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12/08/2005 03:06:17 PM · #1 |
I have a Sigma 70-300 4-5.6 APO and it is decent lens.
I have a Tamron SP70-210 2.8 lens on the way - it should be a stellar performer, albeit maybe a bit heavy.
So i can keep the tamron for the 200-300 range...OR sell it and get a 1.4 or 2.0 TC to use on the 70-210 2.8.
Not having used a TC I am aware it can slow down focus, and it is another piece of hardware to put on and off, and it will degrade the image somewhat.
A) If i go with a 1.4, i get a 100-300 f4 lens.
B) If i go with a 2.0, i get a 140-420 f5.6 lens.
And if i go with a 1.4x TC, which one?
Tamron SP is $179, the regular one is 109, and Sigma's EX is $169 (at b&h). Anyone got experience or reviews of these?
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12/08/2005 03:10:22 PM · #2 |
By all accounts, a 2x TC is not the best option. I used a Kenko Pro 300 1.4x TC with my 70-200 and didn't notice any drop-off in picture quality.
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12/08/2005 03:30:34 PM · #3 |
I am leaning toward the 1.4 - a 300 F4 lens would be nice, and starting at 100mm is not too bad.
The kenko TC is out of stock, and pushing $200. Without any reviews, i might lean toward the Tamron SP model as it is a tamron lens i plan to use it on, and my one SP lens (24-135) is awesome. I hope the 70-210 is - i cna find very little info on it (as it is discontinued) but what i find rates it up there with fabeled L glass.
I suspect as with my other lenses, once i get nice glass, the lesser lens sits and gets dusty.
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12/08/2005 04:16:47 PM · #4 |
Originally posted by Prof_Fate:
I suspect as with my other lenses, once i get nice glass, the lesser lens sits and gets dusty. |
Very true.
Regarding converters, be sure that the choosen TC works with your body and lense combination. Or at least know up front which auto functions (if any) that you would loose. Many Fotog's have great success with TC's. I never have.
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12/08/2005 10:35:04 PM · #5 |
Originally posted by Flash:
Many Fotog's have great success with TC's. I never have. |
that is my concern. i have heard many rave and even stack them and seem to have no issues, others berate their use as image degrading.
Perhaps i can find one to borrow once i get the new lens.
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12/09/2005 12:22:36 AM · #6 |
I've tried the Canon 2 and didn't like the results. Keep in mind, though, that I was able to lay images side-by-side for comparison and printed them @ 8x10. The images were of high school baseball shot in poor light with no flash so the slightly slower speed allowed for some motion blur.
Since that time (almost 2 years ago I guess) I've become less uptight about the images so I don't know if I'd care as much. If you're printing them for consumers and the consumers aren't going to be laying images side-by-side for comparison you may find that the 2.0 gives you an OK image.
Have you considered renting one of the TC's? Try Calumet or a local pro photography shop.
Kev
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12/09/2005 01:10:51 AM · #7 |
I was pleasantly surprised when I used a Sigma 2x with a Sigma 70-200 for my Triptych shots.
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12/09/2005 03:08:35 AM · #8 |
Haven't you guys experienced any AF trouble with Kenko TC's?
I tried one for size at a photo store and AF started to behave funny.
(20D + 28-135 f3.5-5.6 IS USM) |
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12/09/2005 02:54:06 PM · #9 |
Originally posted by Didymus:
Haven't you guys experienced any AF trouble with Kenko TC's?
I tried one for size at a photo store and AF started to behave funny.
(20D + 28-135 f3.5-5.6 IS USM) |
It will becuase of the camera - canon cameras can 'read' the max fstop an will cease to funciton at 5.6 or above. A 1.4x adds one stop, so that lens and a 1.4 would be at aboug the limit - zoom at all and you exceed what the camera can do, AF wise. If it was a 2x that is 2 stops of light and you're a gonner before you start.
Generally, you need a constant aperture lens for use with a TC - a F4 lens for 1.4x, a 2.8 for 2x or 1.4x. If you want to manually focus, then you can stack more.
Also, canon specifically lists what combos work for their lenses. That is whay some folks get third party TCs to use with canon lenses. I think the canon TCs have protruding parts that get in the way with some lenses.
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12/09/2005 03:08:14 PM · #10 |
| I've seen demonstrations where a 2x is compaired to a 1.4x with interpolation. The difference is very small. With that said, a 1.4x is the most I personally would get. |
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12/09/2005 03:13:38 PM · #11 |
OK I think the 1,4 is it...so which 1.4x?
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12/10/2005 02:49:06 PM · #12 |
| Thanks, Professor, that was helpful. |
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