Just ordered a 10-20mm :D

foodpoison

foodpoison

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Very excited indeed, considering I'm going to the alps in 2 weeks :D

Now to sit eagerly at the door waiting for postie :D

Just a few concerns.
Heard a lot about Sigma having quality control issues at the moment.
Is there any way I can test it for sharpness to see if I've got a bad copy?
 
Congrats. I've been tempted by one of these myself :D

Where did you order from / how much?
 
Onestop digital at £249.99

I've been playing with it at work for the past few months, and looked at it previously.
Finally bit the bullet and bought it today, with the justification that its not a temporary lens (like the 70-300 until i can afford something better) and that buying it now will save me money in the long term :D

Obviously that justification is a load, but hey ho :D
 
foodpoison said:
Heard a lot about Sigma having quality control issues at the moment.
Is there any way I can test it for sharpness to see if I've got a bad copy?
Click to expand...

The main recurring problem with lens is softness in one quadrant whilst the others are relatively sharp. Shoot some thing like a brick wall straight on and then take 100% crops of each corner of the image and compare the sharpness. Of course, they should all look the same but the common problem is that one will look a little OOF.

Good luck, the odds are slightly in your favour.

Bob
 
So about 55% chance of getting a good copy then :P

Cheers for the info, thats something to take on board. Thankfully, opposite me is a plain brick wall.
How far should I stand away?
Surely, depending how far away it is, it wouldn't ALL be in focus? :thinking:
 
That quad problem was supposed to have been in early models 9cant remember the number is has to be over to get a good copy)
 
Try a range of shots at different F stops and different distances etc. I didnt test mine when I got it and it really is quite soft :( especially wide open! Low light with my 10-20 is a big no no - I would set it up on a tripod infront of that brick wall and just fire off a load of shots, then even if you are happy with its sharpness in general you will have an idea of which are slightly softer than others etc.
 
And if it is a dodgey model, then i would suggest standing the minimum focussing distance of the lens from the wall 0.24 m i think, and bang your head against it in frustration.

Good Luck!

JB
 
Jimmy_Lemon said:
Try a range of shots at different F stops and different distances etc. I didnt test mine when I got it and it really is quite soft :( especially wide open! Low light with my 10-20 is a big no no - I would set it up on a tripod infront of that brick wall and just fire off a load of shots, then even if you are happy with its sharpness in general you will have an idea of which are slightly softer than others etc.
Click to expand...

I know its quite soft in general. Doesn't really bother me that much, because I intend on using it mainly for sweeping landscapes, when I don't intend on cropping.
I just hope its not overly soft, i.e. broken :p

I would presume the lens performs better with higher f/stops?
 
krazy_horse said:
And if it is a dodgey model, then i would suggest standing the minimum focussing distance of the lens from the wall 0.24 m i think, and bang your head against it in frustration.

Good Luck!

JB
Click to expand...

:lol: :bang:
 
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