How I scan

[zk-diq]

just set up my scanner

 

[kgston]

Ooo, nice.. But you mount the film inside the drum?? That's a first..

 

[G-man]

Ooo, nice.. But you mount the film inside the drum?? That's a first..

That's a drum scanner. Very common in the days before digital if you want high quality scans.

 

[zk-diq]

mount outside the drum,

 

[kgston]

mount outside the drum,

I see, looks like inside the drum from the picture.. Haha.. It's a vertical drum scanner? Looks like an ICM.

 

[zk-diq]

kgston, that is the size.

 

[kgston]

Wah! That size is out of the world... I thought it was one of the newer models with the vertical spinning drums... Do you usually do wet mount with mylar overlay? Or you just to a dry mount with masking tape? Any issues with maintaining flatness with a dry mount?

 

[zk-diq]

Wet mounting gives the best result, but if only for web viewing then dry mount can do too. To reduce newton ring, anti newton ring powder may apply. Oil mounting eliminate film base scratch line and fine spot, any enlargement more then 3x, pickup optics and photomultiplier can see it. There were no problem in flatness with dry mount.

 

[kgston]

Wet mounting gives the best result, but if only for web viewing then dry mount can do too. To reduce newton ring, anti newton ring powder may apply. Oil mounting eliminate film base scratch line and fine spot, any enlargement more then 3x, pickup optics and photomultiplier can see it. There were no problem in flatness with dry mount.

I see... Cool, thanks for the detailed explanation

 

[zk-diq]

I just replace a new xenon lame cost me USD$550, will make some test again

 

[zk-diq]

dry/wet mounting, adjusting the grey balance.

 

[zk-diq]

original 6x7cm fuji RPD

 

[zk-diq]

if full frame is about 105 cm x 90 cm in size 304dpi

 

[zk-diq]

The difference between dry mount and oil mounting is that you will have less black spot / spike. This is due to the film base is not 100% smooth and scratch free, light beam will be deflect by that and PMT/Lens will pick it up and become a dark tiny spot

 

[kgston]

Do you have problems with trapped air bubbles during wet mounting? Especially at the edge where the mylar overlay in the top meets the edge of the film and the drum.. Usually the film is thick enough to have air bubble on the side which may encroach onto the image sometimes..

 

[zk-diq]

if you have a mounting station, then bubbles problem will be less. Your oil too thin or too thick is another issue. paraffin oil is fine, the vendor who sell montage gel has some modifier that give less bubble problem.
I just buy a bottle of paraffin oil from medical hall.

 

[izerLee]

Hi zk-diq. Question: Will you be offering scanning services? I am keen for sure. My darkroom is in its final stages and I should have a steady stream of negs for scanning from early next year.

 

[zk-diq]

Hi izerLee, I am not in a commercial operation and is not worth of doing so either, but kgston do provide some service. However if u do require some work to be done, yes I see where I can assist. in this region, is very hard to find traditional high quality scanner and people who know how. only using PMT tube you may discover how much detail/tone a simple film can hold.

 

[zk-diq]

In the old days Scanning is mainly for colour repro industry. High degree of colour accuracy and tone/detail scanner hardware/design build and software/operator is a must to full fill the requirement.
below is a rough sketch of how things is done:

 

[zk-diq]

light source can be Halogen/xenon lamp