Thomas Herter

Thomas Herter

Santa Clara, California

50 years of hobby photography for my private use, family and friends. Includes aerial and sailing photography. Using both a Nikon and a Canon system, also a Lumix/Leica as a pocketable solution.

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  • Thomas Herter
    Thomas Herter
    Participant
    Posts: 2
    Papers & Media
    on: August 17, 2019 at 10:02 am

    Once you know, its easy, but at first the guesswork starts:  What in heavens is “gsm”? And how much is 20mil? What is a ‘mil’ anyway?

    A google/bing search shows ‘Global System for Mobile Communications.’ Hm, no, apparently not that GSM is meant here. But I see a search topic “is gsm 2g or 3g”, looks promising.  Maybe this is a flex weight of 2-3 grams?  No! Its the topis “is GSM a 2nd or 3rd generation.”  But on the very bottom of the page I see a search topic “gsm paper”: Gotcha!  Its g/m^2, gram per square meter. Ok, so we are in the SI unit territory here, but with a trade common designation.  In SI ‘gsm’ means literally “gram second meter” and is kind of a nonsense.

    Now the ‘mil’ is however apparently 1/1000 of an inch, a non SI unit of measure. Punch in “what is 20mil in mm” and apparently thousands of people do that. Its 0.508mm.  Divide mil by 39.37 to obtain millimeter.

    Thus the paper thickness is approx 0.5mm, now finally I can picture it. Its thick!

    Paper is not alone in this issue of confusing measures. We have a similar goulash of units in the photography on every step: focal length is in mm, but the monitor sizes are in inch-diagonal. Sensor sizes are even worse, its kind of approximately 1.5 * diagonal in inches, the infamous 4/3rd inch comes to mind…  Unless consumer laws will require to show on the package standard measures, equal to all, we have to live with it.  Imagine how helpless one would be without the web search !

    Thomas Herter
    Thomas Herter
    Participant
    Posts: 2
    Re: Welcome From Kevin
    Reply #1 on: August 10, 2019 at 2:08 am

    I am happy to see you back online and full of energy.  I think that out of reverence, and in a full defiance you should put up here a page “Me and Michael Reichmann, years of friendship and collaboration.”  Let the guys at the (as you say it) “other web page” bite it.  I red ‘his’ and your articles for years.  They were interesting, educational and they shaped my skill in this hobby.  Than for me photography is ‘only’ a modest and yet passionate hobby.  I value a gentle kind of dealing with each other, and the way how it turned out at the other web side is not “my cup of tea,” to coin a phrase by Michael Reichmann from one of his articles.  Good luck, and I hope hear from you soon.  Here and on the Youtube.