Featuring pots from Whelans Factory Outlet Sheerness
There was a bright shaft of sun light with deep shade either side and the photo captures if exactly. 15 minutes exposure pinhole 0.4mm focal length 70mm and using a yellow filter but no ND graduated filter.
The items in the foreground were about 3 feet from the camera
Same garden different direction The sun had moved round a turn of the camera about 20 degrees and another 15minute expose and again deep shadow at left and right edge of the picture.
Very good Charles.
ReplyDeleteBeing a novice at this, if you enlarged the hole slightly and shortened the exposure would you get a narrower depth of field?
If you enlarged the hole what definition there is would go and the picture would be more even less sharp. This is all because the pin hole is acting as the lens not as the f no. control.
ReplyDeleteThe pinhole size is determined by a calculation of the distance between the pinhole and the film plane.
One equation says the pinhole diameter is equal to 1/25 the square root of the distance between the pinhole aperture and the film plane (focal length)is the optimum.
Decreasing the pinhole size does not necessarily increase image sharpness for when the size is decreased beyond the optimum for the specified distance, diffraction causes a decrease in image sharpness.
With pinhole you have infinite depth of field that is from pinhole to infinity, to obtain a narrowed depth of field you then need to use a lens to focus the image and aperture control to obtain the depth of field you want.
All understood.
ReplyDeleteWhat a lovely garden we have!
ReplyDeleteI'm very taken wiv the plant pots!
ReplyDeleteYou have Jean but who works on it then!!!!
ReplyDeleteI cut the grass, Jean enjoys the planting out and a man who does, takes on all the hard graft !!!!
ReplyDelete