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06-16-2008, 03:36 PM   #1
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BIF, suggest TC for Tamron 70-300 Di LD?

I have tried to shoot birds in flight with Tamron 70-300 Di LD. All are cropped to get closer to the birds.



Tamron 70-300 f/4.0-5.6 Di LD Macro Test Shots - Hin's Tech Corner

BIF with Tamron 70-300 Di LD Macro - Hin's Tech Corner

#1
1/800 sec, f/8.0, 300mm, iso 400, 0 Ev


#2
1/1250 sec, f/8.0, 160mm, iso 400, 0 Ev


#3
1/1250 sec, f/8.0, 300mm, iso 400, 0 Ev


#4
1/1250 sec, f/8.0, 300mm, iso 400, 0 Ev


#5
1/1250 sec, f/8.0, 260mm, iso 400, 0 Ev


Flickr Slideshow


And I want to gather inputs for a TC that maintain AF and metering, I am wondering if a Tamron 1.4x for about $140 is worth the investment to get the birds closer at 420mm. What other choices in similar cost and qualities are recommended?

Thanks,
Hin


Last edited by hinman; 06-19-2008 at 12:17 PM.
06-16-2008, 05:57 PM   #2
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Shoot, hinman. Those all look good to me with out a TC. #2 is especially awesome.
06-16-2008, 06:01 PM   #3
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brilliant work! I bought a sigma finally...
06-16-2008, 08:07 PM   #4
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Nice compostion as I have tried and but still working on it

What your exif.


cheers

06-16-2008, 11:36 PM   #5
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Those are wonderful shots!

Remember, that putting a 1.4 TC in front of this lens, you'll lose 1 f stop, this means .... what f/8 at 420mm? AF will hunt and hunt and hunt....
06-17-2008, 12:04 AM   #6
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As Pentagor said, your tamron will be toooooooo slow with TC and you may have great difficulties to focus. Anyway, those are great shots even without TC.
But as above, I would be interested in your EXIF...
06-17-2008, 06:38 AM   #7
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QuoteOriginally posted by pentagor Quote
Those are wonderful shots!

Remember, that putting a 1.4 TC in front of this lens, you'll lose 1 f stop, this means .... what f/8 at 420mm? AF will hunt and hunt and hunt....
I can confirm that the Tamron 70-300 with the Tamron 1.4x will hunt a LOT when autofocusing. It's usable in broad daylight, but probably not for moving subjects such as birds in flight...

Really, there are no TCs that will work with this lens and retain acceptable AF. You'll probably need to consider something like the Sigma 100-300/4 and a 1.4x TC.
06-17-2008, 07:23 AM   #8
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Well ... it may hunt in average lighting conditions ... but on a bright day you shouldn't really have an issue with hunting ... my FAJ75-300mm lens (which I am sure is slower than the Tamron 70-300 at the long end) hasn't really shown issues on a bright day ... on a dull overcast day I have noticed a little bit of hunting ... but not as bad as people make it out to be.

06-17-2008, 08:34 AM   #9
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from past experience, you should not consider putting a TC on any lens where the final maximum apature is in excess of F6.7 (includig the TC) because AF will not be reliable.

While people will rationalize that the hunting is "not as bad as people say" is somewhat misleading. it will not focus as yo would want, reliably enough when shooting birds, to get the shots.

Most birds are shot under some form of cover (trees etc.) and you need to be able to focus reliably in something other than bright sunlight

Also, you need to consier , just a little, shooting distance. Your image size is going to be dictated by

Image size = focal length * object size / object distance

Remember all units are the same (i.e. either in mm or meters) and your sensor is only 16mm x 24mm (approximate)

Also remember that along with the loss of light, your focal length goes up when using a TC and shake reduction DOES NOT allow for compensation when using an AF capable TC, therefore it is not as effective as it could be. this means you also need more shutter speed to eliminate shake.

I use TCs, but only on a 70-200 F2.8 zoom and a 300mm F4.
06-17-2008, 10:32 AM   #10
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Thanks for the various inputs, the EXIF are added below and updated with bigger pictures above.



