Just like Kiwikat a couple of months ago, I'm having a hard time choosing which new piece of gear I should buy.
I have two choices. Sony has released a 28-75 f/2.8 SAM (Smooth Autofocus Motor, don't confuse it with SSM which is a faster AF motor) a while ago to go along with the A850 24.6 MP full-frame DSLR. As I have been looking for some time for a faster (brighter aperture) 'standard' lens I thought "That's the one I need!".
Now, the only problem is that 28mm on a 1.5 crop camera means 42mm on full-frame which is, frankly, not that wide. But I could get the new 18-55 kitlens with it to have a bit more of wide-angle (although 24mm would be perfect, I never use <24mm actually...not into landscapes or anything). But, I'd have to swap lenses regularly, which is not really a good thing when you're shooting outside all the time.
Here the other lens comes into the picture: the Sony Carl Zeiss ZA 24-70 f/2.8 SSM. Tack-sharp, wide-open at all focal lengths. Blazingly fast when it comes to AF. But expensive: at the shop Ferry mentioned in the 'Need a big lens ?' thread it's € 1500 (would be way cheaper if I could order it on the US or the UK, but I don't want it to get damaged during shipping...and I don't plan going to the US or UK myself anytime soon, at least not prior to Flying Legends in July at Duxford).
The 28-75 + 18-55 would be around € 900...that's a considerable amount of money I'd be able to spend. I could save the € 600 to help pay the A7XX (to be released Q4 2010/Q1 2011).
But I'd have to switch lenses all the time...and I don't like that. 28 or 24mm is a small difference, but once you go below 35mm 4mm becomes a huge difference.
If you'd like to see the difference in IQ between the Sony 28-75 SAM and the 24-70 of Sony/Carl Zeiss...here are two nice samples...same aperture, same shutter speed, same focal length. It's a significant difference in my opinion. It's a Tamron that's used here to compare them but optically the Tamron and the Sony are about the same, the Sony does have a better build quality and is faster to focus.
http://www.alphamountworld.com/forum...er/2010-2/5205
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