More zoom

[roman_5]

To those with real advise,advice, or advize thanks for ur input. I'll keep them in mind. TY.

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[mjhoward]

They degrade image quality more than slightly.

Not necessarily true.

If the OP would give a little more info I might try and help, but I'm not going to play 21 questions to guess at what he/she wants to do with a teleconverter, what they want to use it with, and which teleconverters they want to use... let alone what system they're even using.

[Netskimmer]

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You darn kids and your slang.

[roman_5]

I have a canon T2i with up to 300 mm lens and wanted to shoot birds or wildlife.
( take pictures of )

[Overread]

which specific 300mm lens?

[gryphonslair99]

Well I have the canon 300 mm f2.8 and the EF 2X II and have no issues with the combo. Of course it is $7,000.00 + worth of glass. I would advize that you get this combo.

[roman_5]

70-300 mm. Not IS nor USM

[gryphonslair99]

70-300 mm. Not IS nor USM

If you are talking about something like this: Sigma 70-300mm f/4-5.6 DG Macro Autofocus Lens 509101 B&H Photo

Don't waste your time with a TC.

[roman_5]

WOW!! $7000.00. Don't have that kinda cash. That is why I'm trying to find a less expensive way to get that close-up shot at a distance.

[roman_5]

Canon 70-300 f4-5.6

[Tony S]

I have both the Canon 1.4 and 2.0 TC. On my 70-200 2.8 IS the 1.4 gives acceptable image quality, the 2.0 degrades the image too much. On the 100-400 using the 1.4Tc is hit and miss for keepers, probably 60% keepers. The 2.0 is not a consideration for that lens, it just degrades the image way too much.

I can use the 2.0 on the 400 2.8 IS lens and gain usable quality when I also stop down to f8 and make sure my shutter speed is plenty fast or I'm rock solid on a tripod.

So the answer might be your results will vary depending on the lens and technique.

[gryphonslair99]

Not familiar with a Canon 70-300 that is not IS or USM. Canon makes a 75-300 that is not IS. You sure you know which lens you have?

[bratkinson]

Don't waste your money on any cheapo screw-in teleconverters on ebay. I figured 'what the heck?' and tried a $40 combo set. Screwed on the tele and my camera couldn't focus automatically. Had to manually focus everything. When I went to unscrew it, the two-part screw-together assembly unscrewed and the 2 lenses it was made of dropped onto the floor. It might have been more enjoyable to take a pair of $20 bills and light them on fire...