Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-14-2011, 06:58 PM   #1
Junior Member




Join Date: Jan 2011
Posts: 25
where is the best way to put focus.

i like landscape shooting, but a freshman.
when l shot a landscape with wide lense,DA 12-24, I always put the focus in infinity, which is the best way or not?

04-14-2011, 07:38 PM   #2
Site Supporter
BigDave's Avatar

Join Date: Sep 2010
Location: Hudson Valley, NY
Photos: Gallery | Albums
Posts: 1,443
Soul:

With a lens like the 12-24, you have so much depth of field, you almost don't HAVE to focus!

But given the choice, it is best to focus on the part of the image that is closer to you and let the DoF carry to the horizon (infinity). If you leave it on infinity, you can risk loosing sharpness on the closer parts of the image.

Regards,
04-14-2011, 09:17 PM   #3
Site Supporter
SpecialK's Avatar

Join Date: Dec 2006
Location: So California
Photos: Gallery
Posts: 14,440
About 1/3 the way in. If you focus at infinity, you sort of "waste" some depth of focus on the far side of infinity, wherever that is :-)

Of course, that assumes you want as much in focus as possible at the given f-stop. If you want a tree in the foreground to pop, that's where you focus.
04-14-2011, 09:30 PM   #4
Junior Member




Join Date: Jan 2011
Posts: 25
Original Poster
QuoteOriginally posted by BigDave Quote
Soul:

With a lens like the 12-24, you have so much depth of field, you almost don't HAVE to focus!

But given the choice, it is best to focus on the part of the image that is closer to you and let the DoF carry to the horizon (infinity). If you leave it on infinity, you can risk loosing sharpness on the closer parts of the image.

Regards,
Thanx for your reply and pardon my English comprehension, I am puzzled that putting the focus on the hyperfocal position is the way guaranteeing all the things in this photo look clear, i remember the book said that.
another puzzle is about your first advice. what the distance of a focus you put can also guarantee the dof carried to horizon and the most sharpness?
in this picture i shot yesterday, i put the focus on the second tower ot this bridge, which i think it's enough to guarantee the sharpness. but which turns out not very sharp as i tought to be. Maybe, it is related to the weather condition, it was foggy yesterday. and I also think maybe there is another reason on focal issue.

04-14-2011, 10:06 PM   #5
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,984
This isn't a troubleshooting question. Moved.

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:

04-15-2011, 09:11 AM   #6
Site Supporter
BigDave's Avatar

Join Date: Sep 2010
Location: Hudson Valley, NY
Photos: Gallery | Albums
Posts: 1,443
QuoteOriginally posted by SoulAsylum Quote
in this picture i shot yesterday, i put the focus on the second tower ot this bridge, which i think it's enough to guarantee the sharpness. but which turns out not very sharp as i tought to be.
Soul:

the image is not posted (nor a link) so there is nothing to look at to see what the problem was.

And since you are aware of hyperfocal distance. generally, this is the way to go, just remember to pay attention to the f numbers when "guestimating" (guessing and estimating) the HFD. Not all lenses provide this information though, and the use of Depth of Field preview can be very useful, if your camera has this. As SpecialK stated, about a third of the way into the depth of the image is a good "rule of thumb" (general rule) to use when picking a point of focus. Generally speaking, the relationship is DoF extends one third in front of your point of focus and 2 thirds , or more, beyond. However the further you stop down, to the high f numbers, the more the depth of field extends beyond your point of focus toward or to infinity.

Regards,
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, landscape, pentax help, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ok, so how do I put this stuff together again? Skog Troubleshooting and Beginner Help 14 02-10-2011 05:17 AM
How to put K-X into a case? fekish Troubleshooting and Beginner Help 6 06-12-2010 08:38 AM
Landscape I have put the K-7 on ice... Duplo Post Your Photos! 6 01-20-2010 05:44 PM
What UV filter should i put on my DA* ? dreamnet Pentax SLR Lens Discussion 9 10-14-2009 03:42 AM
K-7 fps put to test. nulla Pentax DSLR Discussion 45 07-24-2009 03:47 PM



All times are GMT -7. The time now is 06:40 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