Effective optical resolution of Epson 4990

[Rider]

I know the Epson 4990 is popular with people here. I was wondering whether you recall what it's effective optical resolution is. Thanks.

[sanking]

I know the Epson 4990 is popular with people here. I was wondering whether you recall what it's effective optical resolution is. Thanks.

1600 - 1800 dpi.

Sandy

[Rider]

Thanks Sandy.

Is the 4990 color sensitive enough that it would be worthwhile getting IT8 targets for it?

[Rider]

Wow, the 4990 Pro included iT8 targets. http://www.epson.com/cmc_upload/0/00..._InfoSheet.pdf

Does that answer my question?

[Brian Ellis]

Tests by the late Ted Harris published in View Camera magazine showed 2100-2200 ppi. I've seen the same number in other reviews and in posts by others here.

[BetterSense]

The limited tests that I ran showed that you don't gain much by scanning over 2400dpi. For what it's worth.

[domaz]

The limited tests that I ran showed that you don't gain much by scanning over 2400dpi. For what it's worth.

I think that's true but I have found you get slightly better quality if you scan at the maximum dpi and then downsample. I have Vuescan set to scan at 4800 dpi and then downsample to 2400 dpi. Setting the scanner to 4800 dpi seems to "tell" the scanner to use the maximum quality available for the scan.

[Rider]

Ok, assuming the number is between 1600 and 2200, how would you squeeze the most of this scanner--scan at 2400, or scan at 4800 and downsample to 2400 using scanning software (i.e. output at 2400)?

[sanking]

Ok, assuming the number is between 1600 and 2200, how would you squeeze the most of this scanner--scan at 2400, or scan at 4800 and downsample to 2400 using scanning software (i.e. output at 2400)?

First, shim your film holder to make sure that the film is at the optimum plane of focus.

Second, scan at the highest possible resolution, 4800, then downsize to 2400.

Sandy King

[Rider]

Sandy,

Can you explain what "shim the film holder" means please? Thanks!