Elements and groups?

Started 4 weeks ago | Questions thread
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Leo_B
Leo_B Regular Member • Posts: 302
Elements and groups?

Comparing some lenses, the Tamron 90f2.8 from Sept. 2012 says it has 11 elements in 14 groups. How can you have more groups than you have elements? The Tamron 90f2.8 from Feb. 2016 says it has 14 elements in 11 groups. I presume both should say that but don't know enough to know for certain. So can you have more groups than elements and if so how does that work?

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Canon PowerShot G15 Canon EOS 80D Canon EF-S 15-85mm f/3.5-5.6 IS USM Sigma 10-20mm F3.5 EX DC HSM Canon EF-S 18-55mm f/3.5-5.6 IS STM +2 more
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