WalterMo wrote:DAVID will eliminate eventual distortions during the calibration process.
GreyhoundZero wrote:Regarding lenses for the camera portion, it seems multiple people have opted to customize their webcams with lenses that are much longer than the one built in. Is this to increase the depth of focus?
WalterMo wrote:GreyhoundZero wrote:Do you intend to modify a webcam? If yes, which one?
fred_dot_u wrote:Just to toss a nickel's worth in here... I've modified a Logitech Pro 9000 with a CS mount lens. I did have to purchase separately the IR filter and add it over the sensor, as the original Pro 9000 has the filter as part of the lens that is removed. The lens I purchased to fit the CS mount works great, manual iris, adjustable focal length. I've not recently done any work with the David system, however, so I can't give you a long term reference.
I am interested in learning more about your projector modification. Do you have a representative link for the eyeglass attachment lenses you find to work well?
fred_dot_u wrote:There is quite a bit of difference between the Pro 9000 board and yours. I would not be the one to suggest that you could make it work, unless you find someone else who has done so. My lens is 6-15mm focal length, so your 2.8 - 12 mm lens seems a bit out of ordinary range.
fred_dot_u wrote:The range of zoom would, in your case, be 2.8mm to 12mm, while the distance from the lens to the sensor is determined by the mount. My CS mount placed over the sensor resulted in the lens being at the proper distance from the sensor to permit clear images. You can find single figure lenses, i.e., 15mm focal length. This implies no zoom capability and a fixed magnification and fixed field of view (angle of view) somewhat limiting your ability to use different size calibration panels.
The lower number (2.8mm) means you have a low magnification and a wide field of view. The higher number (12mm will provide greater magnification and a narrower field of view.
It has been months since I have turned on my David, so I cannot recall that level of zoom I used with my lens. I do recall that I rarely used the wider setting, lower number.
The lens you linked has a manual iris which is good, and a relatively high speed lens (f-rating) which lets in more light than a slower lens.
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