Purple Fringing

[Marko]

I see it now. Thx.
.....and i would definitely never use that lens again if it were mine. You just never know where the fringing will show up and that would freak me out.

[jjeling]

I see it now. Thx.
.....and i would definitely never use that lens again if it were mine. You just never know where the fringing will show up and that would freak me out.

No kidding. Not reliable at all. It was one of those el cheapo tamron's. I couldnt have spent more than $200 on it. It is a 70-300mm with a macro function. It is great under extremely specific conditions. That is about it. If those conditions are not right, then the lens stays off. The macro function is nice to have. It is more of a practice lens though. The only real images that have ever come from this were the images of the iguana's.

It is extremely weird. I pull the same shutter speed at f5.6 and f45 at at any given focal length. I need more light at f11-f25 than other aperture settings. Its a toy more than anything and could care less if I dropped it and it broke.

[Marko]

Sounds broken to me, let's wish it fairwell then..if possible:cry-an:

[Mad Aussie]

That's a nice case of chromatic aberation you got there JJ. All lenses suffer from it to some degree I think but it's more obvious in cheaper lenses. It occurs at the borders of very bright pixels where they meet dark pixels.
Shoot in RAW if you think this will happen and use the RAW editing software like Lightroom or whatever to correct it where possible.

[Marko]

I agree with this MA but

"It is extremely weird. I pull the same shutter speed at f5.6 and f45 at at any given focal length. I need more light at f11-f25 than other aperture settings. Its a toy more than anything and could care less if I dropped it and it broke."

this lens ALSO sounds broken.

[Mad Aussie]

I agree with this MA but

"It is extremely weird. I pull the same shutter speed at f5.6 and f45 at at any given focal length. I need more light at f11-f25 than other aperture settings. Its a toy more than anything and could care less if I dropped it and it broke."

this lens ALSO sounds broken.

Oh yes, I wasn't arguing that something wasn't wrong with the lens. Just stating what that effect was.

[Mad Aussie]

I should add that the fringing was immediately obvious to me on my screen.

[Alex Wilson]

It really shows up on my monitor -- not just around the hat, but around the head of the club too. Definitely avoid that lens if you're shooting anything bright.

[F8&Bthere]

I'm a bit late to the party, but FWIW...

This ties in nicely to my complainin' about Pentax lens price increases in another thread. Pentax has it's fair share of CA problems. Just check out reviews at photozone.de

I see some purple fringing in your photos and I also see it in many of my photos with certain lenses. I tried correcting it in lightroom but often it's too much for the LR CA correction tool even. Other programs like DXO Optics and PTLens do these kind of lens corrections as well, but I think DXO won't have presets for as many Pentax body/lens combos as for Canikon. PTLens may be better from what I've read in the Pentax forums.

I never tried the Pentax/Silkypix software long enough to see if it offered any lens corrections. Might be worth a try, since you prob already have that software for free. Look for some tool or adjustment called Chromatic Aberration.

[Barefoot]

I see some purple fringing in your photos and I also see it in many of my photos with certain lenses. I tried correcting it in lightroom but often it's too much for the LR CA correction tool even.

There is a fairly quick fix in PS if it’s not real bad. This image is borderline as the head of the club can be salvaged, but the area around the cap is a little tougher. There is still remnants of CA visible there.

Image>adjustments>hue/saturation. Select magentas from the edit box and place the eye dropper over an offending area of the image and click. Slightly decrease the hue and drop the saturation until the purple disappears. It's a global adjustment, so no matter where you choose to place the eye dropper, the effects of CA should disappear through out the entire image. You may have to use the magnification tool to get a good placement of the eye dropper on the purple fringe. Sometimes you have to select blues in the edit box as an additional step, but separately.

This method does not eliminate the border occupied by the effects of CA, but it does make it much less noticeable.