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View Full Version : C/Y Sigma 28-70/2.8 Video Test



Nisse-Tuta
08-21-2014, 03:45 PM
Bought cheapish zoom just for fun and had some time to test it tonight.
I used the BMPCC in film mode and the BMPC4K in video since I was also comparing it to a Canon 24-105/4.
The sun is almost set so its not exactly bright.


https://www.youtube.com/watch?v=j9atP2ecYhA

Here is a quick test to compare sharpness, both are shoot in 4K Raw, f5.6, 5000K.
I have opened both in ACR, left the white balance alone but pushed auto in basic settings. Then I have aded unsharp mask to half of he sigma image and saved them both as jpegs.

Canon 24-105/4 L
10236

Sigma 28-70/2.8
10237

10235

jsolterbeck
08-21-2014, 05:16 PM
Thoughts? Looks quite sharp to my eye. Always looking for zoom options for the BM4K, thanks for posting.

Nisse-Tuta
08-22-2014, 01:08 AM
Thoughts? Looks quite sharp to my eye. Always looking for zoom options for the BM4K, thanks for posting.

Im a bit undecided. It looks ok, not as Sharp as the Canon but that is ten times more expensive if you buy it new.
The 24-105 has been my goto lens for a long time but on the BMPC4K f4 is a bit slow so I need something else.
If I start liking this lens I will keep it and get the 18-35 and a 70-200. Because lately I find myself shooting tele or kind of wide, rarley in between.

stier
08-22-2014, 10:24 AM
The in-focus areas, if you can find them, look not sharp enough for downscaled 4K. The lens should actually be able to do that. Even my old Sigma 18-50 2.8 does!

Nisse-Tuta
08-22-2014, 10:40 AM
The in-focus areas, if you can find them, look not sharp enough for downscaled 4K. The lens should actually be able to do that. Even my old Sigma 18-50 2.8 does!

I can make a test comparing sharpness and upload stills because youtube really did a number on this one, but it will have to wait untill next week.

Nisse-Tuta
08-23-2014, 07:58 AM
I just updated my first post with a quick comparison in sharpness, sorry but I have no charts or anything so I just grabbed the first thing I saw.

Nisse-Tuta
08-25-2014, 02:15 PM
Speaking of sharpness ;) I used the lens for this video,


https://www.youtube.com/watch?v=NI3V7wJ8Pgo