At what focal length does the circular distortion stop?
643480
This lens has a fish eye perspective at all focal lengths, but it is most pronounced at the wider focal lengths (between 10 and 15mm). At 16/17mm, the fish eye is not particularly prominent and if you are not taking photos of architecture, you might not notice it as much. If there are a lot of straight lines in your photo, you will notice that they curve, at least a little bit, at all focal lengths.Hope that helps.
643481
Distortion is more prominent in the camera-object distance. minimum distortion beyond 12 feet
452516
If you want 1/2 to life size extreme close-up capability this is not the lens. The focus ring scales indicate focusing upon a subject as close as .82 ft. At the 18mm setting that will capture a horizontal field of view of about 8 inches wide with the lens about 4 to 5 inches from the subject. At 55mm the horizontal field of view is about 5 inches wide with the lens about 8 or 9 inches from the subject.
342852
Overall I am delighted with the image quality of this lens. I'd prefer to use the 24mm setting to minimize distortion in a group of people (if conditions permit). I use it mainly as a landscape lens and still use it extensively.
982896
I also should point out that FF lenses when used on crop-sensor cameras, such as yours, behave as a longer lens. By the tune of 1.6x so this lens when on your camera would be the equivalent of an 28-216. It's like you have a longer lens. There are some good points to that, one is that since the edges are cropped off and that's where the most lens distortion occurs you'll get a clearer, sharper pic.
1694217
It appears the focal distance is about 10-12 feet; you will be unable to see any clear image nearer than that distance.
525547
I haven't used this lens in years but from memory I would say about 4-5 inches un-extended and about 7 inches zoomed out.
462296
Maybe due to focal length they are classifying it as fixed zoom but I would disregard. Focal length is equivalent to 45mm on FX.
2217647
The focal length is only 35 max, you don't need IS at this point. The further the focal length goes, the more you need IS. Don't worry.
1534406
The lens is an autofocus, I don't understand you about "rectangular fisheye" If you are asking about the circular aberration, the lens has aberration.
313887
not 180, but pretty darn close. I love this lens. Perfect for fitting in large landscapes..
1871573
From Sony's RX1 specifications page:Focal Distance : AF approx. 24cm to infinity (Normal mode), approx. 14cm to 29cm (Macro mode)So in macro mode, you can focus anywhere from roughly 5.5 inches to 11.4 inches. Good enough for most bugs, flowers and jewelry I would imagine.
616945
I haven't noticed any. Since its pretty good quality glass the direct view is distortion free for the whole lens. When I got this question I started playing with it and found no real distortion looking through at a angles up to 30 degrees and past the edge of the lens.
108097
This represents approximately 1/2 stop of light. That may not sound like much but in low light it can make a difference. Also, Nikon doesn't make a 24mm 1.8. the closest is a 28mm 1.8 which is obviously a different focal length. It is a very good lens however. If you don't need the 1.4 and 28mm is an acceptable focal length then go for that as it is much cheaper.
1140706
The f-stop is dependent on the lens not the camera. Additionally, on a zoom lens the f-stop will change as the focal length changes. The SMC Pentax DAL 18-55mm zoom has a maximum f-stop of 3.5 decreasing to 5.6 for maximum zoom.
2217648
IS will not matter at this focal distance. Only start worrying about IS (or VR as Nikon refers to the technology) past about 70mm
920674
Somewhere around the 4 mark. It's such a great lens. I don't think you'll regret purchasing it, truly.
713256
What I discovered accidentally is that the bezel on this camera can be turned to change the focal length, so a slight adjustment will give you clean HD even just a couple of inches from the lens if that is what you need. You'll have a fish-eye distortion, but it will be in focus.