Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
01-16-2014, 11:39 AM   #1
Junior Member

Join Date: Dec 2012
Posts: 40
Telephotos Questions

Got the short end covered up to 100mm for the most part, and a kit lens 50-200mm. Long end, I'm looking at the Pentax DA 300mm and the Sigma zooms - 150mm -500mm and especially the 120mm to 400mm. Surely there are others I'm missing. Not in a hurry... so taking my time. But I'm curious about a couple of things:

1) Prime vs Zoom at long end - Assume sharpness favors the Prime (duh), seems the variable distance to the subject - longer end for the most part, is going to favor zooms over primes in wildlife, birds, even some sports. Can't say 'cause I don't got the length! So that's a question... what do you or other photographers find more practical when you have to pick and pack your bag?

2) Sigma zooms get some comments: "Not good (sharp) on high pixel cameras like K-5's and later". Having a K-5... I'm wondering whether this was a lone comment or commonly accepted view? Some used Sigmas can be pretty attractive in price.

Any other input appreciated.


01-16-2014, 11:44 AM   #2
Loyal Site Supporter
blackcloudbrew's Avatar

Join Date: Mar 2009
Location: Cotati, California USA
Photos: Gallery | Albums
Posts: 3,816
I'd suggest that you rent a few of the long lenses and get some time with them. I rented the Sigma 150-500 in September and learned a lot about it. Costs a lot less than owning. YMMV
01-16-2014, 11:58 AM   #3
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,772
I think the Sigma zooms are quite good for the price, but not prime quality, which costs 3-4x more. Check out the 300mm plus thread for long lens info:

If money is no object then either the Pentax DA 560 or the Sigma 500 but those are big money. From what I have read from others the 50-500 is as good or better than the 150-500. I have the 50-500 and in good light I find it fine out to around 400 or a little further it does get softer after that but still acceptable if you have good technique.
01-16-2014, 01:19 PM   #4
Inactive Account

Join Date: Oct 2011
Posts: 147
What do you plan to shoot with your long lens?

Just a thought if you don't need poster-size blowups and AF:

Buy a new closeout Q complete with 5-15mm zoom for $189 at NewEgg. Add a Fotodiox M42 (V1 - no flange) adapter at $30.

Buy an SMC Takumar F1.4 50mm lens for maybe $70. Its an F1.4 280mm on the Q.

Buy an SMC Takumar F3.5 135mm for maybe another $50. Its an F3.5 750mm on the Q.

Or use whatever existing lenses you have with a K adapter instead.

You get 'long' lenses on the cheap, plus an extra camera

I did - lots of fun. Easy to tote. Couple shots below with 135mm hand-held. Full frame and cropped. Probably a lot sharper with a tripod.

Attached Images
View Picture EXIF
PENTAX Q10  Photo 
View Picture EXIF
PENTAX Q10  Photo 

  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
k-mount, pentax lens, prime vs., sigma, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Zooms and telephotos for sports alamo5000 Pentax SLR Lens Discussion 5 07-17-2012 08:17 PM
Inexpensive telephotos nick c Pentax SLR Lens Discussion 20 11-13-2009 07:49 PM
Two questions, one thread: Telephotos and focus screens, oh my! Dubious Drewski Pentax DSLR Discussion 6 09-10-2009 01:11 PM
Best long (affordable) telephotos? Finn Pentax SLR Lens Discussion 16 10-12-2007 01:44 PM
New DA* Telephotos kent vinyard Pentax News and Rumors 9 08-30-2007 01:48 AM

All times are GMT -7. The time now is 03:29 AM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]