What is the little red button on the lense on the end that screw to the camera that has a red L

Normally, these lenses do not 'unscrew'. When you push the red button, it releases the lens catch and then you rotate the lens a short ways counterclockwise, then gently pull forward on the lens while holding the body of the camera and the two units separate. It is possible you have gotten some dirt into the lens latching mechanism. Try returning the lens to the locked position, press the red button, rotate the lens to where it stops and then returning the lens to the locked position and repeat several times if the lens does not lift out when you hit the movement stop. This may allow you to get past the dirt. Otherwise, take it to a camera shop, particularly if the camera is still under Canon warranty.

keep the camera on with full battery charge, hold the camera in your left hand and whack the base with your right hand, switch on and off the camera immediately, this will if the lens has got misaligned due to knock etc

Switch off your camera before changing or removing lenses to avoid dust being attracted to the sensor
If you camera is a Canon Eos Digital Single Lens Reflex, the lens fits onto the body by being inserted into the 'hole' in the front of the body. To disengage the lens, press the button found at 4 o'clock on the body looking at it from the front and right way up. At the same time twist the lens anticlockwise and the body and lens will separate.
To mount a lens, line up either the red dots on the lens and body or the white rectangle, insert the lens into the recess and twist clockwise until you feel and hear it click home I hope this helps

It looks pretty much as battery problem, try using a new and charged one. Low charged (bad)battery can do strange things to eletronics

To remove the lens, depress the the small chrome button on the lens (below the red dot) and turn the lens assembly anticlockwise. Once the red dot aligns itself with tthe red dot below the Canon Logo, you can remove the lens.

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Answer to your question is, ‘Yes’ we can. Use Sigma FD lenses.

As we know Canon AV-1 has electronically controlled AE (Automatic Exposure) & has a Canon Breech-lock lens mount.

Original generation of FD lenses featured a silver locking ring at the base. Only that locking ring turns to lock the lens to the camera body; the lens body remains still.

In the newer lens system which was introduced with this camera, the user has to line up the red dot on the lens, with the red dot on the camera and simply turned the whole lens clockwise until it clicked into place.

Note: FD-mount cameras could use FL lenses in stop-down metering mode.

Thank you & have a nice day.

Warm regards,
William

Hey sunnibeach4,
On SLR cameras the filters are attached to the end of the lens via threads inside the end of the lens barrel. Without knowing exactly what lens you are using I can't tell you what filter diameter you need but most lenses list that information on the inside rim of the front of the lens. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

The lens needs to be removed.  The camera case can be taken apart by using a small philips screw driver and a small flat head. Take the batteries out. Have a nice flat space to lay the screws out.  Pry out the little chrome piece with the UL sticker on it. (Carefully use the flat head). Start somewhere you will remember and begin to remove the screws going clockwise around the camera.  There is a screw under the rubber flap of the "3X" chrome cover.  The top of that must be pryed out and lifted up to remove. Take the back cover off. Lift out the top of the LCD screen and remove the 4 screws that hold it in. Start a new row of removed screws. The LCD ribbon can be removed by popping the white plastic clasp up. Next remove the menu pad ribbon from the board by lightly tugging on it. You should be able to remove the front cover by lifting it up to unhook it from the top power button strip. There are 2 screws that hold the top power strip in place. There is also a plastic hook on the front side. There are 6 screws holdong the board to the frame. A different size screw is located underneath the power strip ribbon. Loosen the 2 screws holding the flash.  THe white ribbon will be the flash ribbon and the gold one next to it will be the lens ribbon. NOTICE the lens ribbon must pass under the flash.  The side with the lens will have a small board that pushes into the main board.  To seperate it, gently pry it apart with a small flathead. There is a hidden screw for the board at the top where the end of the battery compartment. It needs to be removed before the board will come out. Once the board is out, there are three screws holding the lens in the case (they are black screws, not the chrome ones)  Once they are removed, the lense will fall out. There are 3 black screws holding the largest motor on the lens.  They are above the text "Sony Lens" remove those and the gears of the lense will be able to move freely. Twist the base to get the lense unstuck.

Take the lens to a good camera shop and ask them what the mount is. They will be able to tell you what, if any, modern cameras it will fit on.

The E-500 body has a "bayonet" twist & click attachment for the lens. There is no way that a simple screw threaded lens can attach to the camera directly. The lens that you have are designed to screw into the front of the original Olympus lens. I have seen some of these adverts on auction sites and they are worded something like "The wide angle / Tele lenses are simply mounted in the front of the Olympus EVOLT E-500 / E-330 / E-300 standard ZUIKO Digital EZ 14-45mm lens, or any other lens with 58mm filter thread." Which maybe isn't clear enough. So the bottom line is that you need an Olympus lens to use the other lenses you have bought. Please update the question & let us know if the information given was useful to you - Good Luck!