My wonderful wife has decided that this would be a great valentines gift for us! After much prodding from me.
So I am ready to order from B&H, but it just hit me that there is one thing I have never asked or remember seeing about this lens...
I have the Tamron 70-300 and it has a good amount of CA/PF in high contrast areas. Does this Tamron lens suffer the same issues? Especially since it has a larger Aperture at 2.8 thru the zoom range.

Does your copy of the lens have issues with CA/PF? Any other issues I should be aware of?
Thanks for the help.
I am looking to get a fast zoom to help catch the kids and I know I will use it at 2.8 often and I do not want to have to deal with purple fringing on the shots.

-gus-

[jgredline]

I have the lens and find it prefect really...There is not a single bad thing I can say about it...I also know what you mean about the 70-300 Tamron as I too have the same lens and same conclusion as you, but this not the case with the 28-75mm F/2.8

Thanks Javier, that is such good news. Do you use it in lowlight situations? Is it reasonably sharp at F2.8 in real world usage?

[Peter Zack]

These 2 lenses are very different optically. The 28-75 is a gem. IMO everyone who will use a zoom, should get one. As Javier says, I'd be hard pressed to find a flaw in this lens.

Buy it without worry.

Thanks Peter, I will click send on the order then...
Much appreciated.

[Peter Zack]

It is indeed sharp wide open and at both extremes but is better 1 stop down and back a bit from each end. But that's true of any zoom I've owned or ever read about. They always are a little sharper stopped down and a little softer when at each end.

[jgredline]

It is indeed sharp wide open and at both extremes but is better 1 stop down and back a bit from each end. But that's true of any zoom I've owned or ever read about. They always are a little sharper stopped down and a little softer when at each end.

Yep, that is exactly what I have found and it really is great in low light.

[Tingchaleun]

I second the opinions of jgredline and Peter Zack. Nothing negative to say about the lens. My lens, i think, is sharp straight from f/2.8 through. As for aberassions, nothing significant that i have ever noticed - at any focal lengths or aperatures.

Few lenses seem to have such support and few detractors...

Your time is much appreciated.

[Lowell Goudge]

I was using my 28-75 Di f2.8 today under perfexct purple fringing conditions, kids in multi colored snow suits playing in a snow bank under clear skys in briught sunlight.

I'll be dammed if I can see any CA at all.

This is a really great lens.

[Duh_Vinci]

Nothing more to add to what was already said... I actually use this lens very often wide open, and beyond happy with results.

Regards,
D

[pentkon52]

Thanks Javier, that is such good news. Do you use it in lowlight situations? Is it reasonably sharp at F2.8 in real world usage?

I had to return mine. It was fantastic from F5.6 up, but a real mess from F4 to F2.8

I'm told this is rare and have seen some nice photos using the lens.

Dave

[Duh_Vinci]

Dave,

Yes, I remember, very very unusual, shame, but I guess bad copy does slip-in occasionally...

Here are few test shots with this lens wide open, shot in raw, converted with Pentax supplied software, resized in CS2/3, all settings at "O" and no post sharpening (all at f2.8 ISO 800, full exif should be intact):







Regards,
D

[jgredline]

Dave,

Yes, I remember, very very unusual, shame, but I guess bad copy does slip-in occasionally...

Here are few test shots with this lens wide open, shot in raw, converted with Pentax supplied software, resized in CS2/3, all settings at "O" and no post sharpening (all at f2.8 ISO 800, full exif should be intact):


Regards,
D

Nice, Very nice!!! and awesome Bokeh!