>> I plan to sell my Sigma 15-30 and get a Canon prime wide-angle lens (20 or 24mm) instead.
1. Why do you plan to sell the 15-30?
Largely because of its slow autofocus and bulkiness. I rather cover wide-angle with a smaller lens.
2. 20mm and 24mm have VERY different FoV's. The two complement each other, not replace.
3. Which 24mm prime, 24/1.4 or 24/2.8?
4. You will have 24mm in your 24-105. Why consider another 24mm prime?
Correct on all counts. Good points.
5. The 20/2.8, despite being a prime, does not have the same quality consensus as almost all other primes.
I'll check.
6. Have you considered the 17-40/4?
No, I haven't but I will. Thanks for the suggestion.
>> I plan on keeping my 70-200/f4.
>> I'll keep my 28mm, my 50/1.4, my 100-400 L IS and my 1.4 converter.
1. Why keep both 70-200/4 and 100-400 IS?
Because the 100-400 is very large and a lens I only take with me if I know for sure I'm going to use it. The 70-200 is much smaller and can always sit in my camerabag.
2. Why keep the 28/2.8 when you will have it in the 24-105?
Largely because it's small and because I'll also keep my 10d for personal stuff, on which the 28mm is close to a normal lens.
>> I'm considering the 70-300 DO, but it duplicates other lenses.
I agree but it seems you will have other duplicates as well.
Some general questions:
1. What is your budget?
2. How much weight are you willing to carry?
3. Will the 5D be your only body?
4. Why not buy the 24-105, sell nothing, and only then see if and what you are not using any lens?
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1. I'm flexible.
2. Much of the shooting will be done close to the car, while for trips weight becomes a problem, which is why the DO is so appealing.
3. I have a 10D, which I keep, but I'm not sure whether it produces a good enough image for stock. I have a 1D, which I was planning to sell.
4. Because I'm leaving the US in the summer and can buy lenses now at much lower prices than I can when I'm in Europe.
Thanks for your reply.