I'm actually using 47µF caps in my SNES... the blurring is quite unnoticable.
That's what I'm talking about! I wonder why there is blurriness from caps in the first place?
Can you explain exactly what you mean by blurry?
Lawrence, can you explain why you recommend using 220µF capacitors when other alternatives can be better suited?
This capacitor is series with the video signal only serves to remove the DC offset. Anything less than 470u will distort the low frequency parts of the video signal. 220u is used most often because it's good enough... Sometimes I see 100u used in cheap SCART cables.
Try to experement with different sized caps.... you should start to notice the distortion from 47u and below. It would be most obvious picture with very little detail.
If you use really poor quality caps then they may be attenuating the higher frequencies... that's the only way I could think they might cause the picture to be blurry. Try putting a ceramic cap, something like 0.1u in parallel with the big electrolytic.