Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ

need some advice

Everything camera related. Includes triggers, batteries, power supplies, flatbeds and sheet-feeding scanners, too.
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kthiessen
Posts: 7
Joined: 04 Mar 2014, 00:52

need some advice

Post by kthiessen » 14 Oct 2009, 23:59

what is an optimal distance to have the cameras mounted with respect to the location of the platen? does it really matter? i just want to be sure that the cams clear the platen in the up position but the image is still as crisp as possible.

like dans 3rd design, i plan on having it fold up, however it will definitely not fit in the plane's carry-on ;)

is the general consensus that a rail mounted platen is superior to the hinged design?

Image

ignore my ghetto mspaint diagraming skills :D

Hasher
Posts: 77
Joined: 26 Sep 2009, 03:05

Re: need some advice

Post by Hasher » 15 Oct 2009, 10:15

Hey, I think its mainly got to do with the cameras you end up using . Personally I tried a basic 3 x optical zoom and it worked just fine, just did it once the rig was finished. If you want to get more accurate idea then google 'lens calculator' and you can see the expected results for the lense you are to use.

Love your MS paint skills

kthiessen
Posts: 7
Joined: 04 Mar 2014, 00:52

Re: need some advice

Post by kthiessen » 15 Oct 2009, 11:25

Hasher wrote:Hey, I think its mainly got to do with the cameras you end up using . Personally I tried a basic 3 x optical zoom and it worked just fine, just did it once the rig was finished. If you want to get more accurate idea then google 'lens calculator' and you can see the expected results for the lense you are to use.

Love your MS paint skills
thanks, i'll try it out

spamsickle
Posts: 596
Joined: 06 Jun 2009, 23:57

Re: need some advice

Post by spamsickle » 15 Oct 2009, 12:42

I put my camera as close to the page as it will focus, which for my Canon is about 20 inches.

Since I've also attached the cameras to the platen, the focus is always the same, and I've made setting the focus a part of my CHDK script.

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daniel_reetz
Posts: 2786
Joined: 03 Jun 2009, 13:56
E-book readers owned: Used to have a PRS-500
Number of books owned: 600
Country: United States
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Re: need some advice

Post by daniel_reetz » 15 Oct 2009, 14:17

You1 has a diagram here: http://www.diybookscanner.org/forum/vie ... p=843#p843

I used it in constructing my 3rd-gen folder scanner thinger. But because my platen is very rigid, I have it almost grazing the cameras -- there is maybe 1" of clearance.

fbonomi
Posts: 59
Joined: 04 Mar 2014, 00:52

Re: need some advice

Post by fbonomi » 16 Oct 2009, 09:17

Hasher wrote:Personally I tried a basic 3 x optical zoom and it worked just fine,
Spamsickle wrote:I put my camera as close to the page as it will focus, which for my Canon is about 20 inches.
Two quite different point of views, yet two (as far as I can say) satisfied users. That probalby means that's not a critical factor, as long as you don't have the camera so close that it annoys when you turn pages, or so far away that you can't enlarge a small page so that it covers most of the page.

Photographically speaking usually lenses perform better if you keep away from both extremes of zoom (I mean, don't use the widest setting, zoom in a bit but not too much)

(Using strong zooms also means that (relatively speaking) the camera must be farhter away from the page i.e. you have a larger design)

sixtysix
Posts: 34
Joined: 23 Jun 2009, 13:07

Re: need some advice

Post by sixtysix » 17 Oct 2009, 08:41

spamsickle-any chance you could share the chdk script?
be much appreciated here.

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