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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I guess it’s something with the quality of the glass. Modern lenses are dead sharp and have very little flaring, ghosting, chromatic aberrations and low distortion. They also focus instantly with zero noise.
Say there’s a short Nikon 35mm f2 which has very bad ghosting situation, and it’s resolution is miles behind modern 35mm f1.8 mirrorless.
Read about elements that go in a lens, you’ll get some idea
Isn’t that leica lens for rangefinder?
Just like any form of miniaturization, making smaller lenses requires tighter tolerances to get similar quality. Big lenses gather more light, reduce vignetting, and more easily allow for larger apertures. When you try to make these things smaller, it requires better materials, more difficult manufacturing, and more complicated engineering. Professional lenses of any brand are expensive. Leica lenses are very, very expensive in part due to these challenges.
Did you just compare a manual lens to one with auto focus?
Then Leica is manual focus but the adapter allows it to autofocus.
I also have some vintage 50mm 1.4 the size of a shot glass which are tiny compared to modern 50mm 1.4 lenses which resemble the size of a Saturn V.
I guess the modern glass is correcting for much more optical errors people in the 70s and 80s were accepting but won’t any more today. After all there wasn’t 60 megapixel resolution on 35mm film (no, don’t even start!).
Maybe manufacturers could have corrected these already in the 70s and 80s but the lens would have been ridiculously expensive, or big, or heavy. Or all three.
But but I adore the tiny 2.0 sigma’s…
The Sigma lenses aren’t tiny, though. A Sigma 35 f2 is only 3cm shorter than the Sony 35 1.4 GM, which is a much better lens. 3cm is barely longer than the distance from the tip of my index finger to past the first joint on that finger.
I don’t think I would fit a Sony 35 1.4 on my Lumix though. ;-)
I’m very happy with my two Sigma’s 35mm2.0 and 90mm 2.8 Contemporary. Tack sharp. Build like a tank.
The Leica has 8 elements vs the Nikons 17 (!). Plus Nikon has an AF that moves two groups of elements.
I’m not a lens engineer but I think the modern “big three” primes are just totally over-engineered for crazy edge-to-edge sharpness with very low chromatic aberration, which means LOTS of lens elements. Throw in a silent AF motor and potentially image stabilization too, and you have a Quaker Oatmeal can sized lens.
Not just one AF motor! My Sony 50 1.2 GM has FOUR!
Carlinwasright has your answer!
Another example: The Nikon F 50mm /1.4 AF-D has 7 lenses in 6 groups. Thats 10 lenses less than the Nikon Z. BUT: Even in old times the step from 1.4 to 1.2 was relativily huge, the 1.4 weighs around 260g, the 1.2 around 380g…thats nearly a 50% increase
The modern prime lenses for digital have - in the lab! - much better optical qualities than the old primes like Leica or Zeiss that are around for literly decades. If anybody can see this differences in real life is a complete different discussion.
Yeah, even the Nikon 50mm 1.4D vs the 50mm 1.4G the difference in image quality is night and day. The D is also tiny compared to the G. Unfortunately, it’s a somewhat immutable fact of physics that good quality optics are big and heavy.
My Nikkor 50 f1.2 is many things. Sharp isn’t on the list at f1.2.
lol, I just get them for low light when needed. Otherwise I add filters or literally just finger grease to reduce the quality
Had a good chuckle at “Can of Quaker Oats”.
Yeah. The sharpness in the corners of my nikon Z primes, even when shooting wide open, is seriously impressive.
I’m liking this solely on your reddit handle
The main difference is that the newer lenses compensate for more aspects. Chromatic aberration and corner sharpness being the most obvious ones, but potentially also vignetting (there has also been a trend for new lenses to ignore vignetting with the “fix it in post”-mentality).
