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Author Topic:   pictures - cameras - magnification

Posts: 136
Registered: Oct 99

iconnumber posted 11-18-1999 05:37 PM     Click Here to See the Profile for WGS     Edit/Delete Message   Reply w/Quote
What equipment could I use to provide magnified images of marks on silver. Of course, I do have a magnifying glass, but I need something stronger. Possibly as part of the same question, what kind of camera is appropriate for taking magnified pictures of silver marks? I would want to be able to transmit such pictures by computer.

Thanks for your help. WGS

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Scott Martin
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Posts: 11482
Registered: Apr 93

iconnumber posted 11-27-1999 08:50 PM     Click Here to See the Profile for Scott Martin     Edit/Delete Message   Reply w/Quote
This is a very large topic and really belongs on a photographic forum. Generally, really high quality digital cameras are very expensive when compared to film based cameras. Film based cameras have a much larger compliment of lenses and filters available. Film (i.e., chromes) will provide the highest resolution and color depth. Only the most expensive professional digital cameras come close to film. Most of the needs of us average people can be generally fulfilled by a much less expensive approach.

You say want to transmit the pictures by computer. This can be done with any photo/image whether it starts out as film or digital. The higher the quality of the photo/image, the larger the file and the longer it takes to send. The question is, what is the recipient going to do with the image? This should be determined first. What is the final output destination of the photos/images? For example, is the photo going to be used online in a web page, in a CD-ROM catalog or printed on laser printer, color laser printer, color ink jet printer, digital press, digital photograph printer or made into color separations & printed on a digital plate maker (for use with offset printing), etc.? Each of these destinations comes with a large number of variables all which need to be considered when selecting a camera image quality (digital or film).

By now you should be beginning to see that this really is a vary large topic and should not be discussed in such detail on a silver forum. Nevertheless, if I haven't totally confused you .... the following might be what you are looking for. wink

On a film camera and some digital cameras the manufacturer provides lenses with a close up setting. Go to the store and see if it works as well as you like. Try several cameras. You should also see if the manufacture sells "close up" filters or attachments. Most stores today will let you play with the cameras they sell. Make an appointment, take something to photograph and test each. Have them put the image on a disk (or have them email them to you). Inspect the images on your computer and output device and select what you like.

If you decide to use a film based camera or film based camera that has been converted to digtial......

Most 35 mm cameras use removable lenses. These cameras and lenses can be used with extension bellows or tubes which will get you in real close. These extension bellows or tubes can greatly reduce the amount of light making it to the image plane, so lighting and exposure becomes very important. But be careful, if you use a film camera back that has been converted to digital, the image area of the camera back may not be physically equivalent in size and placement to a film image area such that extension tubes will not work well (if at all).

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Posts: 136
Registered: Oct 99

iconnumber posted 11-30-1999 09:28 AM     Click Here to See the Profile for WGS     Edit/Delete Message   Reply w/Quote
That's just the kind of information I was looking for. Now, I have a better idea of what questions to ask. Thanks.


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