fedeleal From Uruguay, joined Apr 2009, 8 posts, RR: 0 Posted (11 months 6 days 13 hours ago) and read 4831 times:
Good morning guys!
I am about to jump in and become a commercial airline spotter in the near future.
Quick question... I currently have a Canon 7D and about to buy a photo lens. Would you recommend EF 100-400mm f/4.5-5.6L IS USM lens rather than EF 70-300mm f/4-5.6L IS USM? I can imagine the more zoom, the better, but wondering if at 400mm, that lens would still produce sharp imagery vs a moderated 300 mm.
Have you had the chance to test both on the field?
For a person like me acquiring his first photo lens,
would you have any suggestion on which one to buy first?
moose135 From United States of America, joined Oct 2004, 2242 posts, RR: 11
Reply 2, posted (11 months 6 days 11 hours ago) and read 4814 times:
I've been using the 100-400L for close to 8 years, and recently moved to the 7D. I'm happy with the lens itself and the combination with the 7D. Since I shoot at airshows in addition to airliners at the airport, the extra reach is useful to me.
oly720man From United Kingdom, joined May 2004, 6604 posts, RR: 11
Reply 5, posted (11 months 5 days 20 hours ago) and read 4735 times:
Quoting fedeleal (Reply 4): linear meters/ft does each lens zoom in at its max?
What you are asking has no answer. When at any focal length the lens has a field of view so what can be seen in the field of view depends on how far away it is - a C172 closer will fill the viewfinder like an A380 much further away.
A better way of looking at it is how far away will the [pick a plane] be to fill the viewfinder/image at 300mm and 400mm - not forgetting the 7D is an APS-C camera so there's a 1.6x crop factor which means you're looking at 480mm and 640mm in 35mm terms
At 300mm (=480mm) the horizontal angle of view is 4.29deg
At 400mm it's 3.22deg
An A320 (length = 38m) would be 500m away to fill the viewfinder at 300mm and 675m away with the 400m lens.
An f18 is 17m long, just less than half the A320, so the corresponding distances would be 250mm and 340m or thereabouts.
A lion is 2m long so the respective distances would be 30m and 40m.
I've had one just off the air strip in tsavo west, Kenya. Luckily, I needed 500mm and not 50mm as he was looking for lunch!
Quoting oly720man (Reply 1): It is really going to depend on what you're going to take photos of and will the 70-100 range be more useful than the 300-400mm
For me, that's the biggest consideration. I considered a 100-400 when I was looking for a zoom lens but 100mm is too long at the short end for my needs. I think you need to consider what it is you need and whether the 70mm end will give you more of a benefit than 400mm.
Equipment: 2x Canon EOS 50D; Sigma 10-20 EX DC HSM, 50-500 EX APO DG, Canon 24-105 f/4 L, Speedlite 430EX
JakTrax From United Kingdom, joined Jun 2005, 4936 posts, RR: 7
Reply 8, posted (11 months 5 days 12 hours ago) and read 4657 times:
I have the 70-200 f/4 and the 100-400. I don't use them concurrently - the 70-200 tends to be my 'summer' lens and the 100-400 my 'winter lens'. 100mm is sometimes a bit close but I have a 24-105 to combat that problem.
arndt262 From Germany, joined Mar 2010, 80 posts, RR: 0
Reply 9, posted (11 months 2 days 12 hours ago) and read 4490 times:
The EF 70-300 L lens has the better reliability when it comes to autofocus (reliability of 98%). I know that the EF 100-400 L has some problems with that... (reliability of about 87% at autofocus, pretty poor for the price)
So the EF 70-300 L should be the lense of your choice.