Product test
How good is photographic equipment under 1,000 francs/euros?
by David Lee
Three 50 mm lenses from Sony in comparison
14.4.2022
Translation: machine translated
All three lenses are handy, reasonably fast and have a 50-millimeter focal length. And yet they are very different.
Lenses with a focal length of 50 millimeters are the most normal thing in the world - that's why they are called normal lenses. They show a section of the image that is similar to the human field of view and are therefore versatile. This focal length enables fast and sharp lenses without complex lens construction. That's why a classic "nifty fifty" is small, light and inexpensive despite its high speed.
For me, a 50 mm lens is always part of the equipment. However, there is not just one per system. Sony has about half a dozen on offer, plus others from third-party manufacturers.
The lenses
I will compare three lenses in this article. First of all, there's the FE 50mm F1.8, which I'll call "f/1.8" from now on. It corresponds most closely to the classic Nifty Fifty: quite fast, weighing only 186 grams and actually very cheap. At the beginning of the year, it was still available for under 200 francs. In recent months, however, supply bottlenecks have driven the price up.
The third 50 mm lens is the most expensive of the bunch. It is neither particularly fast nor macro-capable, but it has other advantages. The autofocus is fast and quiet. This lens has an aperture ring that can also be adjusted continuously. This makes it more suitable for video recording than the other two. As an aside, it is also the smallest of the three lenses. I'll call it the "f/2.5" or "G lens" for short in this review.
Operation
The macro lens is more comfortable. Next to the AF/MF switch, there is a customizable button. Unlike the custom buttons on the camera, you can easily hit this button even when looking through the viewfinder.
Focusing
The focus motor on the cheapest lens is slow and noisy. It is hardly usable for videos. Especially annoying: When you move the ring in manual focus, it drives the electric focus motor. As a result, the manual focus is just as loud as the autofocus. In addition, the image section changes significantly depending on the focus point. This focus breathing is also a problem, especially in videos.
The focus shows why the smallest of the three costs the most. The autofocus works completely silently in video mode. The autofocus is also superior in photo mode: It is much faster and still works reliably in low light. The focus ring always covers the same distance, regardless of speed. However, focus breathing can also be seen here.
Here is a comparison of the focus motors of the lenses. Turn on the sound for this.
Macro capability
When it comes to macros, logically the macro lens wins - by far. The question is, who takes second place? It's the f/2.5. It lets me get ten centimeters closer than the f/1.8, and you can see that clearly.
Edge sharpness
In the center of the image, all lenses are sharp, stopped down anyway. But at open aperture, differences show up in the corners of the image. The f/1.8 is clearly less sharp than the other two, even when I stop down to f/2.8. The expensive G lens wins out over the macro, but both are very good.
The comparison images show a crop from the top right corner.
Vignetting
In this comparison, the cheapest lens wins when I shoot all the photos at f/2.8. The G lens is better than the macro, but still disappointing for the price.
However, f/2.8 is already more than one stop stopped down on the winner - and stopping down always helps against vignetting. In this respect, the comparison is not entirely fair. At open aperture, even the f/1.8 remains dark in the corners.
Luminous intensity and depth of field
The three lenses have different apertures: from f/1.8 to f/2.5 to f/2.8. What does that mean in everyday use?
In a situation where a lens with f/1.8 speed can get by with 1000 ISO, one with f/2.5 already needs 2000 ISO and one with f/2.8 2500 ISO. This can sometimes be an advantage, but most of the time f/2.8 will do.
The other advantage of a larger open aperture: More latitude when it comes to blurring the background. For the following three self-portraits, I would recommend you to focus only on the background. It's much less sharp at f/1.8.
However, I think that in such cases the image composition is much more important than a bit more or less depth of field. Specifically: The distance between the subject and the background is the most important factor. If this is large enough, portraits can be made that are clearly set off from the background even with f/2.8.
Conclusion
For videos with autofocus, only the f/2.5 comes into question. The others can only be used for videos in situations where the focus can be fixed in advance.
In photo, the matter is less clear. All three have their advantages and disadvantages. Nevertheless, I clearly favor the f/2.5 here as well. Despite its small dimensions, it offers very good image quality and leaves hardly anything to be desired in terms of handling - quite in contrast to the f/1.8, which doesn't even have a focus switch. The excellent focus motor of the G lens is also welcome when taking pictures.
As for the macro: The compromises you have to make for the macro function would be too high for me. Budget permitting, I'd recommend a separate macro, ideally with a bit more focal length. Sony's 90 is a very good macro lens.
The f/1.8 is really only a good choice because of the normally low price and the speed. Whereas I find that in full format and with today's low-noise sensors, even f/2.8 is almost always sufficient.
Ultimately, lens and camera should fit together. If you bought an Alpha 7 II at a low price to shoot portraits, the f/1.8 may be the right choice for you. However, you can only exploit the potential of a current Alpha 7 IV with fast autofocus and sophisticated video functions with the f/2.5.
David Lee
Senior Editor
David.Lee@digitecgalaxus.chMy interest in IT and writing landed me in tech journalism early on (2000). I want to know how we can use technology without being used. Outside of the office, I’m a keen musician who makes up for lacking talent with excessive enthusiasm.
