What you think of this lens?

Discussion in 'Beyond the Basics' started by cbay, Oct 8, 2005.

  1. cbay

    cbay TPF Noob!

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  2. DocFrankenstein

    DocFrankenstein Clinically Insane?

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  3. cbay

    cbay TPF Noob!

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    Well they arent sure, i would like to see some images taken with this lens anyone any ideas where to find anyone with this lens??
     
  4. darich

    darich TPF Noob!

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    Almost every post on the other forum slated that lens.
    My first thought is that any lens with a minimum aperture of f/8 can't be up to much.
    I'm sure someone in here could give you the more technical details but remember the general rule is shutter speed = focal length so can you imagine trying to get f/8 at 650mm (x1.6 = around 1:1250 for most DSLRs).It would be even worse at the long end where focal length is 1300mm (shutter speed of around 1:2100 on a DSLR) and that's at f/16.
    Use a 2x extender on that and you might even be beyond the limits of your camera!!!!

    As someone in the other forum pointed out - it looks like a toilet roll with coke bottles for lenses!!!! :lmao:
     
  5. 'Daniel'

    'Daniel' TPF Noob!

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    That lens is scary! :meh:
     
  6. Mitica100

    Mitica100 Moderator Staff Member Supporting Member

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    OK, you might not like this but...

    I went on the Opteka web site and wanted to know more about the company. They don't have any info as of yet. Fishy? I dunno...

    Considering the rare times you're going to use it, wouldn 't you be better served by renting a high quality lens?

    Just my 2 cents...
     
  7. thebeginning

    thebeginning TPF Noob!

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    dont buy it.


    you wont be able to autofocus with it, it's a no-name brand, and it's f8 for goodness sakes. i made the mistake of getting something similar a while (long while) back. i never use it.

    there is a reason why it's so cheap.
     
  8. darich

    darich TPF Noob!

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    Where it describes the focus modes it only says "manual focus".
    As just posted...no autofocus
     
  9. thebeginning

    thebeginning TPF Noob!

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    also, cant the 350d not autofocus with lenses that have a smaller aperture than 5.6? not that there even are any, really...
     
  10. FuddyDuddy

    FuddyDuddy TPF Noob!

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    Hello,

    I doubt you would use it more than once. Might make a nice doorstop though.:lmao:

    F. Duddy
     
  11. 'Daniel'

    'Daniel' TPF Noob!

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    Or replacement for a table leg :lmao:
     
  12. usayit

    usayit No longer a newbie, moving up!

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    Same lens is marketed under spiratone, samyang, and pheonix ( in the US ).

    http://www.pcaol.com/product.cfm?ProductID=437

    Basically a telescope with a T-mount. From what I recall, its barely useable.
    Google those brands and you should find some input.
     

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