it’s not the ultimate lens quality but fact that you have a camera there! Interestingly there are iPhone apps that add bokeh, and reduce the depth of field/mimic low f stop. 

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18 hours ago, Ralf11 said:

 

but do they seem "analog" like the old Leica Glow lenses??

The main problem, in my own experience, is not lack of sharpness, rather the typically long depth of field (high f-stop) so everything is in focus. Typically the larger the sensor (large format film included) the more shallow the depth of field. The “glow” can be the background.