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Old Mar 12, 2007, 6:24 PM   #1
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Okay, I bought the Tamron 28-200mm and found toomuch CA wide open for my tastes... has anyone used the Vivitar Series 1 28-210? Does anyone know if it has the same problems?
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Old Mar 13, 2007, 7:13 AM   #2
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I don't know the Vivitar lens, but it reminds me of my Voigtlaender 28-210 zoom lens:

http://www.voigtlaender.de/cms/voigt...san6m4duk.html

What do you say? Is that the lens you are talking about? If so, maybe they just re-brand the lens which originates from another manufacturer?
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Old Mar 14, 2007, 8:32 AM   #3
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Hi,

Which version did you get? Was it a film or digital version? I have the Sigma and only get some CA when shooting into High Contrast areas with the sun in the wrong position.Post an example.

Rudy
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Old Mar 14, 2007, 9:58 AM   #4
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nick,

what's the serial number?? that would help.

roy
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Old Mar 14, 2007, 11:43 PM   #5
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Film Version; Model:271D; Serial: 906373
Attached example is 100% crop, untouched. Quite soft and a good bit of CA around the nose and lips for me.

Note: This is at f/8... I can't find anyof the shots I took wide open.
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Old Mar 15, 2007, 7:18 AM   #6
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f/8... wow.

Is this at 200mm? A crop from the center or the edge? Tamron's zoom lenses tend to be only so-so in the edges... according to tests other people made.

This is no camera shake I suppose as I think there was enough light... at first I thought also "out of focus" but I guess since you get a lot of similar shots we can dump that idea right away.

Doesn't look very sharp to me... hm.

I'd check center vs. corner sharpness at different f-stops and zoom (i.e. at 28mm, 105mm and 200mm).


Can read here on a tamron review which shows that corner blurring: http://www.bobatkins.com/photography..._18_250_3.html

HTH,
Th.
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Old Mar 15, 2007, 7:59 AM   #7
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This is a 100% crop from the center of the photo. Have a lot from the zoo... all are similar in results. I will do some test shots today at different FL and f/values. No SR on the istD... but a K100 is in the verynear future .
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Old Mar 15, 2007, 9:34 AM   #8
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Hi Nick,

That is the film version. It has the 72mm front lens. First, Your focus is a little off. Second, The sun is high and more on the subject than behind you.

After playing with this example this was what I came up with. It is still not really sharp, But you could have touched up the focus manually a little.

Rudy
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Old Mar 15, 2007, 2:48 PM   #9
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OK - I had a go with sharpness in mind, that's the before-after piccie:



what I found:

- motion blur was there, only a tad, but it was more horizontal than vertical movement according to a deconvolution guess

- I can't say for sure if this is off-focus or blur from the lens. The sharpened picture seems to show a hint of DOF, but that might just be me :?

- there IS quite some detail in the lion... but it shouldn't need such a huge amount of post-processing to see it. The sharpened version already looks unnatural. :/



COMPARISON (maybe that helps a bit, too)

This is what my Pentax-FA 28-105/4-5.6 IF gives me at ISO1600 and f/5.6 fully zoomed (105mm):



This is a 100% crop, I only used a denoiser for the color noise at ISO1600. No other post-processing.

This is what the sharpening looks like for the whole picture:

- no sharpening
- medium (a lot moredetails become visible)
- maximum (at least I won't go any further - artifacts start to show up with 90% JPEG quality, butquite niceto look at from normal viewing distance on my screen - has an almost 3D-feeling to it)





Sidenote: I found fur (from animals) to look "blurry"/"fuzzy" at a lot of photos, especially if you "pixel-peep" at 100%.

Post your pics, will have a look at them, my current feelings --> you SHOULD get sharper pictures, at least now and then

Regards,
Th.
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Old Mar 15, 2007, 5:56 PM   #10
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Hi again,

I would not get the Vivitar 28-210mm lens. I had a Tokina 28-210mm lens and found it to getsoft at 210mm. It did not have the warm saturated color or contrast . The coating was not that great either.

I played a little more with the picture. Let me know what you think. Also next time try a polarizer.

Rudy

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