Around here, temp.s can hit minus 25F. I've used those handwarmer/footwarmer packets. Some older mechanical cameras need to be "cold hardened" with special lubricants, (although just cleaning & applying modern lubricants helps a lot) it's simpler and kinder to the camera to keep it warm, also...
"Pixel peeping" Yes.
My preference for sharpness across the frame is the double Gauss type, however the Sonnar type has a lot of appeal. The j-8 and j9 are really nice, also a 30s uncoated Zeiss Sonnar. The Summitar has some of the same smooth contrast as the Sonnars. And since the OP has an...
One thing about the Summitar - it's no lightweight, weighing about 210gm. I love mine, but I got lucky. Mine has perfect glass, but came with the front cemented pair about 40% separated. Fortunately I could repair that, so I got very lucky to find the lens, the dedicated lens cap, the SOOPD...
Caretakers, yes, however only for certain items which are inherently durable enough to respond well to care and maintenance - lots of stuff isn't. An F2 is designed with regular maintenance in mind, so is a Leica. So are lots of other things, watches, clocks, automobiles, etc..
Sover Wong does...
The Soviet finder for that lens (forget the designation, it's an ugly plasticky thing) is actually pretty good. A good J12 is pretty nice. Just watch for sun in or just outside the frame, those things can flare impressively. Keep that in mind and they're very nice.
Which reminds me, I keep forgetting to order an ink sac for a mid-20s lever-fill Sheaffer "Lifetime". Anyone needs one, it's Pen Sac Co dot com. They're cheap, $2-3 each. Shipping $4 iirc.
And the 105/2.5 Sonnar is pretty damn nice too.
My 35/2 Nikkor-O came free, a friend sent it to Nikon for repair, Nikon had stopped servicing pre-AI lenses by then, maybe '92 or '3. The aperture was jammed by a floating screw, took me maybe 25 minutes to repair. The lens shows ~20 years of pro...
Excellent choice, as long as it's a good one to start with, you'll have it for a very long time. The Nikkor H/ HC is absolutely first-rate, I have one for each of 5 bodies - a couple came free and the most expensive one, an HC, was thirty-something with shipping. Also, I used my '68 F...
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