Diffraction and optimum aperture
Manual
Tai Shimizu
http://www.photosynthesis.co.nz/nikon/lenses.html#105micro
Micro-Nikkor 105mm f4.0 Diffraction
Posts Tagged: Micro Nikkor 105mm f4.0
– Nikon PN-11
Designed for exclusive use with a Macro-Nikkor 105mm F/4 fitted with a meter coupling ridge (AI, AIS-type), the PN-11 ring enables you to cover a reproduction ratio range of 1:1/2 to 1:1. Full-aperture metering and automatic maximum aperture indexing apply when the ring is used with cameras fitted with a meter coupling lever (AI-type cameras). The ring is fitted with a rotating tripod collar at the balance point of the camera/ring/lens combination. The collar is threaded to accept standard 1/4 inch tripod screws, and permits photography with the camera positioned either vertically or horizontally. Important! This ring cannot be used with a non-AI type Micro-Nikkor 105mm F/4 lenses.
- Function: Provides reproduction ratio of approximately 1:1 and perfect coupling with automatic aperture, TTL metering and AE mechanism
- Compatibility: 105mm f/2.8 Micro-Nikkor, 105mm f/4 Micro-Nikkor and 105mm f/4 UV-Nikkor lenses
- Length: 2.7″
- Diameter: 2.8″
- Weight: 8.6oz
- Tripod Collar: Yes
- Note: Use of step-down rings can cause vignetting
