hi, i dont know if any knows anything much about the pentax fit lenses but im looking for a zoom lens for my pentax k200d. i have the kit lens 55-200mm. i would like to get that up to 300mm if possible. looked at the pentax 55-300mm and the tamron 70-300mm. anyone had any experience with these? thanks.
Sorry, I don't have much experience with Pentax lenses, but I'm sure the Pentax would probably be the better bet over the Tamron as long as your budget can afford it.
However, if it were me I would rather upgrade to the fast Pentax 55-200mm f2.8 over your slow 55-200mm f4-5.6 kit lens. For me, the brighter lens would give far greater shooting advantage than the extra 100mm zoom range. But, I don't know exactly what you're shooting, or from where... ;)
Hmmm... I must've read some numbers wrong there, somewhere. I do see a Pentax 50-135mm f2.8... Or maybe it was the Tamron I was thinking of. There's a Tamron 70-200mm f2.8 as well, which wouldn't sacrifice any of your telephoto zoom range to get the same brightness.
Pentax lenses don't seem to have much of a web presence, to they? Really tough to look up the line...
It turns out their only wide aperture zoom lenses include the 16-50mm f2.8 and 50-135mm f2.8, and all the rest of the wide aperture lenses are primes.
Now, if it were me the 135mm focal length would be sufficient to get out of a fast lens, but we all shoot a little different and our needs are different. If you find you're using the longer range, the 70-200mm f2.8 Tamron sounds like a good deal (A quick lookup seems to show that as being Tamron's longest wide-aperture zoom lens).
I haven't had personal experience with any of these lenses, but I'm just going by what I've found for myself to be the most useful features of various lenses. Personally, I have a telephoto zoom lens that's a sluggish f4-5.6. I hardly ever use it, and it just sits in my lens pouch because I'd rather use my bright wide-angle f2.8, even if I have to crop the shot after.
At a slow speed and long range, you can't really shoot anything without first carefully setting up the shot for a tripod.
Pentax does not really promote themselves as strongly as Canon and Nikon do. The only people who use Pentax stuff it seems are the ones who used them as film cameras and are used to their product. I have all of my old lenses from my 35mm camera that are usable on the new DSLR's, including a zoom that goes to 300mm. Try ebay first, but it is not as easy as getting stuff for Canon and Nikon, their market share is much greater.