Sigma lens - all need calibration?

yeekhai · 30th March 2009

bought sigma 10-20 and 28-70 f2.8, send for calibration due to focusing issues at different focal lengths.
talked to the nice technician, was wondering why cant all lens checked before selling. The answer : lens need to be calibrated to body. different body may have to recalibrate, dont quite understand all these. anyone can enlighten me?

Snoweagle · 30th March 2009

Originally Posted by yeekhai

bought sigma 10-20 and 28-70 f2.8, send for calibration due to focusing issues at different focal lengths.
talked to the nice technician, was wondering why cant all lens checked before selling. The answer : lens need to be calibrated to body. different body may have to recalibrate, dont quite understand all these. anyone can enlighten me?

I've never calibrated any of my lens or bodies cos they are worked perfectly. If yours always need calibration, there might be a problem.

yeekhai · 30th March 2009

sorry, he mentioned DOF thing, at f2.8 and close range, the front/back focusing issue is more obvious. for f5.6, not serious... mine r new one. tested myself at few focal length wide open, pictures taken all not sharp, so send for calibration.

godzilla60 · 30th March 2009

Originally Posted by yeekhai

sorry, he mentioned DOF thing, at f2.8 and close range, the front/back focusing issue is more obvious. for f5.6, not serious... mine r new one. tested myself at few focal length wide open, pictures taken all not sharp, so send for calibration.

how long does the calibration take? do we need to leave the lens with them?

yeekhai · 30th March 2009

my 2 lenses send in with camera at 10 am, collected at 2.pm..

godzilla60 · 31st March 2009

thanks!

will be taking my 24-70 for finetuning...

eosandy · 31st March 2009

Originally Posted by alan24

nope. just book an appointment. He will do it on the spot. Takes around an hour. u get back your lens on the same day. I thought sigma singapore in this regard is fantastic. it is pretty painless to calibrate a sigma lens in singapore so that is why I am not so afraid of focusing issues of sigma lens.

Do you notice a difference, and what was the cost per lens?

I have a 10-20 about 18-months old, noticed it's a little soft and your comments here are making me think it's a good idea to calibrate.

eosandy · 31st March 2009

Originally Posted by eosandy

Do you notice a difference, and what was the cost per lens?

I have a 10-20 about 18-months old, noticed it's a little soft and your comments here are making me think it's a good idea to calibrate.

Originally Posted by alan24

10-20mm??? that one usually no need to calibrate as it is an ultrawide. Make sure you have a focusing error fisrt b4 going down. dun waste people's and your time.

I calibrated my 30mm f1.4. it has serious front focusing at f1.4. It is very soft at f1.4. usuing manual focus, I realised the pics are so much sharper so I sent it in for calibration.

cost is FOC if under warranty.

I believe my 10-20 has a focus issue with my cam body. I will let Sigma determine if it's within specifications, and if it needs work I will need to pay so they make money!!!

Good to hear your prime is much better.

yeekhai · 31st March 2009

Originally Posted by eosandy

I believe my 10-20 has a focus issue with my cam body. I will let Sigma determine if it's within specifications, and if it needs work I will need to pay so they make money!!!

Good to hear your prime is much better.

my 10-20 no issue at 10, but got some problem at 20. i use nikon 18-105 at 18mm, and f5.6 and compare to sigma at 18, f5.6, sharpness r quite obvious - so send for calibration at confirmed lens got issue. anyway, not sure whether that is correct method to compare, or juz by luck

Omega23 · 1st April 2009

I thought i heard somewhere that they do calibration for free even if the lens's warranty over?

Snoweagle · 1st April 2009

Originally Posted by Omega23

I thought i heard somewhere that they do calibration for free even if the lens's warranty over?

That's only if it's a known problem in the whole batch or series during manufacture.

eosandy · 1st April 2009

Originally Posted by Omega23

I thought i heard somewhere that they do calibration for free even if the lens's warranty over?

