Sigma 28-70mm F/2.8-4 DG - my experiences & samples

Hi,

Because Sigma 28-70/2.8-4 is quite rarely seen lens here in forum, I

thought it would be useful show couple of test samples and some real life samples with it.

I bought this small lens, because I wanted something small and handy, but not so big size lens in my all-around camera bag. My trusty nikkor 35-70/2.8 is too big for that purpose and nikkor 35-70/3.3-4.5 too low quality wide open (IQ and I don't like its bokeh).
Sigma 28-70/2.8-4 is indeed a small lens...



...And it has quite simple optical construction...



But although it's simple lens it produces quite interesting and simple bokeh also, I think - a way better than example my nikkor 16-85VR, what comes to bokeh.

It's not very sharp lens (not bad though), but sharpnes is not always everything as we know ;-D

If you are interested, here are more my bokeh testing with it:
http://forums.dpreview.com/forums/read.asp?forum=1034&message=31678553

And one example what I mean:
50mm...(crops)

• Nikkor 16-85VR

f/5:

• Sigma 28-70/2.8-4

f/4:



Anyway - here are some my 'real life' shots with Sigma 28-70/2.8-4...

1. 1 - 32mm, f/4

1. 2 - 70mm, f/7.1

crop:

1. 3 - 70mm, f/4:

1. 4 - sigma 28-70 - 70mm, f/4:

...and as for comparison:
nikkor 16-85VR - 70mm, f/5.6:

1. 5 - sigma 28-70 - 70mm, f/4:

crop:

1. 6 - 70mm, f/4:

crop:

1. 7 - 70mm, f/4:

...Some close-ups..

1. 8 - 70mm, f/5.6

...works also pretty nicely with ext.tube...

1. 9 - 52mm, f/4.5 + EXTENSION TUBE (18mm):

crop:

1. 10 - 48mm, f/8 + EXTENSION TUBE (18mm):

crop:



cheers,

Ari

--

• Ari Aikomus -

'Why should I feel lonely ? is not our planet in the Milky way?'

At first - thanks for Helsinki, I love this city!

Samples are impressive, IMO. Good colours, contrast and sharpness. And I see no CAs - is it really so?

--
8
Best regards,
Sergey
http://www.photo.net/photos/Atos

Hi and thank you for kindly comments !

Sergey Skleznev said:

At first - thanks for Helsinki, I love this city!

Samples are impressive, IMO. Good colours, contrast and sharpness.
And I see no CAs - is it really so?

Click to expand...

I think that CA isn't a problem with this sigma. Its performance is pretty nice overall, except some softness particularly wide open - but nice bokeh compensate that for my purposes. I have my nikkor 16-85Vr, if I want very sharp pics.

Here are some my "CA samples" what I took today
(converted from RAW files, no PP):

1. 1 - 70mm

scene:



crops...

• nikkor 16-85VR, f/5.6:

• sigma 28-70, f/5.6:

• sigma 28-70, f/4:

***

1. 2 - 70mm (part2)

scene:



crops...

• nikkor 16-85VR, f/5.6:

• sigma 28-70, f/5.6:

• sigma 28-70, f/4:

***

1. 3 - 28mm

scene:



crops...

• nikkor 16-85VR, f/4.2:

• sigma 28-70, f/2.8:

Ari

--

• Ari Aikomus -

'Why should I feel lonely ? is not our planet in the Milky way?'