While everyone is talking about the EF 40mm f/2.8 STM ($199, click here), there are two more new prime lens that Canon released this year, the EF 24mm f/2.8 IS USM ($850, click here) and the EF 28mm f/2.8 IS USM ($800, click here). Both lenses are the second iteration, adding Image Stabilization and USM to its features. They replace some rather old, and affordable, lenses, the EF 24mm f/2.8 ($374, click here) and the EF 28mm f/2.8 ($259, click here). These were solid performing, light-weighted and small consumer-grade lenses. The new iterations are considerably more expensive, having a price tag of approximately $850 (24mm) and $800 (28mm). Besides having IS and USM, the new lenses have seven curved aperture blades (compared to five in the previous 28mm and six in the 24mm). So, how do this two, little commented (why?) lens perform? Roger Cicala at lensrentals.com wanted to find it out. Imatest was used. The results are not earth-shattering (these are not L lenses). Nevertheless, the primes have a good performance, proving that they are well suited for different uses. The IS works fine, and optical performance is good. The downside is probably the fact that the price raised by 200-300%, if compared to their predecessors. While the EF 40mm f/2.8 STM is a no-brainer, you will probably carefully think for what you will need the new 24mm and 28mm. Given the price, these are not lenses most of us will buy just to have them. However, there are various settings where these primes might be the right choice, e.g. night photography (f/2.8 and IS). And don’t forget that on an APS-C body, the 28mm has a normal focus length, becoming a ~44mm.