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Old May 30, 2003, 10:50 PM   #1
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Default use a tele extender without threads on the camera?

I have a question which may be naive but I'll ask it anyway. I'm going to be buying the Fuji Finepix F 700 when it comes out. I notice from the pictures that it has no lens threads. Is there any way to add a tele extender or wide angle extender to such a camera? For example, fabricate a connection between the lens and camera or hand hold the lens on the camera?
Richard
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Old May 30, 2003, 11:17 PM   #2
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You should ask in the Fuji forum to get a "more correct" answer. Here is my guess.

I believe the Nikon CoolPix 5700 doesn't have threads either. It uses what is called an "extention tube" which has threads on the end. It is like a sheath which goes over the lens and you screw the teleconverter on to that (or a wide angle lens, or a polarizer... or any filter which matches the size.) One reason for this could be that the lens isn't designed to take the added weight of the TC.

Look to see if Fuji makes a TC for that camera. If it does, look to see if they say that a "tube" is required, or is sold with it. Then you have your answer.
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Old May 31, 2003, 3:41 AM   #3
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Default Re: use a tele extender without threads on the camera?

Quote:
Originally Posted by rmorrill
I have a question which may be naive but I'll ask it anyway. I'm going to be buying the Fuji Finepix F 700 when it comes out. I notice from the pictures that it has no lens threads. Is there any way to add a tele extender or wide angle extender to such a camera? For example, fabricate a connection between the lens and camera or hand hold the lens on the camera?
Richard
http://www.fujifilm.com/JSP/fuji/epa...00Brochure.pdf is a pdf file directly from Fuji. You are right, Fuji's Finepix F 700 will not support a telephoto or wideangle lens. If that is what you are interested in, you'd best look at others, for example, the Sony 717 and don't get all wrapped up in the idea of 6 megapixels when most of us rarely use more than 2 for our daily picture work. Think about it, this is not like horsepower. What Fuji, and others will do, is to keep pumping up the megapixels which, in the final analysis, is useless to the average user.

A full on 6 megapixel CCD picture is enormous, with Fuji, their top size will get you only 9 photos on a 128 card, standard 6 megapixel will get you 85.

My biggest regret in purchasing a Fuji 6800 is that I was not savvy enough to realize that it would not support genuine TC and WA like my Sony S75. There are snap on adapters, but that is just a mickey mouse contraption afterthought which attempts to overcome poor design.

Good luck.
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Old May 31, 2003, 4:01 AM   #4
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Default Re: use a tele extender without threads on the camera?

Quote:
Originally Posted by rmorrill
I have a question which may be naive but I'll ask it anyway. I'm going to be buying the Fuji Finepix F 700 when it comes out. I notice from the pictures that it has no lens threads. Is there any way to add a tele extender or wide angle extender to such a camera? For example, fabricate a connection between the lens and camera or hand hold the lens on the camera?
Do worry too much about this. Take a look at the "Wideangle Telephoto, etc" page (and perhaps the "Polarizer" page) of my Nikon Coolpix 2500 user guide, and you will find out that after some getting used to, you will be able to hand-hold a lens in front of your camera. Tedious? Yes, but doable.

CK
http://www.cs.mtu.edu/~shene/DigiCam
Nikon Coolpix 950/990/995/2500/4500 user guide
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Old May 31, 2003, 4:01 AM   #5
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Quote:
Originally Posted by eric s
You should ask in the Fuji forum to get a "more correct" answer. Here is my guess.

I believe the Nikon CoolPix 5700 doesn't have threads either.

The Nikon most certainly does have threads which receive the extension tube. The camera body has female threads and the tube screws into it, being male threaded.


It uses what is called an "extention tube" which has threads on the end. It is like a sheath which goes over the lens and you screw the teleconverter on to that (or a wide angle lens, or a polarizer... or any filter which matches the size.) One reason for this could be that the lens isn't designed to take the added weight of the TC.

The real purpose of the "extension" is to give the camera's zoom lens room to move out to full length, thus the term "extension"
This will, of course, allow adaptation of different mm sized wide angle and telephoto lenses such as Kenko, Tiffen and Raynox to then adapt to your needs.


Look to see if Fuji makes a TC for that camera. If it does, look to see if they say that a "tube" is required, or is sold with it. Then you have your answer.

