Author Topic: Nikon 105/2.5 AI-s vs AI: changes between them?  (Read 404 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, Nikon 28/2 AI, 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, Nikon 28/2 AI, 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