Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-12-2011, 01:10 PM   #1
New Member




Join Date: Jul 2011
Posts: 5
black gradient on bottom of all photos shot with k10d

i am getting a black gradient on the bottom of all my photos when shooting with the k10d and the pentax 18-55 DAL lens, but when i put the 18-55 DA lens on it seems to work fine. clearly there is something wrong with the lens, but is there anything that can be done to fix it? i get the same gradient when shooting with the same lens with the Kx body.



07-12-2011, 01:45 PM   #2
Veteran Member




Join Date: Apr 2009
Location: New York
Posts: 328
Are you using a flash unit on your camera? It looks like when it goes past the sync speed and a part of the picture doesn't get lit. It happens sometimes when the flash isn't properly fixed on top of the camera so the timing's off by a hair.

Even though Pentax cams are designed to not pop a flash past 1/180 sec and avoid things like that you can still get it when the flash/cam doesn't communicate fully or the flash just messes up sync. My Sigma 530 Super does the same exact thing with shots over 1/125 even though it SHOULD go to 1/180
07-12-2011, 02:27 PM   #3
New Member




Join Date: Jul 2011
Posts: 5
Original Poster
no, i'm not using a flash. both the k10d and the kx have the same flaw in all photos when using this particular lens.
07-12-2011, 04:54 PM   #4
Inactive Account




Join Date: Dec 2008
Location: Ames, Iowa, USA
Photos: Albums
Posts: 2,965
Wow!

Something blocking light in the lens or the optics mounted crooked maybe? -Send it back.

07-12-2011, 08:59 PM   #5
Forum Member
MalcS's Avatar

Join Date: Jun 2011
Location: Virginia
Photos: Albums
Posts: 51
Could it have anything to do with a lens hood?

Wrong one for the lens, or not on right, or needs rotating or ???
07-12-2011, 10:16 PM   #6
Pentaxian
builttospill's Avatar

Join Date: Jun 2009
Location: Utah, Idaho
Photos: Gallery
Posts: 2,396
Hmmm, I just ran a roll of film through my LX and a never-used-before M 50/1.7 was attached for 3 of the pictures which produced a black gradient on the right side just like yours.
My other M 50/1.7 works great but I thought I'd try this one out. Do you have a filter on your DAL? Come to think of it I had a HOYA Pro filter on the lens, maybe I'll have to try it without the filter?

I'd like to know if it can be repaired too.

Last edited by builttospill; 07-13-2011 at 07:41 AM.
07-12-2011, 11:23 PM   #7
New Member




Join Date: Jul 2011
Posts: 5
Original Poster
there is no lens hood... there is a filter on it however. i will have to remove it and see if there is any difference.

as far as something blocking light, i cannot see any obstructions but i suppose it couldn't hurt to clean it.

07-13-2011, 03:05 AM   #8
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 51,584
The image you posted looks quite distorted, so I almost want to say that there's something wrong with the lens. Do try without the filter, though- it's worth eliminating as a cause.

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



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:
07-13-2011, 06:56 AM   #9
Inactive Account




Join Date: Aug 2008
Location: Michigan, USA
Photos: Gallery | Albums
Posts: 7,484
This doesn't look like a filter shadow. I'm betting more there is something going on with the rear of the lens that is blocking the light. Check and see if the black guard that is inside the lens mount has come loose or is misaligned somehow. Make sure there isn't something sticking out of the lens preventing the mirror from flipping all the way up. You say this happens with 2 different cameras and I assume doesn't happen with Other lenses.

A filter shadow would likely have an opposite shadow like on the top of the photo or all 4 corners or 2 of them. A Hood misalignment, same thing. A flash shadow would probably be semicircular unless you're using a square hood..

07-13-2011, 07:41 AM   #10
Pentaxian
builttospill's Avatar

Join Date: Jun 2009
Location: Utah, Idaho
Photos: Gallery
Posts: 2,396
Here's what mine turned out to look like:

07-13-2011, 10:17 AM   #11
New Member




Join Date: Jul 2011
Posts: 5
Original Poster
i think i figured out the problem for this specific lens. if you look at the following image the lens is not centered... looks like it might have somehow been taken out of alignment during transport or something. what do you guys think?

07-13-2011, 10:38 AM   #12
Inactive Account




Join Date: Dec 2008
Location: Ames, Iowa, USA
Photos: Albums
Posts: 2,965
QuoteOriginally posted by controlapparatus Quote
i think i figured out the problem for this specific lens. if you look at the following image the lens is not centered... looks like it might have somehow been taken out of alignment during transport or something. what do you guys think?
Yes. As I said earlier the optics are crooked. Either knocked out of alignment by being dropped or by being installed incorrectly. I'd send it back.
07-13-2011, 10:50 AM   #13
New Member




Join Date: Jul 2011
Posts: 5
Original Poster
ok, thank you all for your help. greatly appreciated.
07-21-2011, 11:01 PM   #14
Site Supporter
Site Supporter




Join Date: Jun 2010
Location: Central Coast, CA
Posts: 1,312
LX edge darkness

builttospill's LX camera most likely needs curtain travel time adjustments. You don't always see the problem because the severity is different at different shutter speeds. Something that looks fine at 1/250 can look ugly at 1/1000. Since you are in UT I would recommend Kew's camera service in Provo. It is a problem that can happen with any horizontal travel focal plane shutter.
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!
bottom, gradient, k10d, lens, pentax help, photos
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Misc Gradient OrenMc Photo Critique 5 12-15-2009 12:22 PM
Looking for ND and gray gradient filters ntx Pentax Camera and Field Accessories 9 08-18-2009 06:15 PM
From-Green-to-Purple gradient on K10D kulmann Pentax DSLR Discussion 23 05-23-2008 06:38 AM



All times are GMT -7. The time now is 06:08 AM. | See also: NikonForums.com, CanonForums.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