Today’s episode: the Sun Actinon 28-80mm f2.8 zoom.
A little background info: Sun optical was a Japanese company that started back in the 1930s and made some pretty good lenses, sometimes sold under ‘house brands’ of retailers. From what I have read the Sun Actinon is not associated with this company, but rather is a ‘house brand’ itself used by a British photographic retailer called Image. Who actually made it is anybody’s guess. Amazingly, for all the information available on the Internet these days there are still vast quantities missing – and at least an equal amount that’s inaccurate.
Oh how I would like to love this lens! It has so much going for it. First of all it has a good focal length range for a 35mm camera: from wide angle to short telephoto. It has a fairly fast maximum aperture of 2.8 (4.5 at tele) as well. Also a built-in macro focus. It’s compact, fairly light yet with a sturdy feel, and the controls work nicely although the focus ring has a slight slop to it and the zoom ring needs the grip re-glued, but both those problems are from use not design.
This is an automatic-only lens, meaning it won’t fully work on the Canon because the adaptor I have for that camera doesn’t push in the aperture pin to stop it down. Works fine on the Sony though. So let’s see what we get:
Not bad. Good colour and contrast, no sign of chromatic aberration, and you can see the recurring dirt on the sensor quite clearly. Let’s look again:
What the hell happened? If you can force your eye to look at the center you’ll see it’s in focus. The difference between the two photos is that the first is at f16 and the second at f2.8. It is normal for sharpness to fall off towards the edges. All lenses have this issue: it’s a function of the physics of focusing light. Usually a lens will have an aperture where it is at its peak sharpness edge to edge. (If you look at the first image again you will see it too has a slight blurriness on the edges.) But this is the absolute worst example of edge fall-off I have ever seen on a modern lens! It made me check to see if I’d somehow missed a pound of lard smeared on it or some other blatantly obvious problem that could cause the effect. The failure continued in every photo I took, no matter what aperture, focal length, or distance was used: obvious low-resolution around the edges persisted.
Which is quite a shame because, well look what it can do in the center:
That’s pretty darn good. Why then does it blur to oblivion around the edges? I don’t know specifically, but a lens so bad should never have made it off the assembly line.
Distant, full focal length, middle aperture – and still the edges are badly blurred.
Hey, see all those spots? You can go crazy trying to keep a mirrorless camera’s sensor clean. Especially when you keep changing lenses. Or take one off repeatedly to look for dirt or grease on it. And no it was not the sensor dirt causing the problem: I switched to other lenses while doing this just to be sure the camera wasn’t in some way the source of the trouble.
Over and over I tried and over and over I cried. This lens had so much potential, and all hopes were dashed because it could not deliver a decent picture under any circumstances. I prefer the consistent low resolution of the Opticam and Cunor lenses to this center-only-sharp, edge-all-blurred disaster.
Lens rating: poor. I can’t even give it a “fair” label because I could not find any circumstances under which it would render an acceptable image. (Cropping out a small center section of the full frame of every image is not reasonable.)