With two excellent, similarly-priced general purpose zooms available for Canon users, both of which feature an f/4 maximum aperture, weather sealing, great AF performance and image stabilization, choosing between the EF 24-70mm f/4L IS USM and EF 24-105mm f/4L IS II USM can be a challenge.
The primary and significant advantage held by the 24-105 f/4L IS II is the extra 35mm of focal length range on the long end.
The 24-70 f/4L IS is a smaller and slightly lighter lens. It is 0.99" (25mm) shorter when retracted (actual measured length) and 1.25" (31.8mm) shorter with the hood installed. The 24-70 weighs 6.7 oz. (189.9g) less with hood installed (actual measured weight). Are these differences? Yes. Are they significant ones? Possibly.
For many, a more significant advantage of the 24-70 is its very impressive macro capability. A 0.70x maximum magnification from a non-prime-macro lens is eye-opening and significantly more impressive than the 24-105L II's 0.24x spec. However, it should be kept in mind that a 12mm extension tube can push the 24-105 to 0.60x maximum magnification. Disclaimer: I have not made an image quality comparison with the extension tube in play.
Image quality comparisons I have made show that:
The lenses are more similar than they are different in terms of sharpness. The 24-70 has less CA at 24mm, but more at 70mm. The two lenses have a similar amount of vignetting aside from at 24mm where the 24-105 has an advantage even stopped down. The 24-105 shows less flare effects while the 24-70 has less linear distortion.
Affecting image quality on a limited basis is the aperture blade count. The 24-70 has 9 blades vs. the 24-105 L's 10. This difference will primarily be noticed when point light sources are photographed at narrow apertures, with the odd blade numbered aperture creating 18-point sun stars vs the even's 10-point stars.
On the whole, I would not consider image quality to be a primary differentiating factor between these two lenses.
There is a minor difference in these lens' IS systems. The 24-70 features Canon's 4-stop Hybrid Image Stabilization, correcting both angular and shift movement in macro mode. The 24-105 L has 4-stop non-Hybrid Image Stabilization.
If price remains a deciding factor for you ... the Canon EF 24-70mm f/4L IS USM's retail price is slightly lower than the freshly released EF 24-105mm f/4L IS II USM's, though rebates will likely increase or decrease the price differential from time to time.
This short video discusses one of the six lighting principles I teach during my light painting workshops. This principle is : The Angle of Reflection is Equal to the Angle of Incidence. The video demonstrates that changing the angle of the light is sometimes needed to achieve certain reflections.
You can find more of Herold Ross's tutorials here.
In 1962, the US government prevented US citizens from traveling to Cuba. In 2015 the US and Cuba started to normalize diplomatic relations. It is now easier for US citizens to travel to this island nation. This is good news for all photographers, including underwater image-makers. Jardines de la Reina (Gardens of the Queen), is an archipelago that has been an underwater national park since 1996.
Join Larry and Olga as they explore this rich underwater environment.