Review on 📷 Sigma 24-70mm f/2.8 IF EX DG HSM AF Zoom Lens - Optimized for Sony DSLR Cameras by Will Rahman

I really liked this lens for my K-5 and really wanted to like it but it just can't focus at all on my K-5 in live view. Just jump around everywhere. When live view is off, focus shifts slightly and photos look underexposed and washed out. All my other Sigmas work fine (10-20 zoom, 24mm prime) on my Pentax K-5. With this problem I ordered the Tamron AF 28-75mm f/2.8 SP XR Di LD Aspheric (IF) Aspheric (IF) Lens for Pentax DSLRs and it works great, great focus, lighter weight, smaller diameter/filter and much more cheaper. Price. One of the great things about this Sigma lens was its ultra-quiet focusing. I returned the lens to Amazon. I just found out online that this live focus issue is common and the lens has to be sent back to them for a software update. and very disappointed that this issue is not resolved before purchasing this lens. I just want the product to work and not have to go through hoops and jumps afterwards. But still I found the focus fuzzy and too dark, so I'm very happy with the Tamron 28-75mm 2.8 that I got instead. This Tamron is my first Tamron purchase. All other lenses I have are Sigma and Pentax (Kit 18-55, 50 fix). I am currently buying a Tamron 17-50 2.8 and am also looking for a Tamron 70-200 2.8 to complete my fast zoom range.