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  1. W

    Binocular Evolution I: Field of View

    I'm not too fussed about a mega wide fov, perfectly happy with 60 ish degrees apparent but anything over 110m at 1000m is fine by me for practical use, whether it's in a 7x 8x or 10x. Talking of which my brief bit of birding this morning didn't require a huge fov!
  2. W

    Binocular Evolution I: Field of View

    So to get mildly scientific, I have a degree in psychology so I'm a gardener which says about all you need to know about my academic credentials! I just set up 2 binoculars with their oculars exactly 5m away from a white wall. One is an 8x56 and the other is an 8x32. I projected the phone...
  3. W

    Binocular Evolution I: Field of View

    I'm finding puzzling results. Just tested the method using 2 8x mag binoculars an 8x56 and an 8x32 the '56 has a field of view of 133m @1000 and the '32 has a field of view of 145m @ 1000m. It's important that the small Led is placed at the eye relief distance from the ocular or the results...
  4. W

    Binocular Evolution I: Field of View

    I'm not sure of the logic behind it, only discovered it (for myself- I'm sure many have written about it before!) when messing about owling. My assumption which is bound to be corrected in short order on is that going through the objectives will only give you an idea of the exit pupil and...
  5. W

    Binocular Evolution I: Field of View

    You can get a good idea of the Fov by shining a phone torch through the eye piece of each and seeing how wide the projected circles of light are on a wall or similar.
  6. W

    Binocular Evolution I: Field of View

    Yes that's what I meant. A very interesting read!
  7. W

    Binocular Evolution I: Field of View

    I Yes I think the photo through the srga highlighted this, lots of field curvature and blurry edges and a fair amount of pincushion distortion!
  8. W

    Binocular Evolution I: Field of View

    They look nifty. Might be a bit of field curvature making the boat on the left sharp. If you see the branches in the foreground on the LHS are also quite sharp but the boats to the right are not. Field curvature usually brings things that are closer to you into sharper focus the closer they are...
  9. W

    Binocular Evolution I: Field of View

    I too bemoan the demise of the porro. I suppose the ease of waterproofing a roof compared to them is another reason alongside size and weight. I think there's definitely room in the market for someone so step out and make one, just look at the prices of Nikon se's now!
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