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I currently own no modern auto-focus lenses. All of my lenses are film-era, manual-focus, primes from the last century. While I can afford the latest and greatest auto focus lenses, I still prefer to shoot manual-focus lenses. I'm an old guy who grew up manual focusing. Heck, I used to shoot birds in flight with manual focusing lenses.
I prefer the build, tactile feedback when focusing, the ruggedness, the bokeh, and the overall rendering of older manual-focus prime lenses. Also, it doesn't hurt that many fine old manual focus lenses are inexpensive. I use live-view with a 3X Zacuto viewfinder and actually nail focus with my manual focus lenses more often than I did when I had auto-focus lenses.
I have way too many 2005 - 2012 era digital camera bodies and was thinking of giving some of them with a few of my lesser used manual focus lenses to my grand-kids. They all have smartphones and sometimes use their built-in smartphone cameras.
I'm searching for something to tell them that would motivate them to want to give a real camera with a manual focus lens a serious try. While many real cameras have huge megapixels, the bodies I'm giving them will have only 10 - 14 megapixels (comparable to the resolution of their phones) - so increased resolution from a real camera isn't an incentive. Their smartphones can produce pseudo out of focus blurs, so I don't expect they'd get very excited about using fast manual focus lenses on a real camera to produce nice bokeh. Their smartphones are lighter, always with them, and smartphone photos can be immediately posted to the Internet without wasting time with post processing (these young people don't even have access to a laptop or a desktop computer).
So, why do you think a newer photographer would want to give a real camera with a manual focus lens a try? What short "elevator speech" would you tell a young smartphone generation person that might get them to give a real camera and manual focus lens a try?
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