RMC Tokina Doubler (2XCV)
Teleconverter • Film era • Discontinued
- Announced:
- · No data
- Production status:
- ● Discontinued
- Country of design:
- · Japan
- Original name:
- · RMC Tokina DOUBLER
Specification
| Optical design: | |
Magnification factor: | 2x |
| 35mm full frame | |
| Canon FD | |
| Contax/Yashica | |
| Fujica X | |
| Konica AR | |
| M42 | |
| Minolta SR | |
| Nikon F | |
| Olympus OM | |
| Pentax K | |
| 7 elements - 6 groups | |
| Physical characteristics: | |
| 201g (Nikon F) | |
| ⌀63×41.2mm (Nikon F) | |
| - | |
| - |
Source of data
- Manufacturer's technical data.
Manufacturer description #1
Doubles the focal lengths and greatly expands the shooting ranges of all telephoto lenses. The small, lightweight design is excellent for the travelling photographer.
Manufacturer description #2
AUTOMATIC DIAPHRAGM COUPLING
DOUBLER has an automatic coupling device to maintain the original coupling between lens and camera so that the automatic or semi-automatic diaphragm of the master lens remains perfectly workable as before. As this coupling device may have a projecting pin according to the type of camera for which it is intended, take great care not to bend or break this pin.
APERTURE OF MASTER LENS
RMC TOKINA DOUBLER is unusable with master lens at brighter than f/1.7 aperture owing to its front element serving the purpose of a fixed diaphragm. Take care that even when set to f/1.4 or f/1.2 the master lens actually works at f/1.7 only (corresponding to the effective F-value of 3.4).
LENS APERTURE AT TIME OF SHOOTING
DOUBLER being a conversion lens has the nature of magnifying all characteristics of the master lens, hence it is advisable to use the smallest aperture possible during the shooting.
At full aperture, as even the slightest flare of the master lens would be magnified it is necessary to stop down the aperture by more than 2 f-stop value from full aperture, when corresponding sharp images can be obtained for each f-value.