I don’t have any experience with the Leica lens, but I’ve got the Canon EF-50mm 1.2 (and 1.4) and both of them are very soft in the corners wide open and they have plenty of chromatic aberrations, which is a consequence of the compact double Gauss optical formula. The Sigma Art 50mm and the RF 50mm 1.2 has a completely different level of corner sharpness and CA.
One major aspect is autofocus and the motor systems needed to shift the large f-stop pieces of glass within the same housing whilst also offering silent motors, weather sealing, electronic control/communication and overall durability.
Historically and technically, primes are very simple designs, but, earlier designs could cut corners due to the formats they were designed for. I.e. b&w, 35mm, etc. These formats were nowhere near as detailed as digital images and so new elements are needed to refine the quality.
They also have a lot of patents taken up. The Leica and Zeiss patents for Summilux and Plannar, etc are very old. So rival designs often needed to take the long route to the same result.
But it all together and you have that behemoth of a Nikkor!
If what you’re saying about patents is true, that’s such garbage. Consumers being punished arbitrarily
That’s just how patents work. And not just for lenses. Any invention can be patented in this way and any rival will need to have a variation in the design, otherwise, they’re infringing on that patent.
Sorry, you misunderstood. I know how patents work! I more meant it’s garbage if it’s true that patents are the reason why they can’t be smaller.
It’s really not. Old patents are expired anyways. Canon can make a knockoff of an old Leica lens (and actually used to, sort of) but what would they do with it in today’s market?
The overall effect of patents is difficult to assess but there’s arguments in both directions.
Patents mean that small niche companies can bring items onto the market safe in the knowledge that larger players won’t just copy them and drive them out of the market
The same goes to companies which just make copycat products (see Amazon today if you want to know what such a world looks like) in countries with cheap manufacturing and labor costs.
Patents mean others are incentived to become creative themselves, thus adding to the total level of innovation present in a market
Don’t forget that patents only last for 20y max, and you can license patents too.
I’ll just add there are great small modern lenses, e.g. Samyang’s tiny lenses for Sony full frame. Not pictured is the 24/1.8 which is a similar size yet similar quality to the Sony GM 24/1.4, other than the aperture, though not all of them are quite to that level optically.
In the old days, we avoided zooms because of all the extra glass needed to do the zoom part. A perfectly good prime lens might have 4-6 pieces of glass in it. A zoom lens a dozen of more (like a modern prime). Every extra piece of glass mattered. I guess it either somehow doesn’t anymore, or the cameras are designed to compensate in away not possible with film. I don’t know and I don’t own any of these monstrosities anyway.
But, the OP’s comparison is not really valid, since you really need to compare the weight (and hypothetical size) of 4 old prime lenses to one modern one to get close to the equivalent glass.
More optical groups for correcting optical aberrations.
Zeiss otus 55mm is massive for a 1.4 lens
It is. I saw prints of images taken with it that were 2 meter high and the amount of details was impressive. The Nikon Z 50mm 1.2 is even more resolving.
And what is the image quality and do they cover the same sensor size?
Why are modern prime lens so big and heavy?
Simple (not really): Every time a photon passes through a medium, like say - glass - that photon gets distorted, at least to some extent. You must now correct for that distortion and you do so by… wait for it… passing it through another medium.
Uh oh. You’ve distorted it in an entirely new and exciting way. Which must now be corrected for. Guess how that’s done?
It’s enough to make an engineer weep.
Read this: https://www.dpreview.com/opinion/9236543269/why-are-modern-50mm-lenses-so-damned-complicated
Simple (not really): Every time a photon passes through a medium, like say - glass - that photon gets distorted, at least to some extent. You must now correct for that distortion and you do so by… wait for it… passing it through another medium.
Uh oh. You’ve distorted it in an entirely new and exciting way. Which must now be corrected for. Guess how that’s done?
So photons just started doing this in recent years?
So photons just started doing this in recent years?
They have always done that.
The less complicated the lens, the less it controls for flaring, aberrations, loss-of-sharpness etc etc.
