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    Re: FYI Uschold Q&A thread on bjp

    From my personal experience:

    "Sorry, I am too tired to talk with you. My boy got his first teeth for the last ten nights."

    Anders
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    FYI Uschold Q&A thread on bjp

    Hello everybody!

    According to the pleasant experience here, I proposed to
    the British Journal of Photography, London, to host a thread on their forum. It has been announced in their recent issue...
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    Sticky: Re: Anders Uschold Q&A,on zooms versus single FL lenses

    welcome to the club :-))


    Anders
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    Sticky: Re: Anders Uschold Q&A

    Hi,

    I have used the 4/3-OM adapter. The macro lenses 20mm, 38mm and 80mm worked very fine. Some telephoto lenses showed reasonable results. I haven't gone further.

    I didn't know, there would be...
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    Sticky: Re: Anders Uschold Q&A

    Hello Ian,

    good to hear from you again!

    To speak frankly: The US border procedure for journalists is an insult to individual rights and a torture I am not willing to pass. Flight on your own...
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    Sticky: Re: Anders Uschold Q&A,on zooms versus single FL lenses

    Hello Gerry,

    ad1):

    Lens quality is always a matter of price. To be honest, lenses and cameras have never been that cheap and mechanically poor, as they were in the end of the last century. One...
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    Sticky: Re: Anders Uschold Q&A

    Hello Mark,

    first, most manufacturers do store various information in the lens' CPU and hand it over to the body:

    - individual calibration of the diphragm defect. According to mechanical...
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    Sticky: Re: Anders Uschold Q&A

    The sine/cosine condition is elementary know-how of every opto-semiconductor or photovoltaic specialist. I know this from internal discussion with specialists like this. A reasonable part of...
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    Sticky: Re: Anders Uschold Q&A

    Resolution is, as I mentioned yet, not a fixed but a multi dimensional unit.

    Usually sepcialist reduce resolution to two dimensions or aspects: discrimination of structures or spatial frequency,...
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    Sticky: Re: Anders Uschold Q&A

    >Hi again Anders,
    >
    >since this thread still is open, I venture one more question for you:
    >
    >There have been (and still is) a huge controversy about if the Zuiko Digital lenses are worth the...
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    Sticky: Re: Anders Uschold Q&A

    Thanks Hacker,

    well, that is a new word for long existing and well known aspect - the MTF. The modulation tranfer function decribes the relation between spatial frequency of structures and the...
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    Sticky: Re: Reality vs. EXIF

    Alex,

    we do not do shutter tests with digital cameras. With analogue ones it was possible and very precise, but due to the more difficult battery handling of digitals, it refrained from it.

    We...
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    Sticky: Re: Reality vs. EXIF

    No, I explained it wrong. If a camera notes 1/1000 it should be 1/1000.

    But if you measure with your external light meter an aperture - speed - combination for ISO 100 and set it to your film...
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    Sticky: Re: Reality vs. EXIF

    Hello Alex,

    I know many bad implementation of EXIF data in cheap compact cameras.

    The problem with dSLR's is, that exposure measurement for digital sensors is not calcualated above the noise...
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    Sticky: Re: Anders Uschold Q&A

    Hello Jens,

    thanks for your question.

    First, what does it mean, a reduction of resolution by 3-4. In most cases we talk about linear resolution, that means lines or pixel per length unit.
    ...
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    Sticky: Re: Anders Uschold Q&A

    What do you mean saying micro contrast? Please explain.

    Anders
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    Sticky: Re: Anders Uschold Q&A

    Normally you can hardly use a MTF chart for digital resolution measurement. The problems are:

    1. MTF is a two-dimensional function. You measure contrast against frequency of structures. In the...
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    Sticky: Re: Anders Uschold Q&A

    Don't worry,

    there are only few people who understand these numbers. It is not a proof of your amateurness by far.

    The numbers just shall give you a comparable unit, whether on camera shows...
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    Sticky: Re: Anders Uschold Q&A

    Well, it's 11:30 PM. My bed awaits me. If there are some more questions tomorrow, I have a look on them.

    Pavel, are you shocked by my analogue obsession? You didn't answer to my list.

    Anders
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    Re: Focus Pocus!

    Hello Ray,

    after reading all of these information I guess the following:

    1. Your screen is badly adjusted, that's why your
    AF works. I that case, the deviation from seen focus and AF focus...
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    Sticky: Re: Anders Uschold Q&A

    Hello Horatio,

    I have checked my results:

    The cameras show the following mean standard deviation hat represents noise level over the the full brightness range, the lower the better, and input...
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    Sticky: Re: Anders Uschold Q&A

    >thanks for volunteering to do this!

    >i would like to ask you about multiple focus points.... what impact on >focus accuracy - if there is any impact - is there from having multiple >focus points?...
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    Sticky: Re: Anders Uschold Q&A

    Hi,

    I suppose you mean the article from BJPh. This article is for BJPh subscribers only, it is paid content. As I do sell my articles to several magazines, I am not permitted to send you the...
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    Sticky: Re: Anders Uschold Q&A

    Hello Horatio,

    it might sound strange to you, but usually all our tests for magazines are done in JPEG, highest quality available under default settings. The reason is quite simple:

    - In a...
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    Sticky: Re: Anders Uschold Q&A

    Hi George,

    one week ago only five pre-final samples of the Panasonic did exist worldwide and therefore a very limited number of Leica lenses. I had a touch&try on it. As far as I know no final...
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