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I need a manual for Tamron Camera Lens 28-200/3.8-5.6

Please help. The lens also says IF and LD and AF Aspherical

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  • carolo Jan 19, 2009

    Thanks. I'll download it and see if it may apply.
    But I have the 28-200 3.8-5.6 AF Aspherical LD.

  • carolo Jan 19, 2009

    That's it!! Thanks! But now I have another question. I was hoping to find the answer in the manual, but I don't see it.

    I'm reading a book about correct photographic exposure. This section is telling how to figure hyperfocal exposure. "You would first choose to set your aperture to f/22 and then align the distance above your distance-setting mark on the lens. Your focal length will determine which distance you choose." ???? I don't know how to do this. Can you help explain this procedure.

  • carolo Jan 19, 2009

    Sorry to be so dumb. But, if the aperature is set to f/22, what on this image above tells me that the shown settings are correct for f/22? I don't see f/22 shown anywhere? (I can use this info on another lens.)



    So how does the distance scale on the Tamron lens work? I can't figure out a correlation between the numbers on the ring, and the numbers on the barrel.

  • carolo Jan 19, 2009

    So simple! ... and yet I never knew how this works. I've never read this explanation anywhere.



    But now, to the second part:



    How does the distance scale on the Tamron lens work? I can't figure out a correlation between the numbers on the ring, and the numbers on the barrel.

  • carolo Jan 20, 2009

    so the numbers on the Tamron lens have no purpose at all? And I've been obsessing trying to figure them out!

  • carolo Jan 23, 2009

    Thank you!!

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You didn't supply what kind of Tamron lens it is. I'm gonna go ahead and give it my best shot on a guess: Tamron 28-75mm f/2.8 XR Di LD Aspherical (IF).
If I'm correct, you can download the manual here: http://www.tamron.com/assets/pdfs/A09.pdf
Hope this helps!
/Chris

Posted on Jan 19, 2009

  • 3 more comments 
  • Christoffer Wallstenius

    I See. I found the correct manual for your lens. You can go ahead and download it here: http://www.tamron.com/assets/pdfs/A03.pd...

  • Christoffer Wallstenius

    I can explain the procedure, but unfortunately, it will not work very well with your lens.



    Hyperfocal focusing is not really a matter of exposure, it's a  trick to maximize the Depth Of Field in a picture, to be able to take pictures without having to re-focus between each frame.


    First, set the lens to manual focusing, so the AF doesn't mess upp the Hyperfocal focus. Next, you need a lens with a Distance Scale and a DOF Scale (Depth Of Field scale). The distance scale normally shows both feet and meters, and is the part of the scale that rotates when you focus the lens. At the far right end of the distance scale, there is an infinity-symbol, which looks just like the numer 8 on the side. 




    This is a Distance Scale with DOF Scale. The DOF Scale are the number 22 16 8 || 8 16 22


    The lens in the picture is actually hyperfocal focused, if the aperture is set to f/22.


    The way to read the distance scale and DOF scale is this:
    The numbers to the left hand side of the center mark in the DOF Scale represents the Near DOF Limit, and the numbers on the right hand side of the center mark represents the Far DOF Limit. Hence, if the lens in the picture is set to f/22, the Near DOF Limit would be at about 12 feet, or 4 meter. The Far DOF Limit is at infinity, i.e. the horizon. This is the deepest possible Depth Of Field at this aperture. And that is exactly what Hyperfocal Focusing does, it gives you the deepest possible Depth Of Field for a given aperture setting. 


    Unfortunately, since your lens does not have a DOF Scale, it's a little bit more tricky to use Hyperfocal Focusing. Basicly, it's a guesswork. 


    I hope this helps you!


    /Chris





  • Christoffer Wallstenius

    Is only say 22, which means f/22. Above the both numbers 22, there are white "arrows" pointing to the correlated distance figures. If the lens in the pictures was set to f/16, the Near DOF Limit would be a little more than 12 feet, around 15 feet, because the number 16 on the left side of the center mark points just to the right of the 12ft/4m mark. On the other side, we can see that the f/16 marker points to somewhere between 25ft/8m and infinity, I'd say around 20-30 meters. (The Distance scale is not linear, therefore a mm on the right side of the scale represents a much larger distance than a mm on the left side of the scale).


    So what you do is that you set your lens to a desired aperture. Then you turn the focus so the infinity-mark correlates to the mark for the aperture you chose. That's all you have to do to Hyperfocal focus. However, if you want to know how near the Near DOF Limit is, i.e. how close subjects will still appear sharp, you look at the distance figure that correlates to the f/stop marker on the left side of the DOF scale.

  • Christoffer Wallstenius

    Thats the problem, your Tamron lens doesn't have a DOF Scale. There is no correlation between the numbers on the Aperture ring and the Distance Scale.


    What you could do, however, is to use a program called f/Calc to calculate correct distance setting for different aperture settings. You would however have to create a table for different focal lengths and different apertures, since the hyperfocal distance changes with focal lenth as well as with the aperture. But if you made a table for example 28mm, 50mm, 80mm, 100mm, 135mm, 150mm, 200mm, 250mm and 300mm, thad would probably be accurate enough. You don't have to worry about hyper focal distances for apertures larger than f/11 (i.e. smaller number). f/11, f/16, f/22 and f/32 would be acurate enough. Thats a total of 36 numbers though, so it's not all that convenient. Thats why the Distance Scale with DOF Scale is such a good thing!


    /Chris

  • Christoffer Wallstenius

    Sorry, I missed your previous comment. No, they don't really fill a purpose, more than indicating at what distance the lens is focused. The problem with zoom lenses is that the DOF scale is not linearly related to the focal length. A shorter focal length gives a wider DOF, if the distance is unchanged. So either the distance scale or DOF scale have to be modified when the lens is zoomed, and cheaper lenses do not incorporate this function.


    I hope you are satisfied with my answers!


    Regards, 


    /Chris

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