Lens for the Everglades: 50-200 or 70-300?

Started Mar 15, 2010 | Discussions thread
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alaska_tim
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Lens for the Everglades: 50-200 or 70-300?
Mar 15, 2010

Main Questions

If I use a teleconverter on the 50-200, what happens to my f/ and the DOF? What is the effective focal length, f/ range and DOF for the 50-200 mounted with either the EC-20 or EC-14? I am especially unclear about how to do these calculations with the 1.4x.

Also, when I zoom to 2x in playback, does this simulate the field of view of the 2x teleconverter?

Additional Questions and Background Information

I have been shooting in the Everglades for about a week now and am growing frustrated with the lack of reach and slow focus of the kit 40-150. I cannot seem to get reliably close to many bird species as they are either too small or too wary, flying away before I can fill more than a small part of the finder. Also, once in flight, the AF (on the E-620) misses about half the time (maybe a bit more). Don't get me wrong, I have adapted my photography and am having a great time. I just wish I had a lens to make many of the shots I am seeing possible.

So, I was thinking about a lens upgrade. There is the 70-300 and the 50-200. Am I missing something that costs less than $1000?

The 70-300 has the reach I am after, but I am afraid it is as slow as the kit lens, AF-wise. Comments?

The 50-200 does not reach much further than the 40-150. Am I even going to notice the difference in practice? How much further is 200 than 150?

Is the AF on the 50-200 on an E-620 fast enough for flying birds?

Thanks for the help.

 alaska_tim's gear list:alaska_tim's gear list
Olympus E-620 Nikon D7100 Olympus Zuiko Digital ED 50mm 1:2.0 Macro Nikon AF-S Nikkor 70-300mm f/4.5-5.6G VR Olympus Zuiko Digital ED 14-42mm 1:3.5-5.6 +6 more
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