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bobn2

bobn2

Lives in United Kingdom Worcestershire, United Kingdom
Joined on Aug 28, 2007

bobn2's recent activity

  • Re: For example, if an mFT photographer shot a scene at 50mm f/2 1/200, there is no reason the FF photographer could not shoot the scene at 100mm f/4 1/100.

    I assume you meant

    if an mFT...

  • 'But, while it may look a lot like a D610, the D750 feels rather different, thanks to its magnesium alloy shell. This allows it to be lighter than the 610, which uses a plastic composite body on a...

  • Possibly you're capable of seeing that your source is saying the opposite of what you are. You claim that the light decreases due to the inverse square law as the focal length gets bigger. He says...

  • @dtmateojr - "Grain is what you call noise in digital." - up to a point, they are both a reflection of haow many photons you've counted.
    "Does the grain change when you expose 35mm and 8x10 Ektar...

  • @ dtmatejor
    If you'd beother ed to look at the post Joe referred you to, rather than just dismissing it, you'd have seen that the equivalence for film was based on just the same idea as digital....

  • @Androole re:"Of course, in these examples the smaller sensors will actually tend to be slightly better in terms of real-world signal-to-noise ratio. 1" is not a full stop behind M4/3, M4/3 is not...

  • When equivalence might be useful:
    1. When someone who has developed their technique on one format is thinking of moving to another, it gives a guide as to which settings to use to achieve the...

  • @boggis the cat re: "almost nobody wants to reproduce a shot as closely as possible using two systems, so "equivalent photos" is a pointless confusing factor."
    I don't think that's true. I don't...

  • @ Fygaren
    "Theta is the range of half-angles of whitch the light can enter the lens."

    Which is defined by?.....

    "I dont see the contradiction.Both depends on aperture is what Ive been...

  • @ Zdrasviti, re: "pixel size is the most important thing in terms of image quality thats why 12 mp full frame ( d3-d700) sensor is still the lowest noise level on planet."
    Wrong on both counts....

  • @MichaelJP, re: "that is the sensor performance at different ISO,
    that is how the sensor behaves with more amplification of the signal from each pixel".
    The signal to noise ratio of a competently...

  • @fygaren

    Interesting. I found the following that supports it:
    "f/number = 1 / [2sin(theta)]
    For very small values of theta sin(theta) can be approximated simply by theta which then allows us to...

  • @fygaren

    Re: "Interesting. I found the following that supports it:
    "f/number = 1 / [2sin(theta)]
    For very small values of theta sin(theta) can be approximated simply by theta which then allows us...

  • In atomic physics, it's conventional to define masses in atomic units, the mass of a proton or neutron. However, mass is energy, so unfortunately the binding energy of atoms changes their mass, so...

  • The magnification changes the spatial distribution of the noise, which might render it more visible. The SNR is determined by the number of photons captured, so strictly cropping reduces the noise,...

  • @rfsIii, re "There is nothing simple about optical science especially at the level we're discussing."
    Sorry, this is an application of very simple 'optical science' - from the introductory text....

  • @fygaren, re:"The hyperfocal formula you refer to is a simplified, easier to use in the field, version of Louis Derrs derived formula from 1906. His formula is considered to be the strictly correct...

  • @fygaren re: "I have already explained how one is the result of the other and not the other way around, you can not "set" the result and think what makes the result follows, this is...

  • @Fygaren
    Re: the f-number show the quantitative measure of lens speed so that you can set the right shutterspeed (before we had auto metering). An example of use is the sunny 16 rule."
    And so? You...

  • @ nigelht, re: "There are still differences. Just like there is a difference between using a TC and cropping but it's close enough to get the idea of what cropped sensors do."
    And if you put a 2x...

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bobn2 has not added any gear yet.
Total messages 5
Threads started 0
Last post Oct 6, 2013
Total comments 49
Total likes 63
Last post 1 week ago
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Photos uploaded 211
Last upload Nov 28, 2010
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