Hi, I have been using my Sigma 18-35 1.8 with D7100 for my clothing photography for few months and I finally want to discuss about this issue. The lens would focus perfectly in Live View. However, it won't focus on the object that is further than 1 yard. I've tested my D7100 with other lens and they seemed to focus right. Therefore, this isn't my D7100 problem.
Strange thing is that Sigma 18-35 CAN focus perfectly for objects within 1 yard in both Live View and view finder focusing. It only have trouble focusing on objects outside 1 yard with view finder focusing -- Live View focuses perfectly though.
Do I need to send this in to Service Center? Or am I doing something wrong? Anyone have similar experience with 18-35?
I suggest you send yours back for a check-over.
Depending on the severity of the issue, you could try resetting the focus parameters using the Sigma USB dock ($60) or compensate for it using the D7100's AF Fine-Tune function.
The lens is phenomenal when focused right -- when using Live View that is.
It focuses perfectly and very fast for within 1 yard boundary. But further than that, its horrible.
But this weird focusing problem is driving me crazy! I use this for my work! I can't always be using slow Live View.
I understand AF calibration could be one possible problem. But this is only happening for "Far away" objects that are more than 1 yard away! Could you call this AF calibration problem too?
I tried and AF Fine-Tuning Function did not help as this happens in certain distance only. If I get the "far-away" objects to focus right, then "Close" objects are out of focus.
Could this be solved using the USB Dock you've mentioned?
That is very strange and hard to understand. If focus is not aligned, shouldn't it be same (not aligned) through out all distances?
What's the best solution for me?
Proper AF Fine tuning or Sigma USB Dock could help me do this without sending in for repair? Or repair could be a better solution?
I really enjoy this lens. It's fantastic and this is actually keeping me from switching to Full Frame... But I'm having difficult time working with this lens on Live View the whole time...
Thanks for helping!
There are tutorials out there that explain how to focus fine tune a lens. If using AF Fine Tune cannot rectify the problem, then you might need to use the USB dock, or send the lens to Sigma.
The fact that you can successfully use AF Fine Tune to make far objects in focus (albeit sacrificing close objects) confirms that it's the AF calibration settings that are off.
With the USB dock you can specify different calibration settings for four different distance zones. So in your case you can put in a different calibration for distant objects (> 1 meter to infinity). Hopefully that may solve the issue. Otherwise sending the lens back for repair is the only other option.
See video below:
I wonder how the calibration settings got messed up to begin with... you may want to reset to lens to defaults and go from there.
Being a photographer is a lot like being a Christian: Some people look at you funny but do not see the amazing beauty all around them - heartyfisher.
I see. Learning something new everyday I hope this would help others who're having trouble too.
My searching skill must be terrible. I didn't know there was video like that. Thanks a bunch!
That's what I thought too.. but nothing was attached.
I guess the better photo that I was looking for is on the actual manual but I haven't found it online yet. In the manual it shows an example if the square is bigger than the subject it may not focus correctly.
And, that is why we see so many gray lenses at the sporting events….many of the Canon shooters believe the focus is quicker on a Canon vs, Nikon pro body…… but we have the edge in sharpness overall…NPI
Since I used the lens mostly for studio work, I just used the Live View mode.
Occasionally, when I bring this lens along during my vacation, I had many blurry faces/subjects and it was quite annoying. But I still like the lens. I'm going to find out if I can get this calibrated using the USB. This lens is actually holding me back from getting a D750 right now..
I wonder why other companies aren't making 1.8 focal zooms?
Just wanted to share my experience after sending my lens to Sigma for adjustment.
In short, I have to say, I think they nailed the focus problem. There still is a very tiny focus issue, but I think that's just the limit of my D7100's non-liveview focus. It focuses as well as my 35mm 1.8 Nikon lens -- if not better.
Sigma states that their lens' are fine-tuned to fit all DSLRs out of factory, but they say every camera require slightly different fine-tuning. If you have some time, send your 18-35 1.8 to Sigma for fine tune. I think its worth it. They may contact you for your camera's model number for specific adjustment (or I might have forgotten to supply them at first place..).
Not to mention you have 3 year extended warranty if you bought yours off the shelves of authorized store! Be sure to check it!! I thought mine was out of warranty but thank goodness I've bought it from authorized store (Samy's Camera).
I wanted to move up to FX but this lens is just too brilliant to sell off...
In conclusion, after having mine sent in, it's very satisfying.