Is this as sharp as Sigma 50/1.4 gets at 1.4?
/forum/topic/1067789/0

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LocoPhoto
Registered: Feb 22, 2008
Total Posts: 209
Country: United States

Hey everyone,

Straight to the point, I'm buying a Sigma 50/1.4 and was sent this sample from the lens.

Is this top notch quality from a Sigma 50/1.4 or is this a soft copy? Looks a little soft to me compared the same sample at f8, have heard of many getting razor sharp results at 1.4, but not sure what in reality that means compared to the sample I have below.

Your input greatly appreciated, and thanks sincerely for your help.

Jay



LocoPhoto
Registered: Feb 22, 2008
Total Posts: 209
Country: United States

Here's the f8 sample, both images 100% crop, unsharpened.

Thanks again,

Jay



mttran
Registered: Nov 03, 2005
Total Posts: 6529
Country: United States

I see some hands motion but its sharpness look good on both samples



droopy1592
Registered: May 26, 2008
Total Posts: 652
Country: N/A

looks good to me, it's probably the slow shutter speed



wickerprints
Registered: Nov 04, 2009
Total Posts: 4736
Country: United States

Now I'm not saying that there is or isn't any camera shake in the sample images, but it doesn't seem to make much sense to say that a shot at 50/1.4 @ 1/80s would be blurrier primarily due to camera shake compared to a shot at 50/8 @ 1/30s. To me, the most reasonable conclusion to draw between the sample images at the given exposure settings is that most of the difference in sharpness is due to the relative performance of the lens between f/1.4 and f/1.8.



TeamSpeed
Registered: Dec 17, 2005
Total Posts: 1817
Country: United States

Slap some more light on the subject, and get something different than a printed box. Those don't make for the best "is my lens sharp" test subjects.

Go get a fuzzy toy or something.



dfresh
Registered: Feb 13, 2005
Total Posts: 2710
Country: United States

Looks good to me, although maybe a tad misfocused or blurred from the shutter speed. You probably want to spend more time testing focus accuracy (so you can MA) rather than sharpness.



timbop
Registered: Dec 29, 2005
Total Posts: 6308
Country: United States

Seems odd that wide open the lens is softer than stopped down

</sarcasm>



Mike1.6
Registered: May 24, 2005
Total Posts: 1424
Country: United States

timbop wrote:
Seems odd that wide open the lens is softer than stopped down

</sarcasm>





My copy is great at 10-15 feet @ f/1.4. It is not as great outside of those ranges.

It is what it is.



Bruce Sawle
Registered: Sep 26, 2006
Total Posts: 4159
Country: United States

Not sure there is much to complain about. The lens looks good at 1.4. No lens will be as good at f1.4 as it will be at f8 so it's not a valid comparison. If you haven't sharpened the photos any add a little and it will be even better.



Fred Relaix
Registered: Jan 09, 2007
Total Posts: 1032
Country: France

The sigma is good at f/1.4, but nowhere as good as a 35L or 85L for instance. It gets much better by f/2 and outstanding from f/2.8. It is better than the Canon f/1.4 (including contrast at f/1.4-2), but again not by a huge margin (except bokeh, but this is not what you asked). Anyway, as said before, you need to get better sample pictures than these to conclude something.



LocoPhoto
Registered: Feb 22, 2008
Total Posts: 209
Country: United States

Thanks everyone, was hoping to check my post and find some help, grateful to each of you, the sarcastic included.

I was looking at them late at night, pretty tired, and just couldn't come to a hard conclusion on them, thinking the 1.4 definitely looks good compared to an average 1.4 lens, or older 1.4 lenses, but I want very close to the best copy of the Sigma as I can get, so I thought I'd reach out for help.

I've asked for another set of pics shot at 125th/sec or higher, and of subject matter that is 3D, like a cat or a floral arrangement. Hopefully they look really good.

I'll post the new set when they arrive for everyone's review, and thanks again sincerely.

Jay



Fr3d
Registered: Nov 29, 2008
Total Posts: 292
Country: Germany

I assume these are center crops. My Sigma 50 1.4 looked nearly identical to yours around the letters "Graphics".



scalesusa
Registered: Sep 02, 2008
Total Posts: 2336
Country: United States

Was it manually focused or autofocus? What was the distance?

These things will affect the sharpness.



LocoPhoto
Registered: Feb 22, 2008
Total Posts: 209
Country: United States

Yes, they're center crops, and camera was on a tripod when these were taken I just learned.

Ok to pull the trigger I think?

Anybody have a Sigma 50/1.4 that is just noticeably sharper? Hoping to hear from someone that has a copy that is toward the top end of what this lens can offer.

Thanks again everyone, very much wanting to get a good copy of this lens, and then an 85L to complement it.

Jay



reno.peterson
Registered: May 13, 2009
Total Posts: 3076
Country: United States

I have the Sigmalux 50 f/1.4 also, and have always been pleased with it. I did MA on it the other night for my 7D after having it for about a year, and WOW...



TeamSpeed
Registered: Dec 17, 2005
Total Posts: 1817
Country: United States



Full size: http://teamspeed.smugmug.com/Church-and-Family/The-Kids/9350014_5BW4gD#1452550786_MLRTrxN-O-LB



Full size: http://teamspeed.smugmug.com/Church-and-Family/The-Kids/9350014_5BW4gD#808059409_i5wdw-O-LB



Full size: http://teamspeed.smugmug.com/Church-and-Family/The-Kids/9350014_5BW4gD#812716853_SULVB-O-LB



LocoPhoto
Registered: Feb 22, 2008
Total Posts: 209
Country: United States

Thank you TeamSpeed!

I'm not on a computer that has any way of looking at the EXIF, any chance you could update me on the basic specs?

I'm guessing a crop camera, but want to be sure they were shot at 1.4? Depth of field sure says so, but I'm new to a lens like this so I don't want to trust my judgement on this one.

You're Blessed if those are your kids.

Thanks sincerely for those samples, makes the samples I provided look soft to me, but hopefully the next set of samples I'm being sent will be of subject matter that has eyelashes so I can compare like for like. Don't see how the next set could look as good as these you provided though...

Thanks again, TeamSpeed, truly appreciate taking the time,

Jay





trumpet_guy
Registered: Jun 23, 2006
Total Posts: 3491
Country: United States

I think the f/1.4 shot is a little misfocused.

I'd suggest doing some searches in the Alternative forum two to three years back.
There were many, many posts back then about bokeh, sharpness, and
autofocus accuracy. This thread is particularly noteworthy:
http://www.fredmiranda.com/forum/topic/661966

My obsolete site on pbase has lots of photos at f/1.4
http://www.pbase.com/tswen/sig50af

Regards,
Tim



jj_glos
Registered: Apr 11, 2010
Total Posts: 1141
Country: United Kingdom

I enjoy using mine. I wouldn't say it was razor sharp wide open, but then I have come to realise that "razor sharp" varies considerably from person to person!


Jennie by jj_glos, on Flickr


Edit: The shot above is actually at f2.0, this one is wide open though:


Jennie by jj_glos, on Flickr


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