Sporgon said:Using Photozone as a reference it looks to me as if the 70-300L cannot quite fully resolve 15 mp on APS-c when wide open at 70 mm, let alone 18, but the OP never said he was using this lens wide open.
Good point, but then again I didn't say so. To repeat myself - and we could probably just ask the op
Sporgon said:I disagree with your last sentence because the 'very best' in resolution terms doesn't have to be 'the most expensive'. These high mp asp-c cameras need really good lenses, and Canon now provide ones that are up to the job without being expensive; look at the 40/2.8 and the new EF-s 24/2.8.
Come on, this is self-explanatory, isn't it? Of course I was talking zoom against zoom, prime against prime, we all know you can get excellent iq if you use an older manual prime or any newer generation.
AlwaysLearning said:In terms of the 70-300L being wow, compared to the 18-135 on my body, it's wowThere are certainly times when the image isn't quite as sharp as I would expect but I put that down more to user error and a bit of post processing can usually help. All you are doing by showing comparisons on how sharp it is on FF is making me envious! I usually shoot it at 5.6 so then I can treat it as a constant aperture lens across the zoom range.
This is just what I do with the 70-300L on crop, and it's fine this way and has a very nice bokeh.You really only realize the difference with fine details, apart from the thinner dof on ff.
I mostly shoot horses and focus on their eyes - and here there's a visible difference crop vs ff. And of course to even better lenses like the 100L (which is an example of a lens that is just as good on crop).
Of course, as you wrote, if you downsize and the details happen to respond to the usual sharpening algorithms, no one see a difference. Btw that's why I didn't stretch my budget to get the larger 70-200L.
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