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Old Feb 20, 2013, 6:30 AM   #11
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"Generic" 2X Teleconverters (Teleconverters that work with any lens) suffer from a lot of chromatic aberration in areas of high contrast. WCKSer's sample images contain no such areas of high contrast, but your birding shots almost certainly will.
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Old Feb 20, 2013, 9:58 AM   #12
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Well thanks for the advice guy's. The 55-250 will just have to do.

Ifen not I’ll just haffta shoot dem critters and den take they piture. Cost me less dollars and den I get fed two.

Just kidding I’m not Ted Nugent. I am just not willing to pay that much for a winter hobby. I was just looking for a bit more reach I am happy with the quality of the 55-250.

Thanks Though.

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Old Feb 20, 2013, 10:57 AM   #13
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You might be able to get by with a 1.4X TC. Optically, they're quite good, and reports are you can still AF with them.
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Old Feb 20, 2013, 10:59 AM   #14
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And there's also the used lenses I mentioned.
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Old Feb 20, 2013, 8:58 PM   #15
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The Kenko, Tamron and Vivitar 1.4X TC are very shallow. I don't think you can attach an EF-S lens to it. Try shoot some bird pictures with the EF-S 55-250mm to see if you are happy with it and start from there.

I shot a couple pictures in my neighborhood today with my Sigma 18-250mm at 250mm. The pictures come out OK.
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Canon 5D MKII, EF 24-105mm f/4L, EF 50mm f/1.8, EF 100mm f/2.8L Macro, Tamron 70-300mm f/4.0-5.6 SP Di VC USD XLD, Sigma DG 150-500mm f/5.-6.3 APO HSM.
Canon EOS T3i, 7D and 70D EF 17-40mm f/4L, EF-S 55-250mm f/4-5.6, Sigma 18-250mm f/3.5-6.3 DC OS HSM, 430 EXII Flash.
Sony A200, SLT-A58 System with HVL-F42AM Flash.
Mirrorless APS-C camera: Samsung NX100, Canon EOS-M.
M4/3 systems: Olympus OM-D-E-M5 and Panasonic DMC-G3.

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Old Feb 21, 2013, 5:58 AM   #16
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Chromatic Aberration
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Old Feb 21, 2013, 12:07 PM   #17
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Quote:
Originally Posted by TCav View Post
Yes, this lens has CA problem at the long end. The purple fringing is most noticeable when the background is clear. This is the drawback of a jack of all trade lens, you give up something for the convenience. The newer version of this lens is probably better as Sigma ramps up their quality control. This center sharpness is OK though.
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Canon 5D MKII, EF 24-105mm f/4L, EF 50mm f/1.8, EF 100mm f/2.8L Macro, Tamron 70-300mm f/4.0-5.6 SP Di VC USD XLD, Sigma DG 150-500mm f/5.-6.3 APO HSM.
Canon EOS T3i, 7D and 70D EF 17-40mm f/4L, EF-S 55-250mm f/4-5.6, Sigma 18-250mm f/3.5-6.3 DC OS HSM, 430 EXII Flash.
Sony A200, SLT-A58 System with HVL-F42AM Flash.
Mirrorless APS-C camera: Samsung NX100, Canon EOS-M.
M4/3 systems: Olympus OM-D-E-M5 and Panasonic DMC-G3.
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Old Feb 21, 2013, 3:47 PM   #18
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This is what I get, 21 feet from lens to feeder with the Canon 55-250 at 250mm. The only thing I have done is convert from raw file.



Last edited by Jbird87; Feb 21, 2013 at 5:44 PM. Reason: Sorry posted wrong pic first time.
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Old Feb 22, 2013, 1:58 AM   #19
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That's actually a pretty shot. Are you shooting through a windows? If you are, you can put the bird feeder closer to the windows to bridge the gap between the birds and your camera. The picture looks a little washed-out, but you can brighten it up with software.
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Canon 5D MKII, EF 24-105mm f/4L, EF 50mm f/1.8, EF 100mm f/2.8L Macro, Tamron 70-300mm f/4.0-5.6 SP Di VC USD XLD, Sigma DG 150-500mm f/5.-6.3 APO HSM.
Canon EOS T3i, 7D and 70D EF 17-40mm f/4L, EF-S 55-250mm f/4-5.6, Sigma 18-250mm f/3.5-6.3 DC OS HSM, 430 EXII Flash.
Sony A200, SLT-A58 System with HVL-F42AM Flash.
Mirrorless APS-C camera: Samsung NX100, Canon EOS-M.
M4/3 systems: Olympus OM-D-E-M5 and Panasonic DMC-G3.
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Old Feb 22, 2013, 7:02 AM   #20
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This was shot out the back door I just slid it open enough to get the shot. I plan to move it closer to get the bird’s a bit fuller frame, and sharper. That will work fine here at home, but not out on the trails. This is why I was looking at 2x converters.

I have decided to rent a lens for vacation to see the difference. As much as I hate the thought of paying that much money for such a small item, and after owning a business and watching people pay 4 and 5 times the amount for an item. It is really hard to spend that much money on mass proposed anything. Especially just for a hobby.
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