Review on 📷 Sigma 18-300mm F3.5-6.3: The Ultimate Contemporary Advanced Lens by Tracy Jones

I received this lens just yesterday. Today "tested" it on a Canon 24-105 f4.0 L lens. No doubt the Canon I tested with is sharp, especially since the APS-C camera's sensor doesn't take advantage of the edges of the Canon full-frame lens. Since the Canon L is a full-frame lens, the test isn't entirely fair. With comparable focal lengths, the Sigma performed very well. I tested wide open at 24mm, 50mm and 105mm and tested at f11. I also tested the Sigma on 18mm, 200mm and 300mm. The camera was on a tripod with mirror lockup and shutter lag. I focused on two sheets of printed paper taped to the board. I focused on the same spot in the middle of the paper for all shots. Results. The sharpness of the Sigma is basically the same as that of the Canon at all focal lengths, even if the edge sharpness is sometimes not as good. Stopping down to f11 helps sharpen edges in all directions. In the Sigma's extended range at 200 and 300mm, stopping down A LOT helps sharpen the edges. I found the contrast to be lower at shorter focal lengths than a Canon L lens. You can fix this in Lightroom if needed. Maximum aperture has increased from 3.5 at 18mm to 4.0 at 28mm, 5.0 at 50mm (hmm, not really), 5.6 at 105mm and 6.3 at 200mm. Conclusion: I will keep it for traveling and hiking. as the Canon is a comparable brick in weight and size, but when I really need super edge sharpness and can't stop I use the Canon L lens.