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  1. Tim Tucker

    Depth of Field (Bokeh) lesson

    Practical application time, this is what I found with APS-C systems. As you approach the hyper-focal distance to infinity the dof may increase more but once you hit it then the increase in dof slows. The larger format doesn't until it too hits the hyper-focal distance to infinity. When it does...
  2. Tim Tucker

    Depth of Field (Bokeh) lesson

    I'm learning to look at things from a different viewpoint. Even though I do not communicate Ysarex's opinion I still read it all and find it interesting and I will question it. I don't see this as OCD, I just like to learn and Ysarex's viewpoint does make me look at things differently even if it...
  3. Tim Tucker

    Depth of Field (Bokeh) lesson

    Hmmm... Differentiate between 5 pages and 47? ;) As to your general comment, no I do not know how many actually understand it. We may have gone a little deep in places for a beginners forum but there were a lot of basics in there. And though we will check the boring bits you don't wish to see...
  4. Tim Tucker

    Depth of Field (Bokeh) lesson

    And I'm saying that there are too many examples where this is not true for it to be held as a general rule. The rule that dof is proportional to sensor size only really works of the same photo example (same fov, same subject distance and same f-stop) and only holds valid at portrait distances...
  5. Tim Tucker

    Depth of Field (Bokeh) lesson

    I'm simply saying that the smaller sensor looses it's dof advantage once you get past the hyper-focal distance to infinity. In short and simply terms it does not have more dof than larger formats (whether you give a crap or not) when the dof of the subject is within the range of the larger...
  6. Tim Tucker

    Depth of Field (Bokeh) lesson

    You still don't get it do you? You're saying y=x but in your proof you're specifying that the condition y=x must be met to be a valid comparison. I'm not making kitchen boards out of sugared cherries but explaining the flaws in your theory because you seem hell bent on linking smaller sensors to...
  7. Tim Tucker

    Depth of Field (Bokeh) lesson

    So I say c when I mean COC. Also I have been very busy hence the no reply, (having to finish building the new house so we could move in as we had notification that the purchasers wanted to complete in 5 days which thankfully fell through). But my real problem with your argument (that smaller...
  8. Tim Tucker

    Depth of Field (Bokeh) lesson

    In my very first example I threw out your condition of fov being constant and introduced focal length as being constant, and guess what happens? Dof decreases with smaller sensors. Now this is not the whole story, just as your examples are not the whole story, but your thesis that smaller...
  9. Tim Tucker

    Depth of Field (Bokeh) lesson

    No, the image formed at the sensor of light recording media is the same for the same focal length, f-stop and subject distance. Not the finished image. When you simplify the equation then dof is a function of how parallel the light rays from a point object are passing through the lens, which...
  10. Tim Tucker

    Depth of Field (Bokeh) lesson

    Joe, the circle of confusion is not a function of the sensor, it is not caused or defined by the sensor but the lens and primarily the diameter in mm of the effective aperture. Any camera with a smaller sensor uses a shorter focal length lens to take "similar" photos, (let's drop the "same" tag...
  11. Tim Tucker

    Depth of Field (Bokeh) lesson

    I really do not hold with this "equivalence", or same photo nonsense, (in fact it annoys me ;)), because it's so meaningless and misleading. If in your instance you hold exposure (or same f-stop) as constant and to satisfy the condition of the same photo you also have changed the focal length...
  12. Tim Tucker

    Depth of Field (Bokeh) lesson

    Not really. The difference in dof is due to the magnification of the image to the final viewed size. With all being equal then a 150mm lens will produce the same circles of confusion regardless of the sensor size, it's just how much you magnify it in the finished image, (and how that relates to...
  13. Tim Tucker

    Depth of Field (Bokeh) lesson

    I would have to disagree with a number of points here. The first is that aperture controls dof. It doesn't, it controls exposure. A lot of the nonsense I read is based on the assumption that aperture controls dof, but really all aperture does, and is calibrated for, is the accurate control of...
  14. Tim Tucker

    I feel like there is something missing with these.

    No, I actually scaled back the contrast and don't hold with the saturation slider. I'll leave you in @Ysarex's capable hands but mainly what I did would've been as follows: Calibrated my screen. Corrected the WB first, if you don't then you're really just enhancing any colour cast. Not move...
  15. Tim Tucker

    I feel like there is something missing with these.

    I'll concentrate on the processing, with an example. You're tone-mapping far too much, and what this does is equalise the tones and greys the colours. Which makes them all look the same. Whereas what you want is contrast, or difference between colour and tone. It is the difference that produces...
  16. Tim Tucker

    Which retro wide lenses are sharpest?

    As @Derrel says, wide angle lenses are an area that has universally benefited from computer aided design. All MF Nikkor wide angles are bettered by their more modern counterparts. You will find that although some MF Nikkor wide angles have a good reputation that the range, or "band", in which...
  17. Tim Tucker

    a lens between psychodelic & perfection

    I would have to disagree on a number of points. Though I would agree that the 35/1.4 AiS is a fine lens I personally think it's overpriced for what it is. It is not the lens that creates the effect, and certainly buying MF Nikkors does not give the "analogue look". That comes from observation...
  18. Tim Tucker

    beauty seen through a shop window

    No it's the lens. It happens when light is focussed through a lens or glass which does not have parallel surfaces. ;)
  19. Tim Tucker

    An Autumn morning around Rannoch Moor and Glencoe

    I like the cottage as well. But in the first two shots everything is so distant (The Black Mount), and in 5 & 6 at least 30% of the shots is tarmac compared to a narrow band of little hills. Stob Dearg (the end of the Buachaille Etive Mor) is a massive sentinal at the head of Glen Coe and Glen...
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