New Tamron patent surfaced over the web, the Tamron 300mm F2.8 Lens designed for full frame Mirrorless camera, we know that currently no Full Frame mirrorless available/announced in the market, according to sources Tamron is close to Sony and Canon and we may see a Full-Frame mirrorless NEX OR FF EOS- M very Soon.
Self-interpretation and summary, Patent Documents
- Patent Publication No. 2012-242504
- Release Date 2012.12.10
- Filing date 2011.5.17
- Related 2012-242505
- Example 1
- Focal length f = 294.00mm
- Fno. = 2.88
- 2ω = 9.3 ° angle of view
- 19 sheets 16 groups lens configuration
- Three 3 aspherical surface
- (Abbe number 81.6) three low-dispersion glass
- (Abbe number 70.4) one low-dispersion glassTamron LD glass is standard, I did not know that more than 80 or more than 70 such
- Positive and negative polarity
- Inner Focus (the third group for focusing)
- (Adjusted for the fourth group in the group of anti-vibration) shake
- Costs in the form of inexpensive glass in one of the first lens group
- One costs the consists of the second lens group
