03-23-2015, 05:53 PM
Navitar 12mm f/1.2. Designed circa 1954 before the first computer aided optical design software was released in 1961. You can find it online as "Elgeet 12mm f/1.2" since it was manufactured by the Elgeet company. In reality it was more like f/1.3 - f/1.4 but that would be seen by the photography as "T/1.4" instead of an actual rounding of the F number, though that is extremely common (e.g nikon 24/1.4 is f/1.45).
Here's the MTF as manufactured:
http://i.imgur.com/RwlI9EB.jpg
It was actually nearly perfectly corrected for all third order aberrations which were all that was very well understood at the time. I did an optimization of it as part of a case study to see what could be done without changing the design from what was possible in its day and age and managed to produce a manufacturable and toleranced lens with this nominal MTF:
http://i.imgur.com/g5IUsOe.jpg
IIRC the tolerance was MTF of 0.4 at 30lp/mm for any image height.
Here's the MTF as manufactured:
http://i.imgur.com/RwlI9EB.jpg
It was actually nearly perfectly corrected for all third order aberrations which were all that was very well understood at the time. I did an optimization of it as part of a case study to see what could be done without changing the design from what was possible in its day and age and managed to produce a manufacturable and toleranced lens with this nominal MTF:
http://i.imgur.com/g5IUsOe.jpg
IIRC the tolerance was MTF of 0.4 at 30lp/mm for any image height.