Sigma 50mm f/1.4 EX DG HSM -SIGMALUX-

kaigraphy wrote in post #9735273
I just got my copy...no time to test it for focus problem...I already know about the AF problem b4 I bought the lens and judging from the amount of AF problem on sigma...I wouldn't be surprise my copy have it to and since I'm not from USA sending my lens to sigma is a no no...I do however think I have the latest copy...my serial starts with 105xx

I only hope my lens is good...if not I'll just MA it on my 7d...any of you guys using the lens on MA...just wondering???

-10 here. My has a slight back focus issue. You should do a focus test so that you know how much MA you need.

hungxpsi wrote in post #9731525
Hello All,

I hope I'm posting this in the appropriate thread. I just received my copy of the Sigma and it seems really soft wide open. I'm not sure if it's a dud or if I'm just expecting too much from a 1.4 lens. Once past 2.8, it seems to sharpen up nicely, but so does my 50 1.8. All testing was done on a tripod using a shutter release, manual focus, and 10x live view magnification. Shot using RAW and no post processing was done. Focus point was on "DK" in Redken.

since you're using mf...I think that's normal...but I could be wrong...

hungxpsi wrote in post #9731819
I agree that my copy of the 1.8 is already quite sharp, so it's hard to improve much on it. I will take your advice and send it in since I feel it has slight front focus too. Thanks!

BTW, beautiful hospital shot!

Do a bokeh comparison with the 50 1.8 (the Sigma will smoke the Canon), then take some real life shots with the Siggy - you will then realize why you bought the Sigma.

f/1.8...

TooManyShots wrote in post #9735350
-10 here. My has a slight back focus issue. You should do a focus test so that you know how much MA you need.

In MFD? There's a bunch of info missing here. Also your focus plane with any lens will typically be biased towards the front a bit.

I have three copies: +5, +3, and 0 MA.

kaigraphy wrote in post #9735273
any of you guys using the lens on MA...just wondering???

I love this lens. AF seems to be faster under AI Servo mode than under One Shot mode. My niece first birthday turning 1. All of these shots I had to turn down contrast from 2 to 1 or to 0. Sharpening at 5 the most in DPP.

IMAGE LINK: http://www.flickr.com/​photos/vracing/4409655​121/

IMAGE LINK: http://www.flickr.com/​photos/vracing/4410421​982/

IMAGE LINK: http://www.flickr.com/​photos/vracing/4409655​355/

Did a focus test...results are mix..need feedback from you guys...

here's the focus test pic...summary first...took a print screen so all three test can be compared at 100% crop... full version below. All test done on tripod, wide open f1.4, 10 second delay and no flash, camera is 7d using spot AF, show in raw and converted in dpp with no additional special settings...

I've never really looked at 7D files so it is tough to say but it looks pretty good to me. The green/purple fringing front to back is LOCA (longitudinal chromatic aberration) and is common to most fast lenses. Only very expensive (read: Leica) lenses labeled APO (for apo-chromatic) tend to reduce LOCA.

http://toothwalker.org​/optics/chromatic.html

Looks like it's misfocusing. Isn't fringing a sign of misfocus? That's what I've noticed with my 'Lux when I was trying to MA before sending it in.

richierich1212 wrote in post #9741586
Isn't fringing a sign of misfocus?

Not always. It's tough to call these images. My advice is try a flash on the eye of someone sitting still. Start at f/1.4 and work you way to f/2.8 in 1/3 stops. A flash is also helpful.

It looks OK to me.

A nice little nap...

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that's an adorable shot!