Tokyo Kogaku R. Topcor 90mm F/3.5
Short telephoto prime lens • Film era • Discontinued
- Announced:
- · 1958
- Production status:
- ● Discontinued
- Country of design:
- · Japan
- Original name:
- · Tokyo Kogaku R.Topcor 1:3,5 f=9cm
- Class:
- · Slow full-frame short telephoto prime lens
- System:
- · Topcon (1957)
Specification
| Optical design: | |
| 35mm full frame | |
| 90mm | |
| F/3.5 | |
| 3 elements in 3 groups (Cooke triplet) | |
| Topcon [44.7mm] | |
| 27° (35mm full frame) | |
| Diaphragm mechanism: | |
Diaphragm type: | Preset |
Aperture control: | Preset ring + Aperture ring |
| 10 (ten) | |
| Focusing: | |
| 1m | |
| <No data> | |
Focusing modes: | Manual focus only |
Manual focus control: | Focusing ring |
| Physical characteristics: | |
| 190g | |
| ⌀?×52mm | |
| Accessories: | |
| Screw-type 49mm | |
| 51mm - Snap-on round | |
| Not available |
Sources of data
- Beseler Topcon booklet (1966).
- Beseler Topcon D1 booklet.
- Guide to your Beseler B Topcon booklet.
- Guide to your Beseler C Topcon booklet.
- Guide to your Topcon-R booklet.
Tokyo Kogaku R. TOPCOR series
Along with plain Auto-TOPCOR lenses, part of the first generation of lenses designed for Topcon R series 35mm SLR cameras with the Topcon bayonet mount.
- Robust, all-metal design, top quality mechanical workmanship;
- Professional black finish;
- Preset diaphragm;
- Extremely accurate manual focusing with knurled focusing ring;
- Single-layer anti-reflection coating.
From the editor
Optically this lens is based on the screw-mount Topcor 9cm f/3.5 for Leotax 35mm rangefinder cameras.
Other short telephoto prime lenses in the Topcon system
| ■Topcon mount (4) | |||||||||
| Tokyo Kogaku RE. Auto-Topcor 85mm F/1.8 | A | 6 - 5 | 0.90m | ⌀62 | 1970 ● | ||||
| Tokyo Kogaku Auto-Topcor 100mm F/2.8 | S | 5 - ? | 1.20m | ⌀49 | 1957 ● | ||||
| Tokyo Kogaku F. Auto-Topcor 100mm F/2.8 | A | 5 - 3 | 1.20m | ⌀49 | 1960 ● | ||||
| Tokyo Kogaku RE. Auto-Topcor 100mm F/2.8 | A | 5 - 3 | 1.20m | ⌀49 | 1965 ● | ||||