Charts for fov and sweetspot (1 Viewer)

Hi all,

I have done some maths and drawn up a couple of drawings. One shows the relative sizes of different fovs and the other what sweetspots as percentages of the fov area look like compared to each other.

I have been meaning to do this for my own benefit for some time and finally got round to it. I find it is much easier to grasp the these concepts when I can see them as a drawing rather than a chart.

Thought they might be helpful to others, so here they are.

Best wishes
Martin

Nice charts, at what distance should they be set from the binoculars? Thanks.

tpcollins said:

Nice charts, at what distance should they be set from the binoculars? Thanks.

Click to expand...

Hi,

they're not really for looking at through bins. I made them so I could see on paper how different fovs looked relative to each other and how circles looked as percentages of each other because people always talk about sweetspots as percentages.

I knew that the area of one circle as a percentage of another is hard to visualise an the difference often surprises people so I suspect that often people get it wrong when they estimate the sweetspot.

I wanted something to help me see how these things compared.

I suppose, with a bit more maths (ignore the s if you're on the other side of the Atlantic ) and making sure of the scale, the drawing of fovs could become a chart to evaluate the fov of a pair of bins. I'll ponder that one.

I also made them to practice using AutoCAD which I am teaching myself.

I shall ponder them and see if i can figue out how to make them of use in practice.

Thanks TP, you may have come up with a great improvement in their usefulness!

Best wishes
Martin

Thanks Martin for the explanation. After I wake up some more today, I would think I could figure my minimum close focus distance is that would see clearly and take my Machinist's Handbook (trig tables)and calculate what the diameters for those degrees should be for a given distance.