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Grim Fandango

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  1. You both have mega cool portraits! That's my only excuse and I'm sticking to it!
  2. Nah, I got the pair of you confused as one person! I combined your disagreement with me with zaks blog post etc... don't worry about it, the post above I feel is good information for people or easy enough to ignore
  3. My apologies then, you were correct! In truth, my first contact with you was in the piracy thread, where you were needlessly rude and caustic and I really only skim through your posts giving them minimal attention because, quite frankly, I don't like you.
  4. It's like if I told you I was shooting my lens wide open and you all jumped on me telling me that if I used screwdrivers on my lenses then my warrenty would be void. It's obvious that despite the words I used, I just used shorthand to refer to how I had set my iris. And likewise, to me the idea that you would buy a lens without understanding the picture it will give you on your cameras compared to your other lenses, well, lets just say, my jaw has hit the floor and it won't be being picked up for quite a long time. I literally didn't think that this needed to be explicitly stated.
  5. Yes, well I'm new here and I honestly thought this stuff was basics 101 and you would all understand what I meant. Clearly, I misjudged! Of course nothing stops you from speedboosting the sigma onto a m4/3, but the conversation was talking about emount sonys.
  6. No, if you stick that sigma on a crop frame camera and open it up to 1.8, you will get the precise same image at f2.88 on the canon with the speed booster on that camera for any given focal length. That gives you a 0.8 twist on the aperture dial of extra speed that is not avaliable to the sigma. Not a life changing amount I grant you, but mathmatically there.
  7. Bokeh - a term used to subjectively describe the way a lens renders an out of focus area. Is not measured by aperture size or focal distance, but in rather more fanciful ways, such as "jittery", "creamy", "lively" Circle of Confusion - The flattened spherical area rendered acceptably sharp by a lens to be described as in focus. Determined by a complicated function unique to each lens, commonly able to be moved and resized/shaped by a user using the aperture and focus controls on a camera Background Blur - Any part of the image that is in the background of an image and outside of the
  8. We are not talking about leaving a lens in place and putting a crop sensor behind it, we are talking about putting a different lens that throws a smaller circle. But regardless, lets talk through your scenario, step by step. You put a lens on a tripod. It creates an image in a circle, lets say 44mm behind the lens. You place a sensor behind that lens. It is a 1m by 1m sensor. Luckily, it's a really large format lens. You measure the number of photons striking the sensor and ignoring the quantum problem of changing the energy by measuring it, you find that exactly 1,000,000 photons strike the s
  9. Then you will have literally no problem proving that! Get two cameras with different size sensors, stick two lenses on the front of them set to the same f-stop number, and try to take identical photographs with them. When you give up because the bokeh in one is far more out of focus than the other for the same frame, apply my formula and then take those same photos. Or just watch the video I posted above where they perform that precise test.
  10. The F-Stop number is a ratio, between the focal length and the aperture, so if you have a 100mm lens with an aperture opening of 50mm, it is set to f2.0. But a 100mm lens that covers a full frame sensor and a 100mm lens that covers a m4/3 sensor are very, very different to each other, despite sharing those two common measurements. The difference in designs manifest in the size of the image projected by the lens. The aperture blocking certain angles of light reaching the sensor is the same, thus the out of focus areas will be the same amount out of focus, but your 100mm lens on a m4/3 lens
  11. This explains things better than I can:
  12. My apologies, in my rush, I had confused you with DPStewart
  13. And don't forget that while it has the DOF of a 1.8, in light terms, it is illuminating like a 2.8 on a crop frame sensor - making the speed boosted 70-200 faster
  14. And here is my evidence: https://ec.europa.eu/jrc/en/publication/eur-scientific-and-technical-research-reports/online-copyright-enforcement-consumer-behavior-and-market-structure Taken at face value, our ndings indicate that digital music piracy does not displace legal musicpurchases in digital format. This means that although there is trespassing of private propertyrights (copyrights), there is unlikely to be much harm done on digital music revenues. http://www.lse.ac.uk/media@lse/documents/MPP/LSE-MPP-Policy-Brief-9-Copyright-and-Creation.pdf The creative in
  15. OK, Here: BTW, before I start, I'm a new user and posting a list of links probably isn't going to go well for me. So I'll do it in the next post, so you at least will know why I've gone silent Incidently, while I'm at it, why don't you post your evidence to support the claimed 10% you wrote about in that blog post. To save you an hour or two googling, the best figure you will find is the widely derided 6-7%, rightly ignored because it was based on "industry predictive models", i.e. someone thought that sounded about right. You'll also find a student paper which talks about
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