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Ijay37
7th March 2008, 10:10 PM
Has anyone had any experience of sigma glass in particular the 30mm F1.4 in terms of quality as compared to Oly lenses.
Regards John

blu-by-u
14th March 2008, 02:50 AM
I have the Sigma 105 F2.8, 18-50 f2.8 and the 135-400.
What I have noticed is that these are lens made for the AP-C sensors and only adapted for the smaller 4/3..hence from the charts, they are sharp throughout the range..ie, the "bad" corners do not exist on the 4/3s.

18-50
http://farm4.static.flickr.com/3004/2327868513_1b3eac0d1f_m.jpg (http://farm4.static.flickr.com/3004/2327868513_1b3eac0d1f_b.jpg)

105
http://farm3.static.flickr.com/2130/2326216118_b5bf8ef015_m.jpg (http://farm3.static.flickr.com/2130/2326216118_b5bf8ef015_b.jpg)

http://farm3.static.flickr.com/2227/2250390450_9185a87d68_m.jpg (http://farm3.static.flickr.com/2227/2250390450_9185a87d68_b.jpg)

135-400 (@ 400 end)
http://farm2.static.flickr.com/1155/1455737443_341b83823b_m.jpg (http://farm2.static.flickr.com/1155/1455737443_341b83823b_b.jpg)

j.baker
14th March 2008, 08:07 AM
I purchased the Sigma 30mm F1.4, and it went back within four hours.

It appears that a lot of people have had problems as well.

If you want to get one, try to make sure that you test it before purchasing

That said, I did have the 55-200mm and it was a good lens for the price.

HughofBardfield
14th March 2008, 09:38 AM
Sigma are frequently accused of QC problems. So far (with 55-200, 135-400 and 105 macro) I have been lucky, and have been very happy with all of them.

Some people are getting fantastic results with the 30mm on 4/3rds bodies. See here for some egs:
http://www.flickr.com/groups/sigmafourthirds/

I'm looking forward to a head-to-head with the new ZD "pancake" as the 30mm has been on my wish list for some time.

Nick Temple-Fry
14th March 2008, 06:00 PM
Sigma are frequently accused of QC problems. So far (with 55-200, 135-400 and 105 macro) I have been lucky, and have been very happy with all of them.

Some people are getting fantastic results with the 30mm on 4/3rds bodies. See here for some egs:
http://www.flickr.com/groups/sigmafourthirds/

I'm looking forward to a head-to-head with the new ZD "pancake" as the 30mm has been on my wish list for some time.

Hugh

Can you share your experience with the 135-400, it is a lens I keep thinking about getting.

Nick

Vokesie
14th March 2008, 10:16 PM
I have the 30mm f1.4 and think it is a fantastc lens, I have never had a problem with it

http://e-group.uk.net/gallery/data/512/Sirenide_27_.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/3131)

Real Ramona
9th May 2008, 02:35 PM
I have one of those lenses (its actually for sale at the mo - pm if interested)
Its very nice quality build wise. It feels better than the Oly kit lenses but certainly not on a par with the pro range, those things are in a different league really.
As it is built for use on APS cameras as well it is rather larger than you might expect for a four thirds lens, but still nicely balanced.
Imagewise it is very capable, though I feel that the pictures do not have quite the snap of those from my 14-54.
Incredible in low light obviously, and really skinny DOF when wide open!
All in all I really like Sigma. I had a few Canon FD fit lenses years ago and always got great results with them.
Cheers
J

blu-by-u
16th September 2008, 03:42 AM
Just acquired this 30mm/1.4..Took it for a spin over the weekend and here is the results..

http://farm4.static.flickr.com/3005/2861664200_d16d5b4df8.jpg

http://farm4.static.flickr.com/3241/2861665378_3c81a2592d.jpg

http://farm4.static.flickr.com/3284/2860863715_052992cacc.jpg

donmcmahan
12th July 2009, 04:29 PM
I have the 30mm f/1.4 and I love it, there is apparently some sample variation issues but I seem to have gotten a good one.

theMusicMan
12th July 2009, 05:26 PM
Oh wow blu-by-u - I love the sharpness on those images, very impressive. I might have to consider trying the 30mm f.14 lens now.

garethlovering
3rd November 2009, 09:59 PM
I am thinking about buying one of these fast lenses.

Is the 30mm = to a 60mm on a 35mm camera?
or is a 30mm = to a 30mm on a 35mm camera?
Does the 4/3 rule only apply to Olympus lenses?
Confused or what.:confused:

theMusicMan
3rd November 2009, 10:03 PM
Hi Gareth

The Oly 4/3 format yields a *2 crop factor, which essentially means that for each lens on your Oly kit, is equivalent to *2 on 35mm equivalent. So, your Oly 30mm lens sees what a 60mm lens would see on a 35mm camera.

Simply double the focal length to get the equivalent for 35mm.

However, a 30mm lens is ALWAYS a 30mm lens, regardless of what crop factor it is placed upon. All that changes is the field of view.

Maybe my thread here might help explain.

http://e-group.uk.net/forum/showthread.php?t=6812&highlight=field+view

Shout if there's anything we can do.

blu-by-u
4th November 2009, 06:15 AM
Oh wow blu-by-u - I love the sharpness on those images, very impressive. I might have to consider trying the 30mm f.14 lens now.

Yes those shots are sharp. Since then I have acquired that 25/1.4 and everything that 30 can do, the 25 did better. So I have since sold that 30/1.4.