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Depth Of Focus

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Pillar of the Community
United States
673 Posts
 Posted 12/29/2007  5:18 pm  Show Profile   Bookmark this reply Add InfiniteInterest to your friends list
Thanks Maltuna

I am going to have to try and manipulate the f stop I guess and see if it helps.

I try to take all my pictures perpendicular to the coin, and it ususally works pretty well. Sometimes certain things cannot be seen from a directly above angle - this is where the problem is. Increasing the f stop number will probably help, but the longer shutter speed will surely not. I have a small tripod but using a loupe over the lens does not allow me to really steady the tripod, only use it to semi-steady my shaky hands, more zoom...more shaky !

Thanks for taking the time.
Forum Dad
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 Posted 12/31/2007  1:09 pm  Show Profile   Bookmark this reply Add bobby131313 to your friends list
quote:
I am having trouble getting any depth when zooming. I have an 8 megapixel Kodak with a macro setting. I use a 10X loupe over the lens for getting real close


Sounds like serious overkill to me. I have a 4MP Olympus and can fool some people that I used a microscope. With 8MP you shouldn't need a loupe. Also you shouldn't need to zoom at all with the macro setting on, in fact a lot of cameras disable the zoom in macro mode for this reason. You should be able to get an inch or less from the coin in macro mode.

Ditch the loupe and the zoom, move closer, and I'd bet your depth issues go away and you still get photos that will rival any entry to mid level microscope.
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 Posted 12/31/2007  3:09 pm  Show Profile   Bookmark this reply Add Amazon99 to your friends list
I agree with bobby. That's what I do with my 7.2 camera. The only pain is trying to get enough light when your that close.

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Pillar of the Community
United States
7123 Posts
 Posted 12/31/2007  3:26 pm  Show Profile   Bookmark this reply Add Metalman to your friends list
Straight on photo's can be done like was mentioned ,,but If I'm understanding what you doing is trying to get the camera to see what you see on the coin .

The best advice I can give for phot's that are not straight onto the coin is focus in the middle of what you want to show ,, not top not bottom but in between .

Most of the time to do this I have to hand hold my camera ,, I can't get the angle and the distance right on a tripod ,,and then lighting adjustment have to be made to shade the area to reveal what you can see with your loupe and eye .
Pillar of the Community
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 Posted 01/01/2008  6:40 pm  Show Profile   Bookmark this reply Add InfiniteInterest to your friends list
Thanks for the help guys. I guess I am used to cameras that don't have the megapixels this one has. I have taken more without any magnification and they do seem pretty good, although they do seem to pixelate upon zooming just a bit before I would like them too.

This Kodak apparently does not have a "Macro" mode, but it does have a picture of a pretty flower that says for objects less than 28 inches away, using that I can get between 2 and 3 inches from the coin, but no closer. The pics I am getting are fine for grading and showing off, but they may fall short on smaller coins. Dollars fill the field at 2.5 inches but not cents, and I cannot get in closer.

Taking the pictures straight on is not that much of a problem , it is the angle pics I need sometimes I was looking for tips on. When trying a side shot from an angle the focal point diminishes drastically in front and behind the center of the image. I can increase the depth by getting farther away, but then I lose the detail I was trying to get. I also have a very hard time doing those shots with the tripod Metalman, it is not quite that adjustable so I hand hold those which makes it even more difficult.

A relative newbie to digital photography, it sure would be easier to use my Canon T50 (yea it's old...but I like it) , but then I can't share as easily and it cost alot to develop that film !Thanks for the tips guys, I hope the help shows in my later post with pictures.
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717 Posts
 Posted 01/02/2008  03:35 am  Show Profile   Bookmark this reply Add yechi7 to your friends list
That "pretty flower" is Macro mode!
Bedrock of the Community
United States
20753 Posts
 Posted 01/20/2008  10:20 am  Show Profile   Bookmark this reply Add just carl to your friends list
If your camera has high megapixels such as 7 or 8, just take the photos and crop them for the part of the coin you want in most standard photo programs for a computer. No need for photoshop, there are tons of other products that do the same. Coral has one. Many others out there.
Also, pending the camera, look at the front of the lens. If there is a treaded end you may be able to buy a enlargement filter that screws onto the front of your camera. Howver not easily available just anywhere. Usually a decent camera store or on line camera equipment organizations. Most use https://www.bhphotovideo.com for on line camera info and equipment. Order a catalog, they are free and full of info.
Another method is to acquire a magnification lens on a stand. Some with lights. Then place a coin under it and take the photos at will. All sorts available at most scientific organizations. Try https://www.sciplus.com request a catalog and check out page 40.
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 Posted 01/23/2008  4:32 pm  Show Profile   Bookmark this reply Add eaglefoot to your friends list
perhaps I should explore this forum more ! Been having problems taking pics of my coins for the first time .........don't know what I'm doing.
And once I can take a good clear pic of a coin.........not sure yet if I know how to post it here on the forum.
I've got my xd pic card now with some pics on it........ but my computer isn't recognizing it when I "plug it in". .......... So now I'm stuck again
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7123 Posts
 Posted 01/23/2008  6:22 pm  Show Profile   Bookmark this reply Add Metalman to your friends list
Eaglefoot ,,you may need to change your source info ,,I know that my photo program reads my camera on F not E which is used for my memory sticks .

