Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-05-2010, 10:39 AM   #1
Site Supporter




Join Date: Nov 2009
Location: SASKATCHEWAN
Posts: 7
Telecovertors

I have a 18mm-250mm Pentax and would like to know what tele would work on this lens.Did Pentax make one to work on this lens?

08-05-2010, 11:05 AM   #2
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,312
QuoteOriginally posted by in2toy Quote
I have a 18mm-250mm Pentax and would like to know what tele would work on this lens.Did Pentax make one to work on this lens?
while optically it may work, the 18-250 mm lens would not auto focus because the resulting Fstop wpi;d beslower than any known AF system can work with.
08-05-2010, 11:34 AM   #3
Pentaxian




Join Date: Feb 2009
Location: Alameda, CA
Posts: 3,194
This lens will autofocus with a 1.4X converter, albeit a bit slow and with some hunting, provided there is enough light and something contrasty to lock on.

But I wouldn't bother with a teleconverter. The lens, while quite good for its range and price, is only so-so IQ-wise at the long end. It suffers even more with a TC.
08-05-2010, 02:03 PM   #4
Loyal Site Supporter
imtheguy's Avatar

Join Date: Mar 2009
Location: Virginia Beach
Photos: Gallery | Albums
Posts: 2,950
Agree with all the above...and I have tried it. You will get a better pic by just cropping instead of using any TC on the 18-250mm.

08-05-2010, 02:11 PM   #5
Veteran Member
icywarm's Avatar

Join Date: Jan 2010
Location: Saskatchewan
Photos: Gallery | Albums
Posts: 1,276
Dido... plus it is very difficult to hold even with a mono pod at the 500mm range(thinking x2 which I tried with a x1.4, not together, but to try)
Reply

Bookmarks
  • 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, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -7. The time now is 12:28 AM. | See also: NikonForums.com, 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?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top