this post was submitted on 29 Nov 2023
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Why are modern prime lens so big and heavy? (alien.top)
submitted 11 months ago by [email protected] to c/[email protected]
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For example the Nikon Z 50mm f1.2 is 1090 grams, 150mm long, and has a 82mm filter size. The Canon RF 50mm f1.2 is 108mm long, but the other dimensions are similar.

Compare that to a Leica Noctilux 50mm f1.2 with a Techart, Megadap or similar adapter (available for Z and E mounts) for autofocus abilities: 405g lens +150g adapter = 655 grams, 52mm lens + ~11mm adapter = 63mm long and 49mm filter size. A little more than half the numbers in all dimensions.

This link approximately shows the size differece (the M to L mount is indeed smaller than the M to Z or M to E autofocus adapters, but the difference is small)

All of these have the same focal length (50mm), max aperture (1.2), and autofocus. So why do these newer mirrorless lens designs have to be so much bigger and heavier than using an old manual lens with an autofocus adapter? Sure the autofocus speed may not be as fast with an adapter but why can't they design a native autofocus large aperture lens that is tiny like the Leica M lenses. Clearly it is possible to do so.

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[–] [email protected] 1 points 11 months ago

Thanks for the detailed breakdown. Those are points clearly could only have been noticed by someone who experiences both the Leica rangefinder and regular modern day mirrorless.

Like many, I definitely felt drawn to the mystique of Leica, but your comment may have squashed that bug, at least for now. I just wonder how Leica M users would respond. If you're brave enough you should post these criticisms in their sub reddit lol.