Sigma Mini Wide 28mm F2.8 Lens Reviews - Sigma Lenses (2025)

If you want a 28mm F2.8 and see a Sigma version 2, that might be even better than this one. If you see one of these version 1, chances are it will be cheap enough to be worth buying. I find it good enough for a 28mm lens but there are better ones as evidenced by the Pentax 28mm F3.5.

My first image taken with this lens and a crop to show colour and sharpness in good light.

• Older one with narrow font on name plate and serial numbers appeared to start with 2 and 3.Just my observation, I do not know exact cut out number. These lenses are inferior, huge CA and often uncleanable haze to the glass. My advice is to avoid those. Top left picture. Any Vivitar is better than this one.
• Newer one, with wide font on name plate. These are the greatest. Very easy to service. All of them I had got flawless after full internal cleaning. Serial numbers appeared to start with 4. Look for those. I'm yet to find another 28mm under $50 that is as good. Top right on the picture. If you attempt to clean one - be aware that 3 rear elements all held by single nut and bunch of spacers. Once unscrewed - it all falls out. Be careful to register orientation of elements. It is easy to flip them and you will have headache to find the right order.
• And to the bunch, just to compare, Mini Wide II. If you can get one clean - you are lucky. These are very good performers, BUT they are pretty much unserviceable. Though lens appeared to be metal on the outside, optical assembly barrel is plastic and some lens nuts are plastic as well. Everything welded together with solvent or glue. Even rear nut which is metal is smudged in glue. soaking this lens in solvent is out of the question. I will be no longer pursuing those, not worth the trouble. Even if you get clean one and it get moldy later - it's a goner, I think.

Pictures below are from latest eBay listings and I did not purchase those exact once. I hope nobody object to use of those images?

ORIGINAL REVIEW:
The following info is mostly for those who will look to purchase old Mini-Wide in unknown condition. Sharing my experience. Yours may vary.

From gathering info about it, this lens appeared to be better than most 28MM. I was hunting it for a while. Got 2 of them, both original, not v2. Apparently there is typical problems with them to be aware off.

First test reveal that both lenses are hazy. It was rear surface of front doublet, second group accessible from the front. Both of them. Front surface on third group is clean and pristine. Go figure?
Interesting note: I think first lend had much worse lateral CA in the corners than second one. It was hazy but clear enough to see that. I can hardly imagine what can cause such CA difference in those copies?

Back to haze: difference was that in first lens haze has dried. In second it appeared as micro droplets that still wet. This is clearly visible from the back with bright front illumination. When cleaning first lens with alcohol or acetone those hazy spots flaked off leaving micro craters on glass. Glass looks clean and in good shape when wet. As it dries - haze returns. It took high magnification microscope to realize that glass is pitted and damaged irreparably. I'm guessing that coating has pure metal in it that corroded and pulled glass with it. Just a guess.
Better luck with second lens. Haze was on the exactly same surface, but appeared as oily micro beads. Once again, front of third group, in the same cavity as front doublet, is perfectly clean. Cleaning doublet with acetone return lens to perfect condition.

It took me a wile to figure out how ot take it apart: Turn focus to macro, this will expose set screw. Use jewelers screwdriver to unscrew it. Then you may unscrew whole rim by bare hands. After that there is access to glass nuts. No slots for spanner in those, so you need rubber grip to go deeper. No other tricks. Takes one minute to get to front doublet.
Careful with cleaning, edge paint easily thinned by either, alcohol or acetone. Don't get edge wet.

Even though one lens is damaged beyond repair, I will keep it as spare for the front and rear glass.

After cleaning second lens haze completely gone. No halo or glow.

Working lens is beautiful, sharp and contrasty, minimal wide angle distortions.
It is prone to internal reflection flare when shot against pointy light source, not too bad.

Very nice lens, if yo can get one in good shape.

Good luck!

Sigma Mini Wide.28mm, wide open (2.8)

1:1 crop

Wide open. Focus on the center horizon (Empire State Building). Lateral CA really good on this copy!

I shoot video as well, and I normally use it when I want to create a dreamy yet hazy feel.