Lomography Diana + & F+ f-Stops

110mm Soft Telephoto Lens:

Sunny: f32

Partly: f22

Cloudy: f16

75mm Normal Lens:

Sunny: f22

Partly: f16

Cloudy: f11

55mm Wide Angle Lens:

Sunny: f16

Partly: f11

Cloudy: f8

38mm Super Wide Angle Lens:

Sunny: f11

Partly: f8

Cloudy: f5.6

20mm Fisheye Lens:

Sunny: f5.6

Partly: f4

Cloudy: f3

Source: Published values for the 75mm lens as they appear in Plastic Cameras Lo-fi Photography in the Digital Age by Chris Gatcum. Using those, the aperture diameters were computed as follows: Sunny 3.4mm, Partly 4.7mm, Cloudy 6.8mm. With that aperture f-stops were calculated with the formula: Lens Focal Length / Aperture Diameter = f-Stop