[jt_cph_dk]

Hi tuco, yes I could do that, but Im planing on exhibiting some BIG landscape photos. And therefore need to develop a format/procedure for that. The V750 I just got is keeping me real busy these days and the same goes for the SilverFast Ai. Im trying to decide whether or not I can find a way to handle the more difficult dark photos with this setup or — as I have done up until now, rent an Imacon downtown? The Epson uses it´s second and better lens at 6400 dpi, I think? Please advise me if you are experienced tuco — regards Jakob

[tuco]

...rent an Imacon downtown? The Epson uses it´s second and better lens at 6400 dpi, I think? Please advise me if you are experienced tuco — regards Jakob

There are people on the forum more experienced at making large prints from scans than me. I have not gone beyond a 16x20 with my scans. They could offer you better advice. But it probably comes down to what quality level you want. In the old days there was a formula for max print quality size you could expect based on the lp/mm of the optical path to the final wet print.

At 70 lp/mm for medium format, you could expect a 20x24 print to be on the that edge. And that probably applies to scans too. The MTF of the optical path of the scanner has to be a limiting factor too, I suspect.

[jt_cph_dk]

Thank´s, I should post a thread on scanning. My main concern is to transfer to digital print the superb image quality, contrast and color depth that the 6X7 offers
and the deep shadow areas in the photos are obviously the most problematic.



At 6400 dpi there are about 100 or more pixels pr grain on a 160 ASA film, it looks like to me. Im a hands on man and my math skills are..ahm..not to impressive.

[jt_cph_dk]

In this photo, a 3200 dpi scan (below) shadows are flat and noisy:

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Last edited by jt_cph_dk; 11-24-2011 at 03:01 AM.

[tuco]

At 6400 dpi there are about 100 or more pixels pr grain on a 160 ASA film, it looks like to me. Im a hands on man and my math skills are..ahm..not to impressive.

Are you aware that your scanner is only good to about 2400dpi? Scanning beyond the optical path or interpolated resolutions does not add more detail to your image.

[jt_cph_dk]

I don´t think it interpolates at 6400 dpi, hence the second lens on the V750?
Screen shot of a 6400 dpi scan crop shown at 500% magnification

[tuco]

I don´t think it interpolates at 6400 dpi, hence the second lens on the V750?

According to filmscanner.info that scanner tested to be the same optical resolution of the V700 which is about 2400dpi.

"The sensor of the V750 is able to get the indicated 6400 pixels per inch, however the "High Pass Optics" system of the scanner does not nearly reach the required quality required for capturing with the full resolution."

Which is typical of commodity flatbed scanners.

[jt_cph_dk]

I´ll check out that article, thank´s for linking tuco. But don´t you think it looks like it (the example photo) isn´t interpolated? The single pixels are quite different from their neighbour pixels it seems to me. And then again, filmscanner.info are probably testing thoroughly.

*note. Just read the article, which is very negative about the V750.
The end of the review might explain why?
»Please, feel free to visit our online shop - it's the only shop on the Internet which is fully specialized on film scanners and accessories!«

[goddo31]

No doubt filmscanner.info have their own bias, but I don't think it's realistic to expect the Epson scanners to deliver a true 6400 dpi scan.
I think that website is useful due to the effort they seem to go to in testing for the best optical resolution, across different scanner models...

Now I don't mean to be difficult, but it could be useful to do some of your own tests. Like scanning at 6400dpi then comparing to a scan at 2400dpi upscaled to 6400dpi (using a good algorithm). My own tests when I first bought my V700 weren't very scientific, but I doubt there will be much difference in real information recorded by the 6400dpi scan.
It will just be... bigger.

[jt_cph_dk]

Hi, Testing and comparing scans is exactly what I am into. And it´s actually very interesting (..not as much as taking photos though) but certainly better than post processing which is also fun but not all day long on every photo — so developing a scanning format setup and workflow. I wrote to the Epson Support Team yesterday to clarify the question and to know what to expect, regards Jakob

[jt_cph_dk]

..and here is what it is all about

https://www.pentaxforums.com/forums/members/jt_cph_dk-albums-god-damn-pentax-...cture34203.jpg

https://www.pentaxforums.com/forums/members/jt_cph_dk-albums-god-damn-pentax-...cture34204.jpg

[jt_cph_dk]

Pentax 6X7, Super-Takumar 2.4/105, Kodak Portra 160 NC, Epson V750, Silverfast Ai (2400dpi)


Pentax 6X7, Super-Takumar 2.4/105, Kodak Portra 160 NC, Epson V750, Silverfast Ai (1200dpi, Digital Ice ‘Quality‘, USM 50%)

[jt_cph_dk]

The Epson Support Team claims that the maximum optical solution when scanning film or slides is 6400x9600 dpi. The scanner is capable of scanning up to 12.800x12.800 using software interpolation. Both the V700 and V750 are capable to do this. This is not news, it´s what is says in the manual — but now we have their written word for it.
Regards Jakob

[itshimitis]

It's all down to what you believe. If your car manual tells you that you can get 55mpg do you believe it or is it clever marketing? It has to be capable of it or else it would be misleading. But it only needs to be theoretically capable of it. It's all down to a set of circumstances and using the best techniques and tools to get the best out of it. I have the V600. Do I use the highest available resolution? No. Have I ? Yes. I didn't like the results. A flatbed is never going to get the best results. It's a good starting point it is. If I could convince my wife of the values of a coolscan then I'd get one. The coolscan has theoretically lower resolution than V700/750 but it beats it hands down

[tuco]

The Epson Support Team claims that the maximum optical solution when scanning film or slides is 6400x9600 dpi. The scanner is capable of scanning up to 12.800x12.800 using software interpolation. Both the V700 and V750 are capable to do this. This is not news, it´s what is says in the manual — but now we have their written word for it.
Regards Jakob

Just the answer I'd expect too. If you could get true 6400dpi scan on medium format from a $750 scanner, people would sell their $20,000 scanners and use it. The Hasselbad X5 only does 3200dpi for medium format.