Canon new patent surfaced over the web, the 15-85mm F3.5-5.6covers an extra ordinary range and will be extremely suitable for upcoming pro and mid range APS-C DSLR cameras, take a look at the lens details below (translated via google)
- Patent Publication No. 2015-75570
- Published 2015.4.20
- Filing date 2013.10.8
- Canon patents
- Positive and negative grain positive and negative positive 5-group configuration (Examples 1 and 2)
- 4-group configuration of positive and negative grain-positive-positive (Examples 3 and 4)
- Inner focus (the second group)
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