If that 50/2 macro was being used as a macro typically is (extension and
small aperture) then diffraction is probably rearing its ugly head and
limiting resolution on the film. f/22 will limit 35mm film or sensor
resolution to less than the E-1's 5MP and extension will make the
effective focal ratio smaller than indicated on the aperture ring.
Chuck Norcutt
C.H.Ling wrote:
> I can't agree with you, E-1's resolution is far from 35mm film can provide.
> Here are two shots I made in 2004 (sorry, some might have seen them in
> previous discussion before):
>
> OM4Ti 21/2 at F5.6
>
> http://www.accura.com.hk/P_06.jpg (3.3MB)
>
> E1 with 11-22 at F4 1/800s
>
> http://www.accura.com.hk/P8193517.jpg (1.2MB)
>
> Please just concentrate on the center resolution, as my 21/2 seems to have
> some problem on the edges. Check especially the lamps inside the shop.
>
> I'm enjoying my OM-5D II's 21MP quality, just love the fine details in the
> images.... and no, I won't wait for Olympus. :
>
> http://www.accura.com.hk/temp/IMG_0845_F.jpg (6.5MB)
>
>
> C.H.Ling
>
>
>
>
> ----- Original Message -----
> From: "David Irisarri"
>
> Hi all,
>
> I think we are taking fourthirds system to the limit ;) Some days ago I
> was scanning some Ektachrome E100 slides with Kodak T-grain, supposed to
> be a very fine grain reversal film. Even using the sharpest (50mm f2) OM
> macro with this film and then scanning it with my Nikon LS-4000ED
> quality of image is lower than E-1 5Mp camera. Please don´t tell me
> things like film curvature as I divided the film in 64 cells, then
> scanned every cell and finally I stitched all of them. Image was
> perfectly focused (corner to corner) but effective resolution isn´t 4000
> dpi at all. There are lot of space between silver halide particles and
> resolution is very poor. Digital sensors give much higher resolving
> power with less megapixels.
>
> Do you think future cameras will have more than 20Mp??? IMHO 15Mp is
> plenty enough and please take into account bayern pattern will disappear
> in a near future, so effective resolution will be a true 15Mp image. No
> more interpolation required for generating an image from surrounding pixels.
>
> So although diffraction limit is a problem in small sensors I am
> delighted with my Zuiko Digital 50mm f2 results at f16. Quality is hair
> raising. I don´t miss OM-SYSTEM at all regarding to image quality. I
> miss other gadgets like multi-spot metering.
>
> Something I wonder is... if airy disk is a general fall-off with a
> penumbra, do microleses help to prevent this fall-off penumbra light
> reaching the photodetector? I also suppose a telecentric system also
> reduces this effect in the corners of the image, doesn´t it?
>
> Regards,
>
> Dave
--
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