what program opens when you plug in the memory card ?

Metalman

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 Posted 01/23/2008  7:19 pm  Show Profile   Bookmark this reply Add tights24 to your friends list
I know when I plug my camera into my PC I just use the supplied USB cable. I have a memory card in my camera, but I don't actually pull the card out to download anything. I plug in the cable between the two and it automatically comes up after a few seconds and asks me what I want to do. If you are using a card reader, I would imagine you just need to find the drive it is using like metalman said. You may have to access windows explorer for it to show up.
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19964 Posts
 Posted 01/23/2008  11:10 pm  Show Profile   Bookmark this reply Add BadThad to your friends list
quote:
The only pain is trying to get enough light when your that close.




Use optical zoom on the camera. I don't know why you guys don't recommend using zoom. From my experience, it's the best way to make sure you don't block any of the light. It certainly can't hurt as long as you don't use DIGITAL zoom. I used zoom on every image posted on this forum, I like changing it from 1.8 to 2.8 along with different light angles.
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Bedrock of the Community
United States
19964 Posts
 Posted 01/23/2008  11:14 pm  Show Profile   Bookmark this reply Add BadThad to your friends list
Eaglefoot, Windows should recognize it as soon as you plug it in and then turn on the camera. If not, the first thing to do is verify that USB port is working. Just plug a mouse or something into it to check. Exactly what camera is it? You do have to set the camera to PLAY after you turn it on. Always make sure the camera is OFF before you plug it in!
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 Posted 01/24/2008  03:26 am  Show Profile   Bookmark this reply Add Amazon99 to your friends list
quote:
Use optical zoom on the camera. I don't know why you guys don't recommend using zoom. From my experience, it's the best way to make sure you don't block any of the light.

I don't know if anyone is experiencing this, but when I try to use optical zoom with my point and shoot, the camera has to be quite a distance away. Then when you zoom in, you can only do so much before it gets blurry. Then when you take the photo, you only have a tiny image of the coin. That's why when I take my photos, I usually have my camera an inch in a half to three inches away from the coin. I'm guessing people with DSLRs have no problems with this.

quote:
It certainly can't hurt as long as you don't use DIGITAL zoom.

I agree, it's the devil. I have it blocked off from my camera.

quote:
I used zoom on every image posted on this forum

How far away is your lens from the coin?
Bedrock of the Community
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19964 Posts
 Posted 01/24/2008  09:33 am  Show Profile   Bookmark this reply Add BadThad to your friends list
Hummm....what camera do you have? It should come back into focus when you depress the shutter half-way. My lens distance is from 1" to 6" away. I like to be as far away as possible to let all my lights do their work.
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 Posted 01/24/2008  2:06 pm  Show Profile   Bookmark this reply Add hunter20ga to your friends list
To the OP...you've got plenty of pixels to allow you to photograph from a few inches away and then crop to nearly 1:1 to give a usable-sized and detailed image. You will have to support the camera, though, with a tripod or some other means, would be my guess in order to get the sharpness needed unless your Kodak has some form of image stabilization. If you can control f/stop, try to be between f/8 and f/11 or so, to give a fair depth of focus, and be very picky about aligning your coin and camera lens so both are in exactly the same plane.

When using my Canon 3S IS I found the super macro function to be useful, but you really have to play with lighting to get a good, even exposure because you are often an inch or less away from the coin.

Its challenging to get good coin photos...but also rewarding.

Good luck.
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