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Archives of an email list on the history of binoculars. - page 85 / 150





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Subject: CD

From: "OPTICKS" <barrymat@___ico.ca>

  I have been compiling your binocular lists for almost a year and have them on a CD. If anyone would like a copy they are most welcome. I would mail it to them for the price of the CD and postage.  Your lists as always provide a wonderful resource and look forward to each new list.


Barry L. Matthews (Opticks)

Tel. (613) 829-5251

Fax (978) 477-2654

E-Mail barrymat@___ico.ca


Subject: Zeiss Dekaris

From: jdamodels@___m

  John Anderson again. I just received a Zeiss Dekaris that you might want to know about. It is serial number 1414935. According to the tables from your website that places it in the range for 1927. The dilemma is that your Zeiss binocular table list production of the Dekaris as beginning in 1929. I know there are a number of people trying to get the serial number/year or production facts straightened out. If you know of any of these folks this might be useful to them. Thanks for all of your help.

Regards, John Anderson


From: Kennyj2@___m

Subject: Re - Exit pupil query

I would like to express my thanks to Rafael and to Dick ( who e -mailed privately) for responding to my query.

Whilst understanding the points Rafael describes I doubt whether Diffraction Limited theory even comes into play at such relatively small magnifications.

I remain convinced that some other factor(s) is ( are ) at work in my examples and from reading as much as can be found on the subject have concluded that this is probably related to the fact that human eye and / or brain acts in far more complex ways than does any kind of lens or lens system.

Thus when the human entry pupil is the limiting factor I do not believe it has  EXACTLY

the same effect in all cases as a simple exit -pupil from an optical system.

Interestingly there are still MANY "experts" who insist that a larger objective will provide increased resolution and "reach" even in daylight with a magnification producing exit pupils larger than the "average" eye pupil dilation .

One of those great little "debates" that I presume will continue for years to come !

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