Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-22-2008, 03:53 PM   #1
Junior Member




Join Date: Jan 2007
Location: Springfield, OR
Photos: Gallery
Posts: 29
Lens Repairs?

I have an SMC Pentax 100-300mm Zoom lens which is being used with my K100D. I wanted to know what other think about determining if the slight blur when at 300mm is due to a lens element being out of alignment, or what. What test can be performed to find out? In fact, what test can be performed for any lens for that matter?

Thanks to you Guru's of all things Pentax. I have had an ME Super for almost 35 years, and was thrilled to get the K100D but it sure is different!


Regards to all, Jim in Oregon

(200+ pix of the eclipse last night!)

02-22-2008, 05:35 PM   #2
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,984
Thread moved to the appropriate section.

Thanks!

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

02-22-2008, 05:39 PM   #3
Veteran Member
wlachan's Avatar

Join Date: Sep 2006
Location: Canada
Photos: Albums
Posts: 2,626
The Pentax 100-300 are known (2 versions at least) to be not very sharp toward the long end. I have never used this lens so have no idea how bad they are but should yours had misalignment, there is no way to recalibate even by Pentax. That's just how Pentax lenses are designed and made, unlike some other brands their lenses could be re-aligned through a few screws (like Tamron).
06-06-2008, 03:27 PM   #4
Junior Member




Join Date: Jan 2007
Location: Springfield, OR
Photos: Gallery
Posts: 29
Original Poster
And where might that be, Adam? I would like to read responses if I can find my messages.

06-06-2008, 03:34 PM   #5
Veteran Member
Tom M's Avatar

Join Date: Aug 2007
Location: Lincoln Park, NJ
Photos: Gallery
Posts: 782
QuoteOriginally posted by wlachan Quote
That's just how Pentax lenses are designed and made, unlike some other brands their lenses could be re-aligned through a few screws (like Tamron).
I wouldn't make such a blanket statement.
06-06-2008, 04:32 PM   #6
Veteran Member
clawhammer's Avatar

Join Date: Sep 2007
Location: Logan, Utah
Photos: Gallery
Posts: 975
If it's the power zoom version (FA 100-300 f/4.5-5.6), then it being soft at the end is just a fact of life with that lens. It's not a very good lens, and is 'soft as a pillow' at the long end.

Some of the best places for lens info/reviews are this site's lens review database, the K-mount Page, Stan's Pentax reviews (Pre-digital lenses only), and to a lesser extent photozone.de. If you look around those pages, you'll find the 100-300s aren't traditionally the best lenses, with the power-zoom version a particular stinker.

If you're looking for a better xx-300 lens, the newest sigma and Tamron 70-300's are good for their price (~150), and the new Pentax DA 55-300 is turning out to be a winner.
06-06-2008, 06:32 PM   #7
roy
Inactive Account
roy's Avatar

Join Date: Sep 2006
Location: D/FW area, Tx.
Photos: Gallery
Posts: 1,712
QuoteOriginally posted by jdarrough Quote
What test can be performed to find out? In fact, what test can be performed for any lens for that matter?
(200+ pix of the eclipse last night!)

put it on a tripod. most problems are not the lens or camera at 300mm but are user faults. use the 2 secound delay and a remote if you have one..
06-12-2008, 09:28 AM   #8
Junior Member




Join Date: Jan 2007
Location: Springfield, OR
Photos: Gallery
Posts: 29
Original Poster
I know about user error. Been taking photos for 40 years. I am using a tripod. I think it's the lens, as it is not the high end ones. My FA zoom is 35 - 85 and is much sharper. Thanks for your help!

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, k100d, lens, pentax, pentax lens, slr lens, test
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shipping in a Lens for Repairs? Hannican Pentax SLR Lens Discussion 5 09-14-2010 07:29 PM
Lens repairs PScott Troubleshooting and Beginner Help 1 11-26-2009 09:17 PM
What happens when a lens is sent to pentax USA for repairs pcarfan Pentax SLR Lens Discussion 5 08-19-2009 08:50 PM
Lens Repairs - Australia Arjay Bee Pentax SLR Lens Discussion 2 05-24-2009 11:45 PM
Repairs to M42 Super -Takumar 150/f1.4 lens lens Bellakelpie Pentax SLR Lens Discussion 14 12-07-2008 01:08 PM



All times are GMT -7. The time now is 12:25 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