Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-22-2012, 10:14 AM   #16
Pentaxian
v5planet's Avatar

Join Date: Jan 2010
Location: Seattle
Photos: Albums
Posts: 1,911
Original Poster
QuoteOriginally posted by vonBaloney Quote
What lenses are these? I don't think those UFOs should be there -- still looks like some kind of internal reflection...
They are all Limiteds.

QuoteOriginally posted by Ahab Quote
I love the 1st image with Saturn showing up quite well on the lower right side. My K5 has nowhere near that kind of resolution.

LOL. Well, I do love astronomy. Saturn was quite bright though, shining through the cloud cover.


OKAY-

I did some pretty monotonous and thorough testing this morning. Here is a giant grid showing the K-7 vs the K-5 for each of my four lenses, pointed at a bright light source. I shot wide open for each lens, and at f/8, with and without a UV filter (the same filter was used for all tests). Metering was different between the cameras, so I manually matched the exposure settings between the two.

(Excuse the mess, I just moved to a new apt).



I think it's pretty clear that my K-5 is showing much more flare than my K-7, even without filters in place. In all cases, the filters seem to make things worse, tightening the ghosts into brighter spots, but the K-7 is easily outclassing the K-5 on this front. Which it shouldn't be. I'm set to return this puppy for exchange unless anyone can convince me I'm crazy.

09-22-2012, 10:22 AM   #17
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,360
How are processing these? A the settings the same
09-22-2012, 10:25 AM   #18
Pentaxian
v5planet's Avatar

Join Date: Jan 2010
Location: Seattle
Photos: Albums
Posts: 1,911
Original Poster
QuoteOriginally posted by Lowell Goudge Quote
How are processing these? A the settings the same
These are all straight from camera, identical settings. Resampled to 450x300px and plopped into the grid. Ambient light (through closed blinds on north facing window on overcast day) shifted slightly while photographing the FA43 on the K-7. Otherwise things were as similar as they could be.
09-22-2012, 10:25 AM   #19
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,360
You know, on second thought, although not a modern lens by any means, I had a reflection like this with my Tamron 200-500/5.6 on my K5

See the photos in this post of the yellow warbler

https://www.pentaxforums.com/forums/lens-sample-photo-archive/164138-tamron-a...ml#post2087889

09-22-2012, 10:29 AM   #20
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,360
QuoteOriginally posted by v5planet Quote
These are all straight from camera, identical settings. Resampled to 450x300px and plopped into the grid. Ambient light (through closed blinds on north facing window on overcast day) shifted slightly while photographing the FA43 on the K-7. Otherwise things were as similar as they could be.
If anything I would say that the flare is sharper in the K5 but otherwise it is there on both
09-22-2012, 10:30 AM   #21
Pentaxian
v5planet's Avatar

Join Date: Jan 2010
Location: Seattle
Photos: Albums
Posts: 1,911
Original Poster
QuoteOriginally posted by Lowell Goudge Quote
You know, on second thought, although not a modern lens by any means, I had a reflection like this with my Tamron 200-500/5.6 on my K5

See the photos in this post of the yellow warbler

https://www.pentaxforums.com/forums/lens-sample-photo-archive/164138-tamron-a...ml#post2087889
Well, ghosting/flare happens with all lenses in the right conditions. The shots I posted are something of a torture test -- bright light source at close range in a dark room. You can see flare in all of the K-7 photos. What's striking to me is how much worse it is on my K-5... It was bad enough to notice easily on the live preview image during casual shooting in the field, using the same lenses on a subject I've shot half a dozen times under similar conditions without any notable issue.
09-22-2012, 10:49 AM   #22
Pentaxian




Join Date: Oct 2011
Location: Savannah, GA
Posts: 4,989
Try shooting a uniform subject (like a gray card), brightly lit, but without any of the lights pointing towards the camera like you've been doing -- just a well-illuminated subject that is even. Do you see an weirdness or hotspots -- they may be more likely when you stop down to f16 or so. Try setting the lens at infinity (even if subject is 2 feet away) and as close as it gets. I've got a few lenses with reflection problems and doing that I can usually generate hotspots (aperture shaped) on a even subject even without pointing a light source right into the lens. Of course those are definitely lens problems, and you seem to have a camera problem, but see if you can't create a more general problem rather than just direct flare.

If you can't figure it out, I'd take it back -- that's not right. But give it a good rocket blowing to make sure there isn't just a stray piece of glitter in there or something...
09-22-2012, 10:57 AM   #23
Pentaxian
v5planet's Avatar

Join Date: Jan 2010
Location: Seattle
Photos: Albums
Posts: 1,911
Original Poster
QuoteOriginally posted by vonBaloney Quote
Try shooting a uniform subject (like a gray card), brightly lit, but without any of the lights pointing towards the camera like you've been doing -- just a well-illuminated subject that is even. Do you see an weirdness or hotspots -- they may be more likely when you stop down to f16 or so. Try setting the lens at infinity (even if subject is 2 feet away) and as close as it gets. I've got a few lenses with reflection problems and doing that I can usually generate hotspots (aperture shaped) on a even subject even without pointing a light source right into the lens. Of course those are definitely lens problems, and you seem to have a camera problem, but see if you can't create a more general problem rather than just direct flare.

If you can't figure it out, I'd take it back -- that's not right. But give it a good rocket blowing to make sure there isn't just a stray piece of glitter in there or something...

I might try a few more things, but I'm getting close to the 200 shutter actuation limit on items returned to B&H. :-)

I'm convinced there's a problem, so it'll go back.

09-22-2012, 11:24 AM   #24
New Member




Join Date: May 2012
Posts: 1
It sucks to be you
09-22-2012, 11:27 AM   #25
Pentaxian
v5planet's Avatar

Join Date: Jan 2010
Location: Seattle
Photos: Albums
Posts: 1,911
Original Poster
QuoteOriginally posted by photodudeny1 Quote
It sucks to be you
I know, I know.
09-22-2012, 01:33 PM   #26
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,144
The K-5 and DA 15ltd seem to struggle with bright point sources that are not centered in the image. The rear element is "In your face" close to the sensor, wrecking havoc with reflections. These samples do not seem as extreme as yours.

edit: adding a crop of first image.

Last edited by Ex Finn.; 11-11-2014 at 05:47 PM.
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!
camera, da15, fa43, flare, ghosts, k-5, k-7, lens, light, pentax help, source
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax K7 LCD Screen flickers and ghosting redeleon Pentax DSLR Discussion 9 06-23-2012 04:17 PM
Ghosting/focus issue on reassembled vivitar 28-90 eabrust Troubleshooting and Beginner Help 6 03-05-2011 05:09 PM
dslr noob kx ghosting images (example shot) bob13bob Troubleshooting and Beginner Help 19 01-25-2011 01:18 AM
K-x: ghosting in image pentaxpup Pentax DSLR Discussion 10 12-14-2009 05:26 AM
The rest of the Ritz's are closing up unexpectedly K-9 General Talk 6 07-28-2009 02:57 PM



All times are GMT -7. The time now is 01:42 PM. | 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