I just got a Sony DSC-H1 not too long ago and just love it! I'm now looking at some telephoto and wide angle lenses to add to it and was hoping someone could help me out.
How good are the (expensive) Sony lenses? I also saw some (more affordable) lenses on eBay: Opteka 2x Telephoto, .45x wide angle, etc. Has anyone purchased any such lenses on eBay, and if so, what did you think about them?
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You just need any Minolta AF mount lens. Sony Alpha lenses also physically fit as Sony inherited the Minolta lens mount when they bought the company, but as they are a later development not all will be electronically compatible.
The size of the lens depends upon the focal length of the lens and you choose that according to how wide a field of view you desire. Typical lenses are 28 and 35mm wide angles, 50mm "standard" (approximately the same perspective of how the human eyeball sees images), 70 to 90mm short telephoto lenses (a narrower perspective and very good for portraits) and higher numbers are narrower perspective telephoto lenses for viewing increasingly distant objects. In practice, the available lenses will be incorporated into zoom lenses which incorporate a seamless range of focal lengths within one single model. The word "zoom" reflects the fact that you can seamlessly change from say 28mm wide angle through to 80mm short telephoto and every single setting between them
Any zoom which starts at less than 50mm and finishes in the short telephoto range is called a standard zoom and is the lens that most autofocus cameras were supplied with. The next most common size will be something like a 70-200mm which is a telephoto zoom (or tele zoom) and takes you from a portrait lens to a genuine 5x magnification telephoto. You may also find so-called "super zooms" which do the whole job on one, for example 28-200mm. but the more jobs a single lens tries to do, the bigger and bulkier it becomes and the image quality deteriorates due to poorer contrast and greater image distortion at each end of the zoom range.
This is not an exhaustive answer, as there are entire books on the subject, but hopefully it's been of help to you.
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You can also get a 1.4 or 2x teleconverter to further increase the power of a telephoto lens. However, the cameras are unable to auto-focus when the minimum f-stop exceeds f/8, which can happen when you use one (or both) of the teleconverters on these longer lenses, so you have to manually focus the lens.
You can also get telephoto lenses from other manufacturers such as Tamron and Sigma that are built to work with Canon cameras. However, the Canon lenses are generally regarded as the best quality.
There are lenses available to add with an adapter ring. I have the wide angle lens (which I LOVE) and a 2x telephoto lens. The wide angle lens allows me to macro from several feet away. It is an amazing lens. The telephoto lens is something you really need to use with a tripod. But yes, there are lenses you can add to your camera.
Congratulations on the aquisition of such a great vintage camera!
Pentax cameras use a mount known as M42. This means it is a 42 millimeter diamater. You may also find this referred to as the Pentax mount, as Pentax (Asahi Optical) made this popular in the United States. With any camera, any lens you purchase should match the mount of the camera in order to be used together.
With the telephote lens, I am assuming that the camera is a bit more sensitive to any form of camera shake. My suggestion, when using the telephoto lens, is to manually set the shutter speed to its fastest setting (that, or set it to "sports mode"). Also, experiment with the telephote lens using your tripod. Set the camera up on a table and use the timer so that the camera will snap the image automatically. See if the picture is still blurry. If you don't have a tripod, just place it flat on the table.
That's completely normal for those cheap wide angle add on lenses. There good for a little fun but nothing serious. I bought the lens kit for the Kodak DC3400, probably the exact same lens.
The telephoto in that kit was actually pretty reasonable though.
The built-in lens "all-in-one" designed to be digital, which means it is specifically matched to the CCD. Cameras offering interchangeable lenses are designed for 35mm film, which usually does not have sufficient resolution for a Megapixel CCD sensor. When interchangeable lenses are removed from the body, the CCD and internal mechanisms are exposed to dust in the environment. Contaminants are a much bigger problem on digital cameras since the CCD is much smaller that a 35mm film plane.
One of the primary reasons for using interchangeable lenses is for a wide variety of focal lengths. The E-20N contains a 4x optical zoom 9mm-36mm (35mm-140mm equivalent in 35mm photography) built-in lens. In addition, there are wide angle, telephoto and macro add-on lenses. Some interchangeable lenses cost as much as the E-20 camera itself. Other lenses that were originally designed for film cameras do not deliver same focal length on a film camera as a digital camera. For example, a wide-angle 28mm lens attached to a digital camera would only provide 56mm equivalence.
This system offers great flexibility and will suit approximately 95% of most shooting needs.