DullesGuy From United States of America, joined Jul 2000, 247 posts, RR: 1 Posted (12 years 6 months 3 weeks 3 days ago) and read 3470 times:
Right now I'm using a Canon elan 7 and 75-300mm f.4-5.6 usm mostly for the pics. Hopefully soon to be a Canon Digital Rebel. But what my question is for the time being, do you think buying a 1.4 or 2x converter for more range would be worth it? Plus its a whole lot cheaper then getting a whole new lense for more range. Being that I can use it with the eventual new digi camera anyways to give me even more zoom then with the reg. Slr. Are converters harder to get quality shots with in general, or just on more marginal weather days? I do know a little bit about there being an automatic drop in the aperture? Is that correct. Any more info on what is needed to fully be known about the advantages and disadvantages of getting converters, rather then a whole new lense is appriciated!
Thanks for the help,
"..the joy of the Lord is your strength" Nehemiah 8:10
Emmett99 From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 6 months 3 weeks 3 days ago) and read 3447 times:
I have a 10D with a Canon 28-135 IS lens and a 1.4x converter. It works well with one exception. On moving subjects such as airliners it tends to jump out of focus every once in a while. So I use it sometimes, but I use it on manual focus mode only.
Ckw From UK - England, joined Aug 2010, 813 posts, RR: 12
Reply 2, posted (12 years 6 months 3 weeks 2 days 22 hours ago) and read 3431 times:
The Canon convertors are not really intended for use with this lens (or the 28-135) come to that. Optimum results will only be gained with the Canon L primes. However, it can be done. Whether the quality is acceptable or not, only you can decide. A convertor on any zoom lens will result in a noticeable loss of contrast and sharpness.
On the 75-300 you will lose 1 stop (with the 1.4) or 2 stops (with the 2x). You will also loose AF. You will also need to consider the need to use a higher shutter speed to counteract camera shake. So with an effective 600mm lens you need to think in terms of a handheld speed of around 1/500th - coupled to an effective minimum aperture of f8, this means you will be shooting pretty much with the lens wide open, which again adds to the quality problem.
Mirage From Portugal, joined May 1999, 3125 posts, RR: 13
Reply 5, posted (12 years 6 months 3 weeks 2 days 22 hours ago) and read 3413 times:
Be careful with using a Canon 2X with Canon 75-300 lens. I had a 75-300, one day I bought the 2X TC and to my surprise it didn't fit the lens, so I had to cut with a razor inside the lens around 1mm so that the fit could be possible.
Results are marginal, sometimes you get something interesting, many times you get poor quality images. Forget the auto focus.