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New Contributor
Posts: 4
Registered: ‎09-15-2017

Tamron Lense Distorts Colors

[ Edited ]

I just bought a new Canon XT7i and a brand new tamron 16mm-300mm f/3.5-6.3 (B016E). However, when I use the range of 16mm-22mm or so, it distorts the color of the image. Everything has a red/green outline. But if I zoom in past 22/25mm, it works perfectly fine. It is really annoying not to be able to use the full range, part of the reason I bought it in the first place. Same f/stop, ISO, and shutter speed, just different focal range.

Is it the lense, camera, or user error? It does the same on video. (Example photos attached below in reply, two distorted, and two zoomed in and not distorted)?

New Contributor
Posts: 4
Registered: ‎09-15-2017

Re: Tamron Lense Distorts Colors

20170909162600_IMG_0731.JPG20170909162546_IMG_0730.JPG20170909162534_IMG_0729.JPG20170909162522_IMG_0728.JPG

Honored Contributor
Posts: 5,604
Registered: ‎08-13-2015

Re: Tamron Lense Distorts Colors

[ Edited ]

It appears to be the lens, and it is called chromatic aberration.  It might be correctable in post, but Canon's software does not correct third party lenses.  The lens covers a focal range that far exceeds 10:1, which [means] compromises were made in the design..  

You do not get that range of zoom without paying a price.  The best zoom lenses cover a focal range a with a maximum ration of 4:1.  Some of the absolute best are less than 3:1. 

 

[EDIT]. You have found issues at the short end.  Do not be surprised if you find similar issues at the long end.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Honored Contributor
Posts: 5,604
Registered: ‎08-13-2015

Re: Tamron Lense Distorts Colors

If you are not 100% satisfied with the lens, send it back for a refund.  One lens cannot do it all.  Invest in a Canon EF 70-200mm f/4L USM, for a similar price.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Esteemed Contributor
Posts: 4,431
Registered: ‎11-13-2012

Re: Tamron Lense Distorts Colors

Test report from DP Review

 

IMG_0752.PNG

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472
VIP
Posts: 8,234
Registered: ‎12-07-2012

Re: Tamron Lense Distorts Colors

It is a poor lens at best.  I would return it today. I love lenses and have way more that I should but I would never even try this lens. Let alone buy one.  Zooms that zoom more than 1 to 3 or 4 times are usually not the best.  They are for convenience not IQ.

You have a very nice camera, why put such a crappy lens on it?  

A lot of Canon stuff. Along with, a lot of other stuff.
New Contributor
Posts: 4
Registered: ‎09-15-2017

Re: Tamron Lense Distorts Colors

I do have better lenses, I was trying to get one lense for when I am back packing around other countries, I don't have to worry about packing four different lenses.
New Contributor
Posts: 4
Registered: ‎09-15-2017

Re: Tamron Lense Distorts Colors

Thank you
Honored Contributor
Posts: 5,604
Registered: ‎08-13-2015

Re: Tamron Lense Distorts Colors

[ Edited ]

jmccarty85 wrote:
I do have better lenses, I was trying to get one lense for when I am back packing around other countries, I don't have to worry about packing four different lenses.

If you have the Rebel T7i, then the Canon camera kits that I have seen come with a EF-S 18-55mm f/3.5-5.6 IS STM lens, which is very good lens for walking around like a tourist.  That lens alone, should be adequate.  

 

But, you may want something with a wider aperture for indoor shots, or a lens with a wider field of view to grab entire scenes in close quarters.  I would suggest the "Canon Portrait Kit", which includes the EF 50mm f/1.8 STM lens, and the EF-S 10-18mm f/4.5-5.6 IS STM lens.  

Another item to consider would be an external flash.  The built-in flash is fairly weak, and has an effective useful range of about 10 feet.  Light drops off significantly beyond 12 feet.  The built-in flash can also be a drain on the camera's battery, when used a lot.  An external flash would have greater range, and use its' own battery.  

Speaking of batteries, buy a spare battery, or two.  Figure out how you're going to recharge them before you leave on your trips.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
VIP
Posts: 8,234
Registered: ‎12-07-2012

Re: Tamron Lense Distorts Colors

" I was trying to get one lense for when ..."

 

Don't we all?  Trouble is IQ and large zoom ratios are at opisite ends of the scale.  One or the other.  Take your choice.

 

The best choice for you is the Canon EF-S 17-55mm f/2.8 IS USM Lens.  Nice zoom range, very sharp and a fast constant aperture.  It is as good as it gets.

 

If that zoom ranger just doesn't do it for you you might consider the Canon EF-S 18-200mm f/3.5-5.6 IS Lens. It is a pretty decent lens and most people like it a lot.   But you will be giving up the better IQ and faster aperture of the above.

A lot of Canon stuff. Along with, a lot of other stuff.
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