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Old Jan 21, 2005, 8:46 AM   #11
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Do realize that with any of those lenses you will loose auto-focs with the 1.4TC. The reason is that the fstop at their long end is f5.6. Adding the TC looses you 1 stop worth of light. The 20D will not auto-focus at an fstop larger than f5.6. For bird photography you'll have trouble unless the bird is very stationary.

All things being equal, a 2X TC will produce a lower quality image than a 1.4TC. The higher the power TC, the more is magnifies the image... and the imperfections in the lens. Also a 2x TC will costs you 2 stops worth of light.

I have heard good things about that big Sigma flash. Some have trouble with it, but most claim very good consistant results.

I would stay away from the Quantaray. I have never heard anything good about their lenses from anyone.

Its a tossup between the Tamron and Sigma 70-300. The build quality ont he Tamron is supposed to not be very good, but its slightly sharper than the Sigma. Both are fairly slow focusing, but may be good enough for you.

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Old Jan 21, 2005, 9:45 AM   #12
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YourFace wrote:
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... I guess you can still do that with the Sigma? It appears to be $180.

So what about the differences between the different Vivitar models?
There's already several threads on how to use the Sigma: http://www.stevesforums.com/forums/view_forum.php?id=53

The differences between the Vivitar and the Sigma is simply in the Auto mode:
1. The Vivitar's use an external sensor on the flash to measure/adjust its output in their Auto mode
2. The Sigma works like a Canon unit - theses devices use the camera's internal sensor instead which is supposedly more accurate (if you use it correctly), but not always like the various threads that you have already seen in this forum (in that case an external independent Auto mode might be better)
Plus the Sigma like the Canon extends the E-TTL mode to the various wireless Master/Slave(s) mode which the Vivitar can't!
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Old Jan 21, 2005, 10:02 AM   #13
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I think NHL gets paid per unit by Sigma for hocking their products here....

:-):G
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Old Jan 21, 2005, 10:10 AM   #14
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BTW I push Minolta/Metz products too... My favorite brands before the 10D... I just tend to be practical and decide with my 'brand' blinder off! :-) :lol: :G
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Old Jan 21, 2005, 10:28 AM   #15
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So...I'm thinking I will start out with the Tamron 1.4x teleconverter, the Vivitar 730AF, and either the Tamron or Sigma 70-300 lens. What sites do you use to compare specs and ratings on lenses? I'd like some more opinions about those two lenses. Is there any reason to think the Tamron 70-300 lens would work better with the Tamron 1.4x TC?

Also, is it true that I would get much better image quality out of a 70-300 lens versus a 28-300 lens?

Tamron Zoom Wide Angle-Telephoto AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF Macro Autofocus Lens for Canon EOS:

http://www.tamron.com/lenses/prod/28300_di.asp
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Old Jan 21, 2005, 11:47 AM   #16
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Another option -
http://www.ritzcamera.com/webapp/wcs...uctId=13115403



YourFace wrote:
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What sites do you use to compare specs and ratings on lenses?
http://www.photozone.de/2Equipment/easytxt.htm#Ztele
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Old Jan 21, 2005, 12:57 PM   #17
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The Quantaray flash is almost as expensive as the Sigma and not nearly as full-featured, it would seem. I'm still leaning toward the Vivitar 750AF.

The Sigma 70-300mm f/4-5.6 APO Zoom Macro Super II for $170 looks like a winner!:
http://www.shutterbug.net/test_reports/0500sb_sigma/

Also, some mixed reviews here (but good enough):
http://photosig.pcphotoreview.com/mo...0_3128crx.aspx

Any other comparisons to the Tamron 70-300?
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Old Jan 30, 2005, 12:49 AM   #18
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YourFace wrote:
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So...I'm thinking I will start out with the Tamron 1.4x teleconverter, the Vivitar 730AF,
What kind of Vivitar flash did you use with GRebel? I've ordered 730AF (it should arrive on Monday) but in a meantime I realized it won't work with DRebel. 730AF is TTL while DRebel requires E-TTL. Everybody is saying that TTL flash does not fire on DRebel. I was thinking I'll need to return it as soon as it arrives and put extra $90 for Sigma flash. Have you triedDRebel with Vivitar 730AF?
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