Lens Mount
Thursday, May 13th, 2010Thanks for visiting our site!
Lens Mount
Checkout Ebay Auctions For The Cheapest Prices
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 Minolta Mount Vivitar Series I 90mm 1:2.5 MACRO Lens w/Adaptor  US $199.00
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 Tamron AF 28-200mm XR Lens Sony Minolta Mount US $89.00
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 Tamron AF 28-200mm Lens Sony Minolta Mount US $30.00
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 Vivitar 28mm f/2.8 Lens for Minolta MD Mount US $29.00
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 MINOLTA 50MM MD MOUNT LENS US $9.92
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 Quantaray MX AF70-210mm F/4.0-5.6 Lens Sony Alpha Minolta Maxxum Metal Mount a65 US $59.00
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 ** B & H 1:1.9 / 1" (25mm)SUPER COMAT C-MOUNT LENS BOLEX or 4/3** US $50.00
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 50mm f/2.0 Rikenon-P Lens for K / KR mount - L5777 US $19.99
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 50mm f/2.0 Rikenon Lens for K-mount - L5779 US $17.99
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 Tamron AF 55-200 F4-5.6 Di II Lens for Sony/Minolta Alpha Mount US $65.00
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 50mm f/1.8 Cosinon-S Lens for K-mount - read - L5025 US $7.99
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 50mm f/1.9 Auto Chinon Lens for K-mount - read - L5532 US $9.99
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 Aetna-Rokunar MC Automatic Macro 28mm f/2.8 Lens Canon FL Mount US $9.95
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 **SOM BERTHIOT 1:3.5 / 75mm C-MOUNT LENS FOR BOLEX OR 4/3 ** US $51.00
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 55mm f/2.2 Fujinon Lens for M42 mount - L5568 US $17.99
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 FOCAL MC 70-210 F4.0-5.6 ZOOM LENS (FOR PENTAX PK-RICOH KR MOUNT US $29.95
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 CANON Mount 28mm f2.8 Wide Angle Lens -- Parts or Repair US $4.95
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Here are some more information for Lens Mount:
The SkyWatcher Explorer 130P is, in my opinion, a very good entry level telescope for someone who wants to get into astronomy on a fairly limited budget. Priced in the range £180 to £200 (UK Sterling), the telescope should hopefully be affordable to most people.
Unpacking and setting up the telescope was very easy - I had everything assembled within about half an hour. There is a one-off requirement to set up the latitude where the telescope is going to be used, which would only need to be re-done if you move the scope several miles from this location. The user guide provides clear instructions on how to do this.
Each time you switch on the auto-tracking Alt-Azimuth mount, the scope needs to be horizontal (zero on the mount's scale) and pointing north. This enables the scope to track objects in the sky. This is really useful because objects have a tendency to move out of the scope's field of view very quickly if you are not tracking them using a motorized mount. The only thing I don't like about the motorized mount is that the power pack does not have an on-off button, meaning that it needs to be switched on or off by screwing or unscrewing it from the mount.
The telescope has a focal length of 650mm and comes with two eyepieces (I guess this might be different in different countries) and a Barlow lens. One eyepiece has a focal length of 25mm, giving a magnification of x26 (650mm / 25mm), and one has a focal length of 10mm, giving a magnification of x65 (650mm / 10mm). The Barlow lens can be inserted in front of the eyepiece to double the magnification, giving a magnification of x52 (2 x 26) and x130 (2 x 65).
The 130mm aperture captures quite a bit of light, producing bright, sharp images. One thing to remember though is that viewing an object through a 130mm telescope is not going to produce images like those we see in books. For example, viewing Saturn at a magnification of x130 will produce an image that is about 2mm at arm's length. So, hold a ruler at arm's length and look at, say, the distance between the 150mm mark and the 152mm mark - this is how big Saturn will appear through the SkyWatcher Explorer telescope at a magnification of x130.
The highest practical magnification is x260 (2 x the aperture (130mm)), but it is really difficult to get sharp images at this level of magnification unless the viewing conditions are really good. (I bought a 5mm eyepiece which, in conjunction with the Barlow lens, gives me a magnification of x260.)
