Exploring Extension Tubes.
Nikon D7100
The sensor size of this camera is 23.5mm x 15.6mm.
A, 1920, Canadian nickel.
The diameter of this Canadian nickel is approx. 15.6mm.
This is the lens, Nikkor 18-5mm.
These are the extension tubes by Neewer
12mm, 20mm, and 36mm.
The lens with no tubes.
18mm, A=F22, 9cm distance to lens, 23cm distance to sensor.
18mm, A=F5.6, 12cm distance to lens, 26cm distance to sensor.
55mm, A=F5.6, 12cm distance to lens, 26cm distance to sensor.
55mm, A=F22, 12cm distance to lens, 26cm distance to sensor.
With 12mm tube extension.
55mm lens + 12mm tube, A=F5.6, 8cm distance to lens, 23cm distance to sensor.
55mm lens + 12mm tube, A=F22, 8cm distance to lens, 23cm distance to sensor.
18mm lens + 12mm tube, A=F22, 1cm distance to lens, 17cm distance to sensor.
18mm lens + 12mm tube, A=F5.6, cannot focus.
With 20mm tube extension.
18mm lens + 20mm tube, A=5.6, cannot focus.
18mm lens + 20mm tube, A=F22, cannot focus.
55mm lens + 20mm tube, A=F5.6, 5cm to lens, 21cm to sensor.
55mm lens + 20mm tube, A=F22, 5cm to lens, 21cm to sensor.
With 36mm tube extension.
55mm lens + 36mm tube, A=F5.6, 3cm to lens, 20cm to sensor.
55mm lens + 36mm tube, A=F22, 3cm to lens, 20cm to sensor.