Tamron 70-300 f/4.0-5.6 Di LD Macro Test Shots - Hin's Tech Corner

#1
1/800 sec, f/8.0, 300mm, iso 400, 0 Ev


#2
1/1250 sec, f/8.0, 160mm, iso 400, 0 Ev


#3
1/1250 sec, f/8.0, 300mm, iso 400, 0 Ev


#4
1/1250 sec, f/8.0, 300mm, iso 400, 0 Ev


#5
1/1250 sec, f/8.0, 260mm, iso 400, 0 Ev


Flickr Slideshow


Here are what settings in AF, metering that I use
  • I use the default multi-segment metering
  • I use AF.C exclusively
  • I normally use the selective AF with focal point in center but for the BIF, I turn to the complete AF with multiple focal points, I let the AF system work while I pan the movement hoping the AF system find the closest focal point to match the bird
  • I use ISO 400 and Av mode on f/8.0 and half press to check the shutter to be at least 1/500 sec
  • I should have tried Tv mode with 1/1000 sec but I don't trust the Tamron on anything lesser than f/8.0 in the longer end
  • I pan all shot in moving along with the bird and let the multiple AF point and AF.C work with the bird in the frame
  • I pan the bird to be in the frame and adjust zoom from 300mm down for better sharpness and hopefully better IQ if bird is not too far, e.g. on #2.

Thanks,
Hin

Last edited by hinman; 06-17-2008 at 08:55 PM.
06-17-2008, 07:49 PM   #11
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Can't find Tamron 1.4x teleconverter

I have a hard time finding the Tamron 1.4x teleconverter. If anyone have information, please pass along. I may end up trying out the Kenko 1.5x tele-converter. Inputs are very welcome.

Thanks,
Hin
06-18-2008, 02:40 AM   #12
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It took me a while to hunt one down as well ... Tamron don't make them anymore.
You you search for the Tamron TC picture thread .... there's links in there for recent places where it was for sale ... it's a great thread with some good images.

The Kenko wasn't to bad ... although it had AF issues all the time where the Tamron one was much better .. and worked with HSM lenses as well.
06-18-2008, 08:05 AM   #13
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I just purchase the Tamron TC from Roberts, which was the only place I found that had them available.

Roberts New & Used Digital and Film Cameras, Photography Supply and Electronics

It looks like they're out of stock now, so you might be out of luck. When mine arrives, I'll let you know how it looks, as I have the same Tamron 70-300mm as you do.
06-18-2008, 08:19 PM   #14
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Hin, you have 25 pages of 1.4/1.5x TC reviews here.

For those that say that the Tamron 1.4x TC will hunt with the Tamron 70-300mm, I say "maybe not". I have used mine with a Sigma 70-300mm APO and at 300mm, when the effective aperture is f/8, it has focused even in low light at dusk...with no hunting. In fact, I'll go as far as to say that I see no difference in focusing speed with the Sigma lens with or without the TC. This is also the experience of many other users; just read the thread I linked above.

Only problem with the Tamron TC is that it's out of production and is very hard to find. If anyone wants to buy it, make sure it's the MC4 version.
06-19-2008, 12:15 PM   #15
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QuoteOriginally posted by Miserere Quote
Hin, you have 25 pages of 1.4/1.5x TC reviews here.

For those that say that the Tamron 1.4x TC will hunt with the Tamron 70-300mm, I say "maybe not". I have used mine with a Sigma 70-300mm APO and at 300mm, when the effective aperture is f/8, it has focused even in low light at dusk...with no hunting. In fact, I'll go as far as to say that I see no difference in focusing speed with the Sigma lens with or without the TC. This is also the experience of many other users; just read the thread I linked above.

Only problem with the Tamron TC is that it's out of production and is very hard to find. If anyone wants to buy it, make sure it's the MC4 version.
Thanks Mis, I looked everywhere and the tamron 1.4x adapter is nowhere to be found, not even in RobertTech and few other places mentioned in the Tamron 1.4x thread. I will settle with cropping for now.

Thanks,
Hin
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