MightyFalcon From Oman, joined Jun 2001, 384 posts, RR: 9 Posted (12 years 5 months 3 weeks 2 days 4 hours ago) and read 1358 times:
Please forgive my inexperience in this domain, but I haven't actually ever used one of these.
I would like to know what difference do you make between a converter and an extender, if any?
As a French guy, my technical English is a bit limited, which definitely doesn't help if I want to avoid making any mistake when purchasing the item.
My problem is that I am going in a few weeks time to Africa for a photo safari in a wildlife park and I'm afraid that, although an excellent and powerful lens, my Canon 100-400mm f/4.5-5.6 L IS USM might be a bit too short sometimes.
I've checked the B&H website and found these two ones:
Ckw From UK - England, joined Aug 2010, 813 posts, RR: 14
Reply 1, posted (12 years 5 months 3 weeks 1 day 21 hours ago) and read 1308 times:
The life size convertor is designed specifically for the 50mm macro lens to increase its maginifaction from 1:2 up to 1:1 - this is useless to you.
What you should be considering is either the Canon Extender EF 1.4x or EF 2x which will increase the focal length of your lens by either 1.4x or 2x at the cost of one or two fstops.
BUT in the case of the 100-400, applying either of the convertors will result in the loss of AF, and a distinct loss in sharpness and contrast. In my experience, the 100-400 + 1.4x provides acceptable quality, 100-400 +2x does not.
As a general rule, I'd suggest you would be better sticking with the 100-400 and enlarging the images where necessary. If the shot is sharp, a fair degree of enlargement is usually acceptable. A shot which fills the frame, but is of poor quality, is worthless.
I found the only (relatively!) affordable route while retaining sharpness was the Canon 300mm f4 LIS plus 2x extender.
MightyFalcon From Oman, joined Jun 2001, 384 posts, RR: 9
Reply 2, posted (12 years 5 months 3 weeks 1 day 15 hours ago) and read 1279 times:
Thanks Colin for your reply.
Actually, you made me save some $: Although I knew about the loss of AF, I was not expecting any loss in sharpness or contrast.
I'll stick to your advice; anyway, if I find my pictures not good enough, it will give me an excuse to go back to Africa!