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04-04-2008, 09:08 PM   #1
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Sigma 28 f1.8

Sigma 28mm F1.8 EX DG ASPHERICAL MACRO (AF Lens) - have seen this lense in a local Shop. Has any one used - comments pros & cons welcome.

Appears to have good write ups when released in 2000.

Kevin

04-04-2008, 09:12 PM   #2
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(copied reply from another post)

I've got a Sigma 28/1.8, and loving it. The weight and size are an issue, but it's well balanced and still smaller than most zooms... just a bit bigger than you'd expect for a prime. Super sharp, 1:2.3 macro, and great IQ except for a bit of flare (a better hood would do the trick).

Samples, the last one showing bokeh:







Any other Q's, ask in this thread rather than PM so that it goes in the record. Also, most of the recent pictures from my flickr are using this lens:
Flickr: Photos from benplaut
04-04-2008, 10:22 PM   #3
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Thanks Ben - looks as though this may be my next purchase. I notice your Flickr photos mostly General Shots/ semi portraits etc, do you consider anywhere as good as your FA50/1.4

I was thinking of purchasing the Sigma for these low light situations where f3.5 onwards struggle.

thanks again Kevin
04-16-2008, 08:13 PM   #4
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Good stuff by Ben.

Also the user Darren M. has the Sigma 28/1.8 as one of his highly held lenses

04-16-2008, 10:16 PM   #5
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Just recently got a sigma f/1.8 28mm ex dg macro lens for my k10d.
Build quality is nice, but its a freaking huge lens. 77mm filters. There is actually a bit at the front of the lens that looks like a built in step up ring. It has a goofy push/pull system to engage the MF mode on the lens. The trouble being that you also have to flip the switch on the body still. I guess it makes it so the focus ring doesn't rotate during AF though. Its macro mode isn't anything special, 1:2.9 by specs. However I think you can achieve focus considerably closer than the rated 7.9 inches so that might be higher in real life. Talking about not meeting specs, my camera is reporting the max aperture as f/1.7 not f/1.8. Not a huge difference by any means, but it is a difference.



Any here's a couple images just from my first day of farting around with the super large aperture. Not great art or anything.




Last edited by Geekybiker; 04-17-2008 at 11:11 AM.
04-17-2008, 12:34 AM   #6
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Yep, it's actually a 1:2.3 and f1.7 (not sure on that one, but mine does it too), as it goes beyond what the scale says. The MF system is clunky, but it's actually a BOON when you're using hyperfocusing... just lock the ring back into AF and your focus won't move.

as for it being a huge lens.... yea. That's the price you pay

@kev: at F4 and above they're pretty much equal (ie, almost perfect). Below that, the 28 is generally a tad bit sharper, and deals with PF much better than the FA50.

Last edited by benplaut; 04-17-2008 at 12:59 AM.
04-17-2008, 02:40 PM   #7
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Thanks for your replies - still waiting for the asking price to drop. Is asking 2/3 of new price.

Kevin
04-19-2008, 01:26 PM   #8
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Well, I got around to doing more tests with this lens. Anything below f4 and it has focus issues. Below f2.8 its unacceptable. I did focus tests on a tripod, with release, center AF only. The optics seem okay as I was able to achieve considerably better focus manually than with AF wide open. Since this lens was bought mainly to be used wide open, I think I'll return it.

04-19-2008, 04:16 PM   #9
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Geekybiker, Why not just contact Sigma first.
The chances are good that you can send it into them, and have it dialed in, in a very short period of time.

At the moment Sigma USA's turn around for warranty work is fast.
I would almost be surprised if they had it for more than 2 weeks.

Plus I can almost assure you that it'll be dialed perfectly then.
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