Quote from email back from Sigma discussing out-of-warranty 10-20.
There’ll no cost & you can wait while the technician do the calibration.

koolcat · 1st April 2009

always calibrate my lens to the body. and if have two bodies.. just have to calibrate them both. yes. there is a difference.

KC Eng
www.kcengphotoraphy.com.sg

londonbridge · 1st April 2009

For cameras like the 50d with the af fine adjustment function, does it mean can just do the adjustment on body? Or need to send down also to let tech calibrate?

ice15 · 5th April 2009

where did you have your lens calibrated?

Is there a Sigma Service Center here in Singapore?

Snoweagle · 5th April 2009

Originally Posted by ice15

where did you have your lens calibrated?

Is there a Sigma Service Center here in Singapore?

Yes.

Sigma Marketing (Singapore) Pte Ltd
3791 Jalan Bukit Merah #07-19/20
E-Centre @ Redhill
Singapore 159471

ice15 · 5th April 2009

Originally Posted by Snoweagle

Yes.

Sigma Marketing (Singapore) Pte Ltd
3791 Jalan Bukit Merah #07-19/20
E-Centre @ Redhill
Singapore 159471

thanks!

yeekhai · 5th April 2009

Originally Posted by ice15

thanks!

the calibration is solely by appointment, pls call them to arrange.

Snoweagle · 5th April 2009

Originally Posted by ice15

thanks!

No probs! Typed exactly according to my warranty card.

ice15 · 5th April 2009

(I also posted this question on another thread)

Do they have a machine to check if the lens is not calibrated?

Or do they just try to shoot a chart while the lens is mounted to your cam?

can they calibrate the lens to work perfectly with 2 (or more) cams?

30th March 2009	#1
yeekhai Member Join Date: Feb 2009 Location: Bukit Batok Posts: 85	Sigma lens - all need calibration? bought sigma 10-20 and 28-70 f2.8, send for calibration due to focusing issues at different focal lengths. talked to the nice technician, was wondering why cant all lens checked before selling. The answer : lens need to be calibrated to body. different body may have to recalibrate, dont quite understand all these. anyone can enlighten me?

30th March 2009	#3
yeekhai Member Join Date: Feb 2009 Location: Bukit Batok Posts: 85	Re: Sigma lens - all need calibration? sorry, he mentioned DOF thing, at f2.8 and close range, the front/back focusing issue is more obvious. for f5.6, not serious... mine r new one. tested myself at few focal length wide open, pictures taken all not sharp, so send for calibration.

30th March 2009	#5
yeekhai Member Join Date: Feb 2009 Location: Bukit Batok Posts: 85	Re: Sigma lens - all need calibration? my 2 lenses send in with camera at 10 am, collected at 2.pm..

31st March 2009	#6
godzilla60 Member Join Date: Nov 2005 Location: North Posts: 1,029	Re: Sigma lens - all need calibration? thanks! will be taking my 24-70 for finetuning... __________________ G

1st April 2009	#10
Omega23 Member Join Date: Mar 2009 Posts: 335	Re: Sigma lens - all need calibration? I thought i heard somewhere that they do calibration for free even if the lens's warranty over?

1st April 2009	#13
koolcat Member Join Date: Oct 2003 Location: Singapore, London Posts: 88	Re: Sigma lens - all need calibration? always calibrate my lens to the body. and if have two bodies.. just have to calibrate them both. yes. there is a difference. KC Eng www.kcengphotoraphy.com.sg

1st April 2009	#14
londonbridge New Member Join Date: Jul 2008 Posts: 28	Re: Sigma lens - all need calibration? For cameras like the 50d with the af fine adjustment function, does it mean can just do the adjustment on body? Or need to send down also to let tech calibrate?

5th April 2009	#15
ice15 Member Join Date: Jan 2009 Location: Singapore Posts: 146	Re: Sigma lens - all need calibration? where did you have your lens calibrated? Is there a Sigma Service Center here in Singapore?