Author Topic: Choosing between 10.5/2.5 and 135/2.8 Q  (Read 1376 times)

MEPER

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Re: Choosing between 10.5/2.5 and 135/2.8 Q
« Reply #30 on: January 05, 2021, 22:42:16 »
I wonder why Nikon decided to go back to 6-blade aperture?
I have no. 197838 and it has 6-blades. It is a quite heavy lens. A lot of glass in it.

Petr sheepeck Jůza

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Re: Choosing between 10.5/2.5 and 135/2.8 Q
« Reply #31 on: January 05, 2021, 23:25:56 »
I remember reading at Richard Haw’s site that manufacturing these lenses with 9 blades was too difficult hence this simplification.

Now few mentioned photos:

Roland Vink

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Re: Choosing between 10.5/2.5 and 135/2.8 Q
« Reply #32 on: January 05, 2021, 23:48:51 »
In the early days Nikon made photographic lenses for rangefinder cameras. With these lenses the aperture is always at the shooting aperture, the aperture blades don't need to open and close quickly so can be robust and heavy, with lots of blades to make a nice circular opening, and it does not matter too much if they are bit sticky due to dirt and oil.

Very early SLR lenses also had many aperture blades. But with SLR lenses the blades must close and reopen very quickly when the picture is taken, so they must be very thin, light and clean. The early lenses were very delicate and fiddly to assemble. The high number of blades also have more friction than apertures with a lower blade count, and may have not have been quick enough at high shutter speeds. Whatever the reason, Nikon decided reduce the number of blades to 6 for most lenses (5 for the Nikkor-H 28/3.5). During the mid 1960s a number of lenses were introduced or upgraded to have 7 blades, which gives blurs a nicer shape and in my opinion is a better compromise between ease of assembly and attractive bokeh.

Petr sheepeck Jůza

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Re: Choosing between 10.5/2.5 and 135/2.8 Q
« Reply #33 on: January 05, 2021, 23:58:23 »
Oh, that’s the reason.
Thank you for the explanation.