Author Topic: Nikon 105/2.5 AI-s vs AI: changes between them?  (Read 932 times)

Jedi

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Re: Nikon 105/2.5 AI-s vs AI: changes between them?
« Reply #15 on: April 15, 2019, 05:19:40 »
In case it is not clear from previous responses, the AI and AI-S have the same optical design, so they will render identically.
However the AI has curved aperture blades so the opening is rounder (but not fully rounded), giving background blurs a more organic appearance. The AI-S has straight edge aperture blades so blurs are distinctly polygonal (7-sided).

Both are fully multicoated, using Nikon Integrated Coating (NIC) which is a very good coating. Late production AI-S 105/2.5 lenses with serial no greater than 1043xxx have the newer yellow-green Super Integrated Coating (SIC), but I don't think it makes much difference in practice. If flare or contrast is a problem, shading the front element will make a bigger difference.

My preference is for the AI version due to the rounder aperture and also the longer focus throw. The built-in hood of the AI-S can be of use at times but it is on the short side and tends to be a little wobbly.
Yes, I had understood this.
Nikon D810 - Zeiss 21/2.8, Zeiss 25/2, Zeiss 28/2, Zeiss 35/1.4, Zeiss 50/1.4, Zeiss M-P 50/2, Zeiss Milvus 50/1.4, Zeiss 85/1.4,  Nikon AF-D 85/1.4,  Zeiss 100/2, Nikon AF-D 105/2 DC, Zeiss 135/2, Nikon AF-D 135/2 DC, Nikon AF-D 180/2.8, Nikon AF 300/4

Jedi

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Re: Nikon 105/2.5 AI-s vs AI: changes between them?
« Reply #16 on: April 15, 2019, 05:20:12 »
Thank you all!!
Nikon D810 - Zeiss 21/2.8, Zeiss 25/2, Zeiss 28/2, Zeiss 35/1.4, Zeiss 50/1.4, Zeiss M-P 50/2, Zeiss Milvus 50/1.4, Zeiss 85/1.4,  Nikon AF-D 85/1.4,  Zeiss 100/2, Nikon AF-D 105/2 DC, Zeiss 135/2, Nikon AF-D 135/2 DC, Nikon AF-D 180/2.8, Nikon AF 300/4

richardHaw

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Re: Nikon 105/2.5 AI-s vs AI: changes between them?
« Reply #17 on: April 27, 2019, 15:43:09 »
https://richardhaw.com/2017/05/05/repair-auto-nikkor-p-c-105mm-f2-5/

just updated one of my most popular articles  :o :o :o

JohnBrew

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Re: Nikon 105/2.5 AI-s vs AI: changes between them?
« Reply #18 on: April 30, 2019, 00:00:26 »
get the Sonnar version  :o :o :o

sorry, just my preference...i am a Sonnar lover ::)

the Ai is better-built but no hood
I have a hood on mine. HS-4, which specifically states it is for the 105 2.5, 135 3.5 & 105 4.

Birna Rørslett

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Re: Nikon 105/2.5 AI-s vs AI: changes between them?
« Reply #19 on: April 30, 2019, 07:15:54 »
For my 105/2.5 lenses, I us HN-8, which is a screw-in not snap-on type. The latter always is prone to falling off at the most inconvenient of times.

richardHaw

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Re: Nikon 105/2.5 AI-s vs AI: changes between them?
« Reply #20 on: April 30, 2019, 07:52:37 »
i am sure that i have one of those hoods here somewhere...my house is too messy :o :o :o

MFloyd

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Re: Nikon 105/2.5 AI-s vs AI: changes between them?
« Reply #21 on: April 30, 2019, 20:38:14 »
I have a Nikkor-P 105mm f/2.5 (pre Ai, but retrofitted and chipped). It's a Gauss type one i.e minimal focus distance = 1m, and 7 rounded diaphragm blades. Works perfectly with the D850. Careful: aperture should be dialled in on the lens (non linearity of the aperture dial), otherwise you start to be over-exposed on smaller openings.  ;)



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