Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-07-2012, 08:30 PM   #16
Veteran Member




Join Date: Mar 2010
Location: NewYork
Posts: 899
QuoteOriginally posted by mtngal Quote
jezza - your pictures are awesome! I'm going to have to get out with my trusty K100 and filter some more.

ripit - Auto focus seemed to work pretty well through this filter (I used the kit lens mostly). It sometimes seemed a bit off, but it did better than I did with a manual focus lens and guessing the difference.

The composite picture was fun - I was using a tripod (a necessity with a non-modified camera) and so I took one picture in color then screwed on the filter and took another. When I got home I took both photos, put them both on different layers and then used a layer mask with a gradient to allow the lower layer to show through part of the picture, the gradient making a more gentle transition between the two pictures. The hardest part of that was making sure that I chose to do the transition where the clouds more or less matched.
I seem to recall that being one of the issues with the stronger b&w filter was no chance of auto focusing on a non modified camera. If memory serves, with my canon a70, the r72 could auto focus in very bright sunlight. I just checked the exif on some of my old photos and while a couple were 2 sec exposure, most were more, as much as 15 sec.

Out of curiosity, I tried indoor with the r72, my sony v1 and my ist-ds. Neither could auto focus (kind of surprising on the sony). The ist-ds was wanting a 16 second exposure at f2, where the sony v1 only wanted a 1 sec exposure in night mode I assume at f2.8 (shows how much difference that internal IR cut filter causes). The sony uses an auto focus assist laser array. The laser is not visible but can be seen through the viewfinder, so I'm guessing its IR. Maybe cutting out everything but IR masked the AF assist grid. It will be interesting how they do in daylight?

02-08-2012, 01:50 PM   #17
Loyal Site Supporter




Join Date: Dec 2006
Location: Frazier Park, CA
Photos: Gallery
Posts: 835
I never tried to focus indoors with the R72 filter, figured there wouldn't be enough reflected IR light to make things interesting. Outside was no problem with either the K7 or the K100 (so would be fine with the DS, don't think the K100's AF was any different). But then, I tried to use a bit smaller aperture to get the dof larger. Or else I was shooting to infinity.

One thing I found was that the filter helped the camera cut through a certain amount of haze, so things that would have been somewhat hazy since they were miles away, were much sharper. I just put the camera into manual focus and the lens at infinity, and got some nice results.
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, filter, hoya, hoya r72, pentax help, photography, r72
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Two Hoya R72 Infrared Filters - 52mm & 58mm (with 49-58mm step-up ring) (US/CA LowVoltage Sold Items 4 12-05-2010 06:05 PM
For Sale - Sold: Hoya 58mm Infrared Filter (R72) RawheaD Sold Items 0 09-23-2009 11:52 AM
For Sale - Sold: FS: Hoya R72 52mm infrared filter Ash Sold Items 4 02-13-2008 03:14 PM



All times are GMT -7. The time now is 01:20 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