What is this??

Discussion in 'Photography Beginners' Forum' started by Snakedudeman328, Nov 25, 2006.

  1. Snakedudeman328

    Snakedudeman328 TPF Noob!

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  2. usayit

    usayit No longer a newbie, moving up!

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    Preset as in the aperture is set manually.. the preset aperture is usually slow... f/11, f/8 for example.

    Using such type of lenses is like attaching you camera to a regular telescope.

    If you want to look further... check out phoenix, samyang who make similar lenses. Another type of lens to consider is mirror lenses which have their own limitations but are a bit more compact.
     
  3. Snakedudeman328

    Snakedudeman328 TPF Noob!

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    sweet. Will that lens I posted work for my Nikon D100??? So that lens can zoom very very very well huh?? If it can than why is it onle a 100 bucks?
     
  4. Johnboy2978

    Johnboy2978 No longer a newbie, moving up!

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    b/c as the previous poster noted, it's verrrry slow. It has an aperture of f/8-32 so it will be of limited use. Basically shooting stationary things under a decent amount of light and with a fair amount of grain. You're basically going to be limited to using it during the middle of the day or at night with bulb exposure.
     
  5. Mad_Gnome

    Mad_Gnome TPF Noob!

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    That lens isn't a zoom lens. It is a prime lens, meaning it has one fixed focal length. It is a 500mm lens, and there is an available matched teleconverter that would make it a 1000mm lens. It is a T-mount lens, which has adapters available to mount it to any kind of camera, although it is manual focus only. There are three drawbacks to this particular lens, if the fixed focal length isn't also an issue. (Considering how often you mention zoom, I'm guessing it is.) First is its sheer size. The lens is over a foot long WITHOUT the teleconverter, and it is nearly 3" in diameter. Second, the minimum aperture is f/8, which means it is relatively slow. This particular lens is intended for bright outdoor photography, however, so that isn't necessarily a limiting factor. Last is that it is made by Quantaray, a company not particularly known for high quality glass. This, coupled with the $99.99 price tag would be an indicator to me that it is a fairly cheap piece of glass, and you would probably be disappointed with it.
     
  6. benhasajeep

    benhasajeep TPF Noob!

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    It is basically a telescope. I borrowed one from a different brand (this is labeled by about 8 different brand names). Anyway the center of the picture is actually pretty good (crop to just the center and get good pics). It does not have any corrective lenses in it to control distortions or coating to control flare / reflections. It is fairly light (due to very little glass in it). If you want a long focal length lens you also might look for a CAT lens. The cheap ones are also in this price range. They are a fixed aperature though normally f8. But they are only about 4" dia and 4" long.
    Both types are very slow and need bright light.

    To use it on a digital camera you will be in FULL MANUAL mode only! Not even metering will work with it (lower end models, not sure about D2's).
     
  7. Innocence

    Innocence TPF Noob!

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    snakedudeman, it doesn't zoom at all. its just very zoomed in - and you can't zoom out.
     
  8. JIP

    JIP No longer a newbie, moving up!

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    I worked for Ritz, do not waste your money. Quantaray/Sigma make some good lenses but this one is a piece of crap. Many have been sold at my store only to be later returned.
     
  9. fmw

    fmw No longer a newbie, moving up!

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    For the record, preset doesn't mean the aperture is set manually. It means that the lens is not indexed for maximum aperture metering and exposure. With a modern indexed lens you view, meter and fire the shutter with the diaphragm open wide. The lens then stops down to the taking aperture automatically for the exposure and then opens up for viewing the next shot. Metering is done with the lens wide open and is indexed to the aperture.

    Preset lenses don't do this. They need to be stopped down for metering and for taking the exposure by the photographer. So the fancy ones have an additional ring to allow the photographer to switch between maximum aperture and taking aperture without looking at the lens barrel. The aperture is "preset" and the photographer can stop down to it using this ring.

    Also, it has nothing to do with maximum aperture. Virtually all lenses were made this way in the past. Auto indexing appeared only after in-camera metering appeared - 1960's.
     
  10. jwkwd

    jwkwd TPF Noob!

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    The saying " You get what you pay for " comes to mind.
     
  11. Snakedudeman328

    Snakedudeman328 TPF Noob!

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    Alright. I will try it out next time I go to Ritz to see how it is. Whats a teleconverter?? And also where are the better lenses like this for a cheap price?


    thanks
     
  12. benhasajeep

    benhasajeep TPF Noob!

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    First you have to take into consideration in price when you look at these lenses. You get what you pay for is true. A $100 lens the same focal length as a normally $6,000 lens will perform way below. Now if you can live with the pictures thats fine.

    When I was in college I bought a cheap $99 cat lens. 500mm f/8. Nice lens to look through. But thats about it. Any picture from it had noticeable grain. And if you put an extender on it. Even worse. Was not too bad for moon pictures (would make sence as its a design used in telescopes). Nikon makes a better version of the 500mm f/8 and of course it costs a bit more. But it also had coatings on the glass and put out a better picture. Again you get what you pay for.

    If you are looking for something cheap to play around with. Thats fine. But don't expect crystal clear pics of an eagles eye from 100 yards away.

    A tele extender is an add on lens that extends the focal length of the lens infront of it. There are several sizes. 1.4x, 1.5x, 1.7x, 2x, 3x. Now again there are some really cheap ones that have cheap glass and just magnify (increase) faults in the main lens. As well as adds it own. Good ones are made as well. but again the cost factor comes in. There is a penalty for using extenders. They reduce the light that reaches the film / digital sensor.
     

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