Re: Nikon Objective 2x/0.05 with Iris Diaphragm

Dear Group,

Of the various explanations given in response to my original question
regarding the function of an iris diaphragm on a Nikon Objective of
2x/0.05 I think that of Ron is the best.

I looked into various old Nikon literature and I did find mention of
a "low-power condenser with a numerical aperture of 0.32 for use
with low power macro-objectives, e.g. 1.2x, 2x and 3x plan achromats".

Thank you for your answers

G.R.


"Ron Wickett" <rwickett@xxxxxxxxxxxxx> wrote in message
news:umMfg.44954$Lm5.23456@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
There was a 1.2x, 2 and 3x and a special low power condenser to fill the
large field that had no diaphragm ,so the objective diaphragm was most
likely primarily for contrast control.
"NoSpam" <NoSpam@xxxxxxxxxxx> wrote in message
news:0P6fg.12543$U_2.6913@xxxxxxxxxxx
Hallo,

I own a Nikon objective 2x/0.05 for a 160 mm tube with a long working
distance.
The objective also has an iris diaphragm.

Can anybody tell me the purpose of the diaphragm?

Thank you

G. R.






.

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