tele coverters
Discussion
On an 18-70? Forget it.
Yes they can work okay on pro lenses, you'll likely loose AF if the TC takes the max. apperture over the F5.6 mark. ie you need a fast lens that is at least F4 with a 1.4x TC or F2.8 with a 2x TC. Also you will loose some quality that maybe acceptable with high quality matched stuff, bit dodgy otherwise.
For what it's worth I've a Sigma 70-200 F2.8 and Tamron 1.4x and Kenro Pro300 2x TC's. It won't AF with either very well! Will probably ditch them both in favour of a Sigma 1.4x TC that should work with the lens.
Yes they can work okay on pro lenses, you'll likely loose AF if the TC takes the max. apperture over the F5.6 mark. ie you need a fast lens that is at least F4 with a 1.4x TC or F2.8 with a 2x TC. Also you will loose some quality that maybe acceptable with high quality matched stuff, bit dodgy otherwise.
For what it's worth I've a Sigma 70-200 F2.8 and Tamron 1.4x and Kenro Pro300 2x TC's. It won't AF with either very well! Will probably ditch them both in favour of a Sigma 1.4x TC that should work with the lens.
I agree with the above. I use a 1.4x a lot, but a 2x rarely, and generally manually focus much of the time. I can get some good results with it, but I will take the 500mm lens if I need the reach.
As said, most of the time it's the expensive f2.8 lenses that benefit, which I don't think you've got!
As said, most of the time it's the expensive f2.8 lenses that benefit, which I don't think you've got!
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