tashley
Subscriber Member
So, one thing I noticed yesterday was that at F8 one has to place focus very carefully (or luckily) on the 30mm lens in order to get acceptably sharp foreground (and bottom corners) and yet maintain good infinity resolution.
So this morning I did some math that others might find useful
I am 5'9" tall (175cm). At that height, with the camera to my eye and held level according to the camera's built-in level, the nearest point in the frame is approximately 3 metres away (flat ground, ground level point).
Assuming I want a print that is 46" wide (in other words printed to 180DPI which will work perfectly well although it is of course always better to print at higher resolutions) and that the viewing distance is 24 inches, the required Circle Of Confusion is 23µ. That means that the hyperfocal distance is 5.55 metres.
Being phenomenally anal retentive, I took a tape measure and set it to that distance, focussed on the mark, set it to F8 and levelled it and fired away.
It doesn't quite work. It's pushing it a touch, but 6.55m does work. Now I just need to work out a way of telling the camera to focus on that distance... or of memorising that distance so well that I can always pick a point.
Hope that helps someone!
So this morning I did some math that others might find useful
I am 5'9" tall (175cm). At that height, with the camera to my eye and held level according to the camera's built-in level, the nearest point in the frame is approximately 3 metres away (flat ground, ground level point).
Assuming I want a print that is 46" wide (in other words printed to 180DPI which will work perfectly well although it is of course always better to print at higher resolutions) and that the viewing distance is 24 inches, the required Circle Of Confusion is 23µ. That means that the hyperfocal distance is 5.55 metres.
Being phenomenally anal retentive, I took a tape measure and set it to that distance, focussed on the mark, set it to F8 and levelled it and fired away.
It doesn't quite work. It's pushing it a touch, but 6.55m does work. Now I just need to work out a way of telling the camera to focus on that distance... or of memorising that distance so well that I can always pick a point.
Hope that helps someone!