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Old Oct 1, 2010, 4:31 AM   #11
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Quote:
Originally Posted by mtngal View Post
While the 55-300 is a nice, light-weight lens and I have a good one, it doesn't match the quality/sharpness of the 50-135. I think if you want a zoom the Sigma 100-300 sounds like a good choice. The 60-250 is a brilliant lens, very sharp but I found it heavy and it is expensive. Depending on how and where you stand, the DA*300 could work, and its certainly an awesome lens. I love mine.
If you find the 60-250mm too heavy what about the Sigma 100-300 mm which weights 300gr extra

Could you find me a good reason why i should buy a Pentax 300mm/4 instead of the Sigma 100-300mm/4
Ok the Pentax will be 400gr lighter but i get to shoot only at 300mm , i'd have to choose a sweet spot and i don't have much room for changing perspectives
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Old Oct 1, 2010, 4:49 AM   #12
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Originally Posted by jelpee View Post
You may have a tough time buying a new Sigma 100-300f/4...I understand it is no longer in production.

Have you thought about the Sigma 70-200 f/2.8 + a teleconvertor? Unfortuantely, Pentax does not make a 70-200 f/2.8, but I hear that the Sigma is an excellent performing lens.
Mmhh , would this give me a quality similar to a 100-300mm at 300mm focal

I've allready got the 50-135mm range with my Pentax , if i would consider a teleconverter then it would maybe be better that i buy the Pentax 200mm f/2.8 which is going to be much smaller and lighter .

Could someone tell me which would give the best result between a Sigma 100-300/4 & Pentax 200/2.8 + teleconverter

Yeah this seems to be a good option
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Old Oct 1, 2010, 2:41 PM   #13
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Here's how I think it works out, assuming no TC.

All 3 lenses are well liked by their owners. This means you'd end up with a good lens, but maybe not the best for your particular purposes. There's weight differences (60-250 being the lightest, as I recall), size differences and handling differences. They may or may not affect you at all, that's a personal thing.

All photography is a compromise, and you are going to have to compromise somewhere. If size, weight and handling don't matter, I think it comes down to this:

Sigma - zoom and has the reach. Compromise is no weather sealing and you'll be working in a dusty place.

DA*60-250 - weather sealing and zoom. Compromise is the reach.

DA*300 - weather sealing and reach. Compromise is the zoom.

What are you more willing to compromise - weather sealing, reach or zoom?
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Old Oct 1, 2010, 6:45 PM   #14
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These were all shot with the Pentax 55-300. Not bad for a cheaper lens, and mine had a de-centering issue at the time.
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Old Oct 1, 2010, 6:53 PM   #15
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notice in your sig your shooting a k-x that means weather sealed lens is kinda irrelevant since the camera isn't sealed - so the sigma might be a more obvious choice specially if its cheaper
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Old Oct 2, 2010, 2:07 AM   #16
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Originally Posted by John.Pattullo View Post
notice in your sig your shooting a k-x that means weather sealed lens is kinda irrelevant since the camera isn't sealed - so the sigma might be a more obvious choice specially if its cheaper
Yes but this won't apply when i get my K5
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Old Oct 2, 2010, 11:05 PM   #17
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Quote:
Originally Posted by guillermovilas View Post
Yes but this won't apply when i get my K5
Fair enough. I think the next question is... do you have the budget for the DA* 60-250? If so, there's your answer. If not, then you'll have to compromise some more, like it or not.

Here's another suggestion. It's only about as fast as the Pentax DA 55-300 and it's fairly heavy... but it offers 100mm more at the long end:

http://www.bhphotovideo.com/bnh/cont...G&A=details&Q=

And Sigma also makes a 70-200 f/2.8 lens

http://www.bhphotovideo.com/c/produc...2_8_II_EX.html

And teleconverters to match which means you'll still get autofocus:

http://www.bhphotovideo.com/c/produc...r_1_4x_EX.html

http://www.bhphotovideo.com/c/produc...EX_DG_APO.html

Last edited by Biro; Oct 2, 2010 at 11:15 PM.
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Old Oct 3, 2010, 2:30 AM   #18
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you might have a hard time finding the sig 100-300 they discontinue that lens.
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Old Oct 3, 2010, 3:29 AM   #19
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also sigma teleconverters dont work properly with pentax cameras for some reason so you'll be effectively manual focus if your using one
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Old Oct 4, 2010, 1:31 AM   #20
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Quote:
Originally Posted by John.Pattullo View Post
also sigma teleconverters dont work properly with pentax cameras for some reason so you'll be effectively manual focus if your using one
That might be another reason why to go for a pentax 60-250mm instead
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