The SkyWatcher Explorer is easy to pick up and move about, which is essential if like me you store your telescope in the house. I normally use my telescope in the back garden, and I never have any problems moving it around.
All in all I'm really pleased with my purchase and would recommend the telescope to anyone who is just starting out in astronomy.
About the Author: John Dixon is a web developer working through his own company John Dixon Technology Limited. The company also develops and supplies a free accounting software tool called Earnings Tracker. The company's web site contains various articles, tutorials, news feeds, and a finance and business blog.
Digital Slr Cameras: Understanding Your Lens
it is likely that if you are looking for a new digital SLR camera it will be the very first Digital SLR (DSLR) Camera you have purchased. A lot of people are looking for a DSLR to help them take much higher quality photos than those you typically get with a standard fixed lens. What a lot of people are not aware of is that it is not only your DSLR camera that will help you on your way to becoming a better photographer, it is also your lens.
There are numerous different types of lenses, with many different abilities and functions. For photographers who are keen being on the move, their is the Fixed Focal Length Lens. This lens has a "no zoom" capability - meaning that to zoom in and out your must come closer to or move further away from your subject. In contast, a Zoom Lens enables the photographer to zoom in and out quickly and simply, bringing more or less of your chosen image into the shot.
Want a photo of that tiny butterfly with all it's colourful markings? You're after a Macro Lens. This lens gives you the advantage of taking extremely close up images, with fantastic definition and quality. If you wish to take a photo of a wide view, such as 180 degrees, you will need a Fisheye Lens. A circular Fisheye Lens can give a rounded effect to the image, if that is what you desire.
When purchasing a new DSLR camera lens you just need to be aware that different brands of cameras use different lens mounts. Before you start searching for a lens, you need to find out what lenses your camera is actually compatible with. I would strongly suggest that you visit the camera manufacturer's internet site where you should be able to find technical information on the lens specification for your camera. I also need to say that there are lens mount adapters available that allow your for example, to use a Nikon lens on a Canon camera.
Finally, there is a Lens Doubler, which is a lens that is added to another lens. So, if you have a 50mm lens on your DSLR and you add a Lens Doubler, you will wind up with a 100mm lens. When it comes time to buy your cameras lens make certain to speak to an experienced photographic professional about your precise requirements, and they will be able to suggest the correct lens to match not only your camera, but also your photo.
About the Author
For more advice on Digital SLR cameras visit our website at DSLR Camera Lenses
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can I use my praktica bayonet mount lens on my pentax k110d camera?
HI everyone
I would like to find out that if it is possible for me to use my old praktica bayonet mount lens on my pentax k mount camera. I understand that I would need an adpator and I will lose lots of funtions but since I have so many of the bayonet mount lens I really would like to use them on my new camera so I dun need to spend much on the expensive new lens. My found out that my old praktica lens is far better than the new lens in term of quility!
Hope someone can tell me if there is such adpator and if so where can I get them from? I have tried on ebay but couldn't find any result!
How about using a 2 adpators which mean I use the first one to change the bayonet mount into m42 screw mount and the 2nd one is for changing the m42 into K-mount. pls let me know if it works this way!!
thank you all!!
I think it's unlikely, but try these places:
http://www.freestylephoto.biz/
and
http://www.porters.com/
They both have free catalogs available filled with digital and analog gadgets.
Using two adapters, if they were available, to make the conversion you'd like, would probably take the lens away from where it needs to be in relation to the film plane to focus at infinity. In other words, you might be able to take pictures with the set-up, but only close-ups.
Sony Introduces World's Smallest and Lightest Interchangeable Lens Digital Cameras
SAN DIEGO, May 11 /PRNewswire/ -- Sony today introduced two innovative a (alpha) compact interchangeable lens digital cameras (models NEX-5 and NEX-3) that provide the quality of a digital SLR in a compact body that is easy to slip into a small purse or jacket pocket for ultimate portability. "Consumers want better picture quality in a smaller form factor.
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