HELP, With Choosing A Lens!!......please?

Discussion in 'Digital Photography' started by SolracSelbor, Mar 4, 2008.

  1. SolracSelbor macrumors 6502

    Nov 26, 2007
    I hope I got your attention :D

    Im looking for a telephoto lense in about the 300-400$ price range for a Pentax. Im really not sure what to look for and I dont really know what zoom I am looking for either. I was thinking that maybe 300mm would be good enough for most photography, but Im not really sure. I have never bought a lens besides the kit lens which so far is serving me fine.

    Initially I thought that maybe the Pentax SMC P-DA 18-250 MM F/3.5-6.3 ED/AL (IF) Zoom Lens, but people are saying it may be too slow. But then, what is an ideal aperture that overall good and not expensive.


    Can anyone tell me if these 2 lenses are the same, or if one is better than the other:

    Pentax SMC P-DA 18-250 MM F/3.5-6.3 ED/AL (IF) Zoom Lens

    Tamron Zoom Wide Angle-Telephoto AF 18-250mm f/3.5-6.3 Di-II LD Aspherical IF Macro Autofocus

    Any suggestions? Anyone?
  2. jpfisher macrumors regular

    Dec 5, 2006
    New Jersey
    The Tamron and the Pentax 18-250mm are the same lens -- Pentax is simply putting their logo on the Tamron lens.

    There are always going to be compromises in quality when looking at a superzoom such as the 18-250mm. You may want to consider something to complement your 18-55mm kit lens.

    The 55-200mm is the companion to the kit lens, and is more reasonably priced than the Tamron/Pentax superzoom solution. It is set to be replaced this summer, but a 55-300 f/4-5.8 zoom. That will be hitting at a higher price point (over $500), and is not available yet of course.

    There is also a Pentax 60-250mm f/4 that should be out this year, but that will almost certainly be more expensive than the 55-300mm.
  3. SolracSelbor thread starter macrumors 6502

    Nov 26, 2007
    Whats a reasonable speed for a zoom lens?
  4. cube macrumors P6

    May 10, 2004
    I have a relatively old Nikon AF Nikkor 70-300mm f/4-5.6D ED and it's very usable.

    I haven't used it for sports, but it can deal with an airshow on a sunny day (of course on full frame and I guess even on crop it's too short except for the flybys). The autofocus of this lens is not great for that.
  5. jpfisher macrumors regular

    Dec 5, 2006
    New Jersey
    Pro zooms are generally f/2.8 constant, prosumer f/4, and consumer usually have a variable aperture -- f/3.5-5.6 or f/4-5.6 is pretty common. Take a look at the pricing between the Pentax 18-55mm kit lens (f/3.5-5.6), the prosumer 16-45mm f/4, and the pro 16-50mm f/2.8 -- that's a pretty good indication of how the line works with price:performance in the Pentax system.
  6. SLC Flyfishing Suspended

    SLC Flyfishing

    Nov 19, 2007
    Portland, OR
    Tamron has a 70-200 mm f/2.8 that should be hitting the shelves soon. It's not going to be more than $600, which I think is a great price for a constant f/2.8 through to 200 mm. I'm prepared to shell out $1,200 for Pentax's DA* 200 f/2.8 prime!


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