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This is complete speculation on my part, but doesn't plastic tend to deform more than metal in harsh temperatures? Won't the lack of a metal frame to precisely
by jasonjayr 5y ago
This is complete speculation on my part, but doesn't plastic tend to deform more than metal in harsh temperatures? Won't the lack of a metal frame to precisely position all the optical elements cause more aberrations over time?
- blagie 5y agoOver temperature? Nope. Or to be precise, not well-engineered plastics. There are a ton of games one can play. For example, one can mix something which expands by 1%, with something which contracts by 1% (which can also mean expanding in the opposite direction). Modern lenses do very well across temperatures. Over time? At least based on what I've seen, older plastic lenses have not aged well. Of course, that means more sold products. A new lens will blow away an older lens if the older ones is plastic and slightly wobbly. Planned obsolescence.
- deleted 5y ago[deleted]
- sudosysgen 5y agoNot at all. This is actually part of why telephoto lenses use a lot of plastic, you can get a plastic to have ~0 thermal expansion, but that's impossible for a metal, meaning better IQ.