Clever - the more detail, the less the jpeg compression can work -
brilliant! But is there a reference paper that 'proves' it?
br
jez
On 22/03/2010, iwert bernakiewicz <zuikooh@xxxxxxxxx> wrote:
> Preparing for a study trip with students to Switzerland and Italy next
> week I did a very unscientific test today.
> I was thinking of traveling really compact and taking just the 5D, 35
> shift and 90 macro.
> But I was a bit unsure about the 35 shift lately, and about adapter
> thickness influencing image quality.
>
> So I did three series with the three adapters I have, a silver AF
> confirm adapter, a plain silver one and a cameraquest black/silver
> one.
>
> Just looking at converted jpeg sizes I can see the quality of the
> files! The plain silver ones were the best @ 8,2 and 8,1 MB file size
> @ f8 and f11 (the best aperture for this lens is f11 when checking the
> files. Even fully shifted the corners are sharp, just a bit CA)
>
> F2.8 - 5.6 is sharp center but soft in the corner (6,3 to 7,1 MB file size)
> F16 is 7,8 - 8,1 MB, due to either camera shake/diffraction (speed was
> 1/60 I did not use a tripod because I won't have time nor space on the
> bus trip. Other speeds ranged from 1/2000 @ f2 to 1/125 f11)
>
> The best combination is either silver adapter @ f11, the worst overall
> is the black adapter (that is when looking at the files @ 100% :).
>
> So the silver one will come with me. Just in doubt if I'll take the 28
> f2 as well for interiors... (or the 21f3.5) So I'll have some more
> testing to do tomorrow...
>
> All the best,
>
> Iwert
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