Often, when you buy a new camera so equipped, the vendor will try to sell you UV filters or other kinds of filters. They will tell you that you have to have the adapter ring and the type that it is and you should always find out what the mm diameter is so that you will be ready for the WA or Tele lenses.
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Old Jun 1, 2003, 1:03 AM   #6
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pjallittle

The question was about threads on the lens (or the lack there of.) The 5700 doesn't have threads on its lens. I completely agree that the 5700 has threads on the body to take a tube. My point was to use it as an example of a camera that uses a tube. Next time I will be clearer.
Quote:
Originally Posted by pjallittle
The real purpose of the "extension" is to give the camera's zoom lens room to move out to full length, thus the term "extension"
I don't agree. If the lens has threads on the end, then you could add a TC directly to the lens and you could still move the lens to its full zoom length. Your argument doesn't hold water. The purpose of the tube isn't to allow the zoom to fully extend, itís there because Nikon felt it was a better way to attach a TC/whatever. ("Better" being defined by Nikon; anywhere from "the lens can't take the weight" to the paranoid "Hey, we can make more money on accessories by requiring an extra item (a tube!)" I'd rather believe the first answer over the second, but in the absence of more facts... who really knows?) I would say that the length of the tube is chosen to allow the lens to extend to its full zoom length. But that isnít the purpose, just a design element.
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Old Jun 1, 2003, 1:20 AM   #7
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error, see next entry
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Old Jun 1, 2003, 1:20 AM   #8
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pjallittle wrote:
The real purpose of the "extension" is to give the camera's zoom lens room to move out to full length, thus the term "extension"

I don't agree. If the lens has threads on the end, then you could add a TC directly to the lens and you could still move the lens to its full zoom length. Your argument doesn't hold water

Making a semantical argument is silly, in one camera's case it isn't an extension in the terms which I put it but in many it is the case. The fact is that an extension tube to which a WA or TP lens is attached is often required specifically to enable the zoom lens to extend from the body of the camera.

I did not invent this explanation, I am going specifically upon the information given to my by the technical specialists who work for the companies who manufacture these items. Among others, it is the explanation that they give. Likewise the fellows who sell them at the retail level.
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Old Jun 1, 2003, 2:10 PM   #9
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Default Re: use a tele extender without threads on the camera?

CK, Thanks very much for your excellent web page and discussion of hand holding a converter. It is now clear to me that it can be done and the pics look surprisingly good. One exception is the pic with the 2x telephoto converter. It is sharp in the middle and more blurred around the outside. Do you think this is due to the type of lens used or from lens shake?
Another possible answer is a "camera adapter". It is a bracket that screws onto the camera tripod threads and fits in front of your lens and accepts various converters. The only problem is that it is only made for certain cameras. It might possibly be adapted in some way for my camera. See: www.ckcpower.com/adapters.htm

Another possibility would be to hand hold the converter in front of your camera by pressing it up against the camera's lens and fashioning some kind of guide strips on the converter out of a rubber like material so the converter is easily centered in the same way each time. This is just speculation. Do you think it would help?
Thanks again, Richard.



Do not worry too much about this. Take a look at the "Wideangle Telephoto, etc" page (and perhaps the "Polarizer" page) of my Nikon Coolpix 2500 user guide, and you will find out that after some getting used to, you will be able to hand-hold a lens in front of your camera. Tedious? Yes, but doable.

CK
http://www.cs.mtu.edu/~shene/DigiCam
Nikon Coolpix 950/990/995/2500/4500 user guide[/quote]
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Old Jun 1, 2003, 5:19 PM   #10
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Default Re: use a tele extender without threads on the camera?

Hi Richard,

Quote:
Originally Posted by rmorrill
One exception is the pic with the 2x telephoto converter. It is sharp in the middle and more blurred around the outside. Do you think this is due to the type of lens used or from lens shake?
IMO, it is always the case. The rear element of a converter and the front element of the camera lens must maintain certain distance to yield the best result. This "certain" distance is needed to maintain matching view angles, magnification, non-vignetting, etc. When we hand-hold a converter in front a lens that does not have a lens thread, it means that the converter and the camera lens may not be matched perfectly and those factors mentioned above may not be maintained completely. As a result, image quality will not be as high as the one obtained by a matching converter. A high quality lens converter will minimize this problem but may not be able to eliminate it. The center portion of a converter is always better than the corner area. This is the reason in your images (and my images at the 2500 site) the corner area is not sharp as the center one.

Quote:
Originally Posted by rmorrill
Another possible answer is a "camera adapter". It is a bracket that screws onto the camera tripod threads and fits in front of your lens and accepts various converters. The only problem is that it is only made for certain cameras. It might possibly be adapted in some way for my camera. See: www.ckcpower.com/adapters.htm
I am not aware of such an adapter for your Fuji, It could even be more problematic because compact cameras such as your Fuji have telescopic lenses that could extend out. This makes making an adapter very difficult. It is almost a camera-by-camera case.

Quote:
Originally Posted by rmorrill
Another possibility would be to hand hold the converter in front of your camera by pressing it up against the camera's lens and fashioning some kind of guide strips on the converter out of a rubber like material so the converter is easily centered in the same way each time. This is just speculation. Do you think it would help?
Yes, yes, yes, this may be the easiest way to go. A film container may be a start,

CK
http://www.cs.mtu.edu/~shene/DigiCam
Nikon Coolpix 950/990/995/2500/4500 user guide
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