Sigma 50-100mm f/1.8

My one gripe about my 18-35mm F1.8 isn't really the weight, it's the focusing which can be a bit hit/miss. I've got the dock and I have tuned it although I'm sure it could be tweaked a little better but I'm rarely in the mood to sit there for hours checking focusing.

Sigma are doing well from their new premium lenses and I can cope with the weight of them (which seems to be the main downside of all their new lenses) so I just hope they keep working at the focusing. I'm sure it's not easy when Canon certainly won't be helping them but it's pretty important they keep improving it.
 
I did my tweaking by live view focus (with digital zoom) and then switching to normal focus. If the marker moved when refocusing then I adjusted. You just have to reposition the camera for each distance and then make a note of roughly how much correction to make. Repeat a couple of times and I had it nailed. I used a bank note as it has a good wavy pattern to focus on.
 
The focusing works fine for the most part but sometimes something makes it go mental and focus on something behind.

The first few times I thought it was me just forgetting I had more than one focus point enabled etc and it focusing on something behind but I've seen it go weird since when I know I've only had a single point enabled.

I guess we'll what the reviews are like! A 50mm STM will be a lot cheaper and will suit me fine since I don't use that range much but I always appreciate flexibility so who knows :)
 
SDK^ said:
The 85-135 F2 zoom is pure speculation.
Zooms are heavier and usually 1 stop+ slower than a similar range prime E.g. The Sigma 24-35 F2 is 33% heavier and 1 stop slower than the 24/35 F1.4 primes. I'll take the lighter & faster lens and take a couple of steps back :)
Click to expand...

I was referring to the crop lenses. If you have a crop camera then the 18-35mm f/1.8 gives you 4 different prime lenses in a single package including primes that don't even exist (18mm f/1.8). You could go around with a bag containing 18mm, 24mm, 28mm and 35mm primes, but you still loose the flexibility if quickly changing perspective. Nat none of the focal lengths are the apertures really any slower by a significant about, 2/3rds at best but only compared to super expensive and heavy f/1.4 primes, even then at 18mm you have few if any choices choices.


With the 24-35mm f/2.0 you are still missing a 28mm prime for example. Taking a step back with the 35mm may not be possible and if you can then you are changing the perspective.

And weight is just the penalty for flexibility.
 
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