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Need a good and fast 35mm
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PostPosted: Mon Dec 27, 2010 8:59 pm    Post subject: Reply with quote
peterqd No I did not. Now I do, thank you I was so inattentive.
Orio It looks like very nice deal. Unfortunately I am not ready to buy yet.
all I like that Vivitar 35/1.9 a lot. But Nikon lens looks more optimistic for me. I think I am going to try that AI-s 35/1.4. It is in sane price range for me and It has an excellent bokeh. By the way who could shed a light on how to distinguish AI and AI-s lenses?


PostPosted: Mon Dec 27, 2010 11:32 pm    Post subject: Reply with quote
I have the Zuiko f2, Nikkors f2, f1.4, Rokkor MD f1.8, Canon nFD f2, and like them all ; My favorite is the Nikkor 1.4 AIS ; The nFD is sharper than the Rokkor.


PostPosted: Tue Dec 28, 2010 7:21 am    Post subject: Reply with quote
Arctures wrote:

all I like that Vivitar 35/1.9 a lot. But Nikon lens looks more optimistic for me. I think I am going to try that AI-s 35/1.4. It is in sane price range for me and It has an excellent bokeh. By the way who could shed a light on how to distinguish AI and AI-s lenses?


The easy way to tell the difference between the AI and AIs lenses is the AIs lenses have a semi-circular notch machined into the back of the lens flange. But there's more to their differences than that. Here's a post I made in a recent thread that addresses the differences to a fuller extent:

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I have always thought that the difference between AI and AIs lenses was the semi-circular notch on the back that engaged pretty much only with the FA and N2020, and that all this did was engage a program shift function. Turns out there's quite a bit more to it than that. I did a bit of googling and found this post from 2005 over at photo.net that goes into good detail:

Roland Vink , Jul 20, 2005; 09:57 p.m.

"Which camera do you have? As far as I know only the FA and N2020/F501 make use of the AiS features, other cameras including F3, FE and FM series treat Ai and AiS as the same."

Technically the main difference is that there is a liniear relationship between the movement of the stop-down tab at the rear of the lens and the aperture opening. Moving the tab a known amount stops the lens to a known aperture - required for accurate exposures in shutter priority and program modes. Ai and earlier lenses don't have this. However most cameras don't offer shutter or program modes with manual lenses so the feature is somewhat redundant.

A couple of cameras (EM?, FG?) do offer these modes even with Ai lenses - they set the tab to the "correct" position, then take a stop-down reading and adjust the shutter speed if necessary.

The linear stop-down is important if you have your lens "chipped" to allow metering with AF cameras. These cameras will work in program and shutter priority with CPU lenses, but the assumption is that it has a linear stop-down aperture.

A minor difference is that AiS lenses will automatically trigger high speed program mode with the FA and F501 if the focal length is 135mm or longer.

Optically, most Ai and AiS lenses are the same - same glass, same NIC coatings. The notable difference is the 28/2.8, the AiS version has CRC and is a much better lens. Very recent AiS lenses have the newer SIC coating.

AiS lenses tend to have a shorter focus movement - this allows for quicker focusing at the expense of precision.

. . . . . .

Here's the whole link:

http://photo.net/nikon-camera-forum/00Cwhh

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And here's the thread the above post came from:

http://forum.mflenses.com/posting,mode,editpost,p,1096780.html
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