🚀 go-pugleaf

rafe b wrote:
> On Wed, 01 Mar 2006 10:59:57 +0100, Ernst Dinkla
> <NoEntry@pigment-print.com> wrote:
> 
> 
>> It is a 33% on both axis. The 9600 stepping rate over the 
>> length is in both SPI resolutions a heavy oversampling 
>> considering the well size. But the longer lens makes the 
>> scanned area (at one sample) covered by one well 33% smaller 
>> in both directions so the oversampling with the longer lens is 
>> reduced compared to the wider lens.
>>
>> There's another concept change I think. Unlike the 2450 up to 
>> 4990 models the lid isn't meant to be taken off for reflective 
>> scans of originals larger than A4. The DOF of the wider lens 
>> that covers the A4 scan bed no longer needs to have best focus 
>> at 1 mm above the glass for the film holders and still 
>> acceptable focus at the scan bed and the 2,5-3 mm higher rim 
>> around the scan bed. The longer lens takes care of the film 
>> holders and will have less DOF. The wider lens will focus on 
>> the scan bed and will have less DOF too. The scanning of 
>> originals larger than A4 is sacrificed for that with less 
>> sharpness.
>>
>> The matrix CCD and the over-sampling still requires sharpening 
>> but less than with the lens system used on the older models.
>>
>> I'm not surprised that photo-i gets so excited and I expect 
>> more than the 33% quality gain.
> 
> 
> The snippets now showing at photo-i don't tell us very 
> much, since we don't know the actual film areas involved 
> in the hi-res samples.

> 
> Have you ever seen the lens in one of these film/
> flatbed scanners?  Have you ever looked at the lens 
> in an LS-8000/9000?
> 
> I really know very little about optics, and am 
> seriously puzzled at the complexity of the Coolscan 
> lens.  According to Nikon, it has 14 elements in 
> six groups, and six of those 14 elements use ED glass.
> 
> Why?  I mean, this is probably more sophisticated 
> than any *camera* lens I own.
> 
> In any case I can assure you that the lenses in the 
> Epson 700/750 are nothing like this.  Also, in the 
> Epson, there are probably several mirrors in the 
> path between the film and the imaging lens.  Those 
> extra reflections can't help the image quality.
> 
> 
> rafe b
> www.terrapinphoto.com

Rafe:

Yes, I have seen the lens assembly in my Nikon 8000. 
Impressive lens. One mirror.

The Epsons have a different concept and the lenses are not in 
competition with the Nikon lens. The use of the Matrix CCD + 
over-sampling + a lot of light,  is another route. It would 
work with a pinhole lens if needed. I have wondered if they 
use the lens at diffraction to get the DOF needed, the wide 
angle covered, the light fall off compensated and keeping good 
geometry. You need sharpening at the end with all the 
ingredients of that concept. Now they emphasise in the V 
models the higher speed of the lens so I think they went for 
more sharpness and less DOF. At least for the longer lens.

The Nikon uses it rows of CCDs for speed, the light is reduced 
if compared to the Epson and the sharpness of the scan is 
right there after the scan. There's no quality loss if only 
one row of the linear CCD is used. With the 8000 there's even 
less quality with all the CCD rows in action. Multi-sampling 
not counted.

There is a picture of the Epson lenses at the Japanese pages:
http://www.i-love-epson.co.jp/products/colorio/scanner/gtx900/technology.htm

I expect that the Nikon 8000/9000 still beats the Epson V750-M 
Pro in MF and 35 mm quality but the Nikon doesn't scan 4x5 and 
panorama sizes (and possibly 5x7's) at 3000 PPI, doesn't do 
reflective A4 and 8x10 film at 2000 PPI, doesn't come with wet 
mount carriers from the factory.

The first German magazine tests of this scanner will tell 
more. Photo-i is always fast but not very consistent in its 
testing and it is also very manufacturer friendly. ISO 
standards tell more.

On the test crops:
Of the crane there is a full size pic in the 4990 review. It 
is a pity that he didn't use the same crop.


Ernst

                    --
           Ernst Dinkla


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