mawz wrote: chambeshi wrote: mawz wrote: chambeshi wrote:
Do not underestimate the 28 f2.8AIS, which has a revised optical design over the Auto and then AI models
Be careful, there are two different 28/2.8 AI-S designs and you only want the later one with the 0.2m close focus.
The first production batch of 28/2.8 AI-S had the AI optical formula and shares the mediocre performance of that lens.
The two versions can be readily distinguished by the minimum focus distance, as it's 0.3m on the older design and 0.2m on the newer and better version.
According to Roland Vink's site, it was the early 28 f2AI that was upgraded (slightly) to AIS, and all K, AI, AIS versions have CRC and 1:7.1, but the AIS is 1:5.4 and slightly closer focus.
Compared to the 28 f2.8AI the 28 f2.8AIS is a different optic entirely: 2 extra elements and CRC, and 1:3.9 ratio, MFD of 0.2m, and slightly shorter focus throw. Over 200 000 were made, and Serial # changed in 2006 starting at 900001
I've actually had the earlier 28/2.8 AI-S with 0.3m MFD. If you notice there's a serial gap between the last AI and the first AI-S it fits in there. It's actually quite uncommon, but is out there and I got burned (and it was definitely AI-S, with the telltale orange small minimum aperture on the ring). It's literally the last AI version with the AI-S mount hardware.
If I still had it, I'd send Roland Vink the serial to update.
Bugger - sorry you got burnt. AIS also has the half-circular notch milled into the lens mount for coupling with the FA (released 1983). One hypothesis is the aperture ring had been changed/cannibalized off another AIS lens, and fitted it to a 28 f2.8AI. There's no mention of this quirk (ie different MFDs of the AIS version) in the 1001 Nights history: https://imaging.nikon.com/history/story/0057/index.htm
mawz wrote: chambeshi wrote: mawz wrote: chambeshi wrote:
Do not underestimate the 28 f2.8AIS, which has a revised optical design over the Auto and then AI models
Be careful, there are two different 28/2.8 AI-S designs and you only want the later one with the 0.2m close focus.
The first production batch of 28/2.8 AI-S had the AI optical formula and shares the mediocre performance of that lens.
The two versions can be readily distinguished by the minimum focus distance, as it's 0.3m on the older design and 0.2m on the newer and better version.
According to Roland Vink's site, it was the early 28 f2AI that was upgraded (slightly) to AIS, and all K, AI, AIS versions have CRC and 1:7.1, but the AIS is 1:5.4 and slightly closer focus.
Compared to the 28 f2.8AI the 28 f2.8AIS is a different optic entirely: 2 extra elements and CRC, and 1:3.9 ratio, MFD of 0.2m, and slightly shorter focus throw. Over 200 000 were made, and Serial # changed in 2006 starting at 900001
I've actually had the earlier 28/2.8 AI-S with 0.3m MFD. If you notice there's a serial gap between the last AI and the first AI-S it fits in there. It's actually quite uncommon, but is out there and I got burned (and it was definitely AI-S, with the telltale orange small minimum aperture on the ring). It's literally the last AI version with the AI-S mount hardware.
If I still had it, I'd send Roland Vink the serial to update.
Bugger - sorry you got burnt. AIS also has the half-circular notch milled into the lens mount for coupling with the FA (released 1983). One hypothesis is the aperture ring had been changed/cannibalized off another AIS lens, and fitted it to a 28 f2.8AI. There's no mention of this quirk in the 1001 Nights history: https://imaging.nikon.com/history/story/0057/index.htm
