Teleconverters
Hello,
I have a canon 70-300 IS USM/350d and wondering if there are any teleconverters out there that will work with this lense just to get a little more reach? thanks for any info. |
Teleconverters
"Dave" wrote in message
... Hello, I have a canon 70-300 IS USM/350d and wondering if there are any teleconverters out there that will work with this lense just to get a little more reach? thanks for any info. I've used my EF 70-300 f/4-5.6 IS USM with a Tamron 1.4x and 2x however I am not totally pleased with the results. You should put it in manual focus mode. With the 1.4x and a bright high contrast scene, the autofocus confirmation indicator works. The IS works pretty well with the TC as well but it is better on a tripod. The main problem is that the resolving power doesn't increase that much. It does some, but not as much as you might expect and getting accurate focus isn't easy. So it isn't good for quick snapshots with a TC. You need to have time to carefully focus and use a remote release. I find also that I usually am using it for things that are further away rather than smaller and the pictures lack contrast when I use a TC. You can correct this somewhat in photoshop, but you don't get the rich colours that you get without the TC. The increased chromatic aberration is easy to fix and a very small issue. I'd say put the money in savings for a longer lens. |
Teleconverters
Dave wrote:
I have a canon 70-300 IS USM/350d and wondering if there are any teleconverters out there that will work with this lense just to get a little more reach? thanks for any info. I assume you want to use it on a DSLR. One problem here is the format factor. Since the DSLR sensor is small than regular 35mm film, things are magnified by the sensor. So DSLRs are already rather demanding when it comes to lense resolution. By adding a teleconverter you further enlarge any fuzziness or lense errors. With a zoom, the result is most likely disappointing. While teleconverters can be useful, that is usally only the case with really expensive prime telephoto lenses. Another problem is light. What is your aperture at 300mm? I guess it could be f5.6, and with a 1.4x teleconverter that turns into a 420mm f8, which is not all that useful unless you use a tripod or you have really brilliant sun shine. AF probably does not work, and even the focus indicator may give up. Thomas |
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