A Pentax camera lens is special because of its perfect compact efficient design for the Pentax cameras. They have the digital camera sensors and autofocus which gives you the very best performance for a great price.
Pentax K-mount lenses. http://en.wikipedia.org/wiki/Pentax_K_mount#List_of_Lenses_with_any_K-Mount_Variant
some Pentax models-check magazine ads.
If you use the kit lens there isn't one. It's done by revolving the wheel at the back of the camera. Camera feeds the message into the lens after you switch to manual. If you use an older lens then u are able to manually adjust aperture on the lens, in manual mode of course.
No, unless you make an adapter for it. Surprisingly, the Nikon bayonet lens will fit the Pentax K body. Only loosely. Infinity is incorrect but if you handle it carefully, you can take a picture with it.
A Pentax H1a is worth between five dollars and $200. The price of the camera depends on what condition the camera is in, as well as the age of the camera.
A Pentax 67 is a high quality camera that produces great photographs. One can purchase a Pentax 67 online from eBay, Samy's Camera, or from BHPhotoVideo.
All Pentax DSLRs are compatible with all K-mount Pentax lenses, which is to say all of them back to the 1970s or thereabouts. I routinely use a f1.2 50mm lens from a K1000 on my K10D. The A3000 had shutter-preferred capability, so your K200D should operate the aperture in the lens. Obviously many features, such as autofocus, will not function since the lens does not have the autofocus motor. Keep in mind that your K200D viewfinder will not show the entire field of view on the shorter lenses, as it is set up to work with a sensor that is 1/3 smaller than a 35mm negative. This isn't really a problem. Telephoto lenses will work just fine.
There is many different stores online in which you can purchase this type of camera. You can buy a Pentax DSLR camera in multiple online stores. One of which is Currys.
Pentax Camera Accessory is a website that has equipment for Pentax cameras. eBay is a good source as well because most retailers no longer carry old fashioned film camera equipment. Also, try Amazon.
It is not recommended to use a different model camera lens on a camera. Camera's and accessories such as camera lens are made by manufacturers to support their own products. Use of an sony camera lens on a differen model camera may void the warranty.
Most lenses and mounts are proprietary so no Canon lens would fit a Pentax without some kind of adaptor.