Tom Axford

Tom Axford

Lives in United Kingdom Midlands, United Kingdom
Joined on Aug 11, 2010

Tom Axford's recent activity

  • You are correct. Strictly speaking the formula 10 x 200/85 is an approximation. However, the error is tiny, it is completely insignificant for practical purposes. The errors in lens manufacture are ...
  • 10 x 200/85 = 23.5 feet
  • I think it is very likely that these have been created in Photoshop by merging two separate images (one of the people and one of the blurred lights).
  • It refers to the size of the image. Yes, it would. You can take the image on any camera at any size and resize in any decent image editing program (you may want to crop it first to get the subject ...
  • I've just tried with Firefox and it always defaults to the threaded view for me too. It gives some other odd behaviour as well. I suggest you try Chrome (it's a free download from Google)!
  • This is still the case for me. I use both Chrome and Safari as browsers (on a Mac) - they both behave the same in this respect.
  • You are correct - that is the fundamental lens equation. This is where I wish I had some mathematical software that I could use to draw a diagram! Anyway, I'll try to explain without a diagram. Con ...
  • Replied in ???
    Ok, I know what you mean now! I just hadn't encountered that terminology. I think it probably depends somewhat on the particular camera. I can only speak for my own Lumix GM1 which has a base ISO ...
  • Replied in ???
    I have never heard of "pull down ISO" or "push up ISO". Where have you encountered these terms? I had a quick look on Google and all the top hits were to do with bodybuilding rather than photography!
  • I agree with Mako2011 that it looks like motion blur, probably due to movement of the camera. The simplest solution is to increase the shutter speed along with the necessary increase in aperture or ...
  • Replied in Math police
    The statement I made: "The key fact to know is that the amount of background blur you can get is dependent primarily on the real aperture" is correct. I think you are confusing depth of field with ...
  • The camera manufacturers do not make it very easy for you to see how good (or bad) their cameras are in this respect. However, with a little maths and knowing some formulas, you can work it out for ...
  • I have encountered people with a slight knowledge of diffraction, who know that very small apertures give low resolution and they then assume that this is a more general rule of optics than can be ...
  • Replied in Lens Speed
    A very interesting question in today's world of digital photography. I can think of a couple of other reasons that some people care about lens speed. First, in DSLRs the viewfinder uses the taking ...
  • I think the lack of vibrancy is inherent in the scene at the time that you shot it. There is plenty of vibrancy in the tree in the foreground on the left. The lack of vibrancy in more distant ...
  • Since starting to use Lightroom 5 for pp, I routinely use it to rename all my images to the date and time. If I do need to separate out the images from a particular camera, LR does that very ...
  • I'm strictly amateur so I don't feel constrained to use a large DSLR in order to look like a serious photographer. Since getting the GM1, it has been my main camera. Broadly I agree with you that ...
  • Unfortunately, what you say is not strictly correct. Once the highlights are clipped, there is no way of recovering them. The information has been lost and it is mathematically impossible to ...
  • My advice would be to stick to whatever you are currently doing. If you normally take jpegs, then do the same for b&w. I think all the arguments about whether to shoot in jpeg or raw apply much the ...
  • LR5 is very good at handling a larger dynamic range than can be coped with in 'straight' processing (i.e. not using the sliders for Highlights, Shadows, etc.). I can't really tell you how to avoid ...
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