Misty, what would be your recommentation then? Zoom lens? Sure books are gonna be of different sizes. I am thinking about buying Canon DSLR. Just don't know which lens to choose. I was leaning toward EF 50mm f/1.4 before reading this thread.Misty wrote:Perhaps the bigger benefit is the sharpness - in the same focal length range, both two 50mm lenses provide much better optimum sharpness than the zoom lens does.
The advantage to the zoom lens is that you can zoom in and out to fill as much of the image with page as possible. That's a big advantage if you're scanning books of a variety of sizes, since it allows you to fill the frame for any of your books without moving the camera. If you're scanning books that will all be essentially the same size, you will probably be able to set up your camera to get fairly optimal use of the frame size with the 50mm.
russca wrote:Misty, what would be your recommentation then? Zoom lens? Sure books are gonna be of different sizes. I am thinking about buying Canon DSLR. Just don't know which lens to choose. I was leaning toward EF 50mm f/1.4 before reading this thread.
EF 50mm f/1.4 vs EF 50mm f/1.8 - the very first product review on that page.
http://www.amazon.com/Canon-Standard-Me ... 585&sr=8-5
bnz wrote:Hm, yes, the general statement that low iso's yield sharper pictures is definately true for the usual cases. I thought that prime lenses at higher ISOs yield less grain than zoom lenses at high ISOs, but I may be mistaken here. However, with my tests, I really had the effect that I had sharper letters with ISO 400 and upwards. I can imagine two reasons for that: 1) my lighting was really bad. Even though I had three lamps in addition to the room lights, all of them weren't very powerful (40W) or 2) this might be something that is related to the live view when using the tethered connection. This is how I manually focused my lens. I am no expert here either.
Misty wrote:I've found that zoom lenses are fine in most cases, but that depends on what level of quality you're looking for.
How much variation in size are you talking about? A few centimetres difference (like small paperbacks vs 6x9"), or much greater (small paperbacks vs A3)? The greater the variation in size, the more advantage you get from a zoom lens. Lens sharpness won't help you so much if you've cut your resolution in half by heavy cropping.
Are you imaging pure-text books you intend to run through Scan Tailor, or are there illustrations or historical book pages you'd like to retain the exact appearance of? The slight sharpness difference between a zoom and a prime will not affect Scan Tailor output nearly so much.
That might be the way to go for me. I can get 2 Canon G12's for the price of one Canon DSLR.Misty wrote:However, if you're shooting only text with no illustrations I think a DSLR might be overdoing it. I recommend a DSLR or a mirrorless large-sensor camera for books where quality imaging of illustrations, or of the original appearance of the book page, is important. A cheaper compact camera should be able to give you roughly comparable results for pure-text pages processed through Scan Tailor.
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