Optical features
Optical design and chromatic correction
Takahashi has developed an air-spaced ED triplet objective (3 lenses in 3 groups). This triplet consists of a lens of ED glass (S-FPL53) laid out between 2 crown lenses air-spaced by a mean chock. Alike the TOA objective, optics have been designed and calculated according to the high requirements of the current numerical imaging.
Spots diagrams
The spot-diagrams give a good idea of the results obtained on the image circle, whether it is at prime focus or behind optical accessories. The 35-FL field corrector shows all its effectiveness in wide field imaging with DSLR cameras, for example.