Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-18-2012, 10:37 AM   #16
Pentaxian




Join Date: Nov 2011
Photos: Gallery | Albums
Posts: 3,735
QuoteOriginally posted by azerak Quote
Here is a sample that I took using the same lens
That's some red eye!

12-18-2012, 12:25 PM - 1 Like   #17
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,695
Indeed, great shot. The apertures that should be used for your purposes follow the usual optical laws of photography in terms of subject-to-camera and depth of field (DoF). The closer the subject is to the camera, the less the depth of field. With a macro lens, this is even more prominent due to how close the focus can get with the lens (in the order of 31cm on the FA 100/2.8 macro). This close focusing makes what you'd expect to be a good aperture (like f/8) unusable due to the paper thin DoF. Diffraction is an issue for most lenses above f/11, but this lens shines at least to f/22, and I have barely seen any degradation in image quality even at f/32.

An example of how thin the DoF can get at close focus:

This image was taken at 35cm or so at f/32 - note how thin the DoF is in this image.

The trick is to have as much of your subject as possible to be on a perpendicular plane across the photographic field, to ensure DoF is sufficient at these critical focusing distances to capture all of your intended subject in focus.

Other examples of what this lens can do:




01-02-2013, 06:28 PM   #18
Forum Member




Join Date: Dec 2010
Location: Croydon
Posts: 58
Original Poster
@Ash, It's very clear now. Thanks for your time to explain this.
01-07-2013, 03:16 PM   #19
Forum Member




Join Date: Dec 2010
Location: Croydon
Posts: 58
Original Poster
In this case, particularly macro lens any effect with 'Hyper focal distance' concept? Can anybody explain how to use the distance scale on these lenses in terms of HFD?
Thanks in advance

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!
controls, f2.8, fa100mm, fa100mm f2.8 macro, k-mount, lens, macro, pentax, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
SMC Pentax-D FA 50mm F2.8--VS.--Sigma 70mm F2.8 EX DG, on Macro and Portrait ndhonghai Pentax K-5 6 10-02-2012 01:12 AM
Pentax 60mm f2.8 FF(35mm) + 90mm f2.8 (645) Macro lens patents Steelski Pentax News and Rumors 43 03-15-2012 08:16 AM
FA100mm f2.8 Macro Aperture Issue? kiwi_jono Troubleshooting and Beginner Help 12 06-01-2011 11:01 PM
Which macro Pentax DA 35 f2.8 or the Sigma ex 70 f2.8 myeates Pentax SLR Lens Discussion 5 02-10-2011 06:33 PM
For Sale - Sold: Pentax FA50mm/2.8 and FA100mm/2.8 macro lenses (Worldwide) dgaies Sold Items 13 12-31-2010 08:24 AM



All times are GMT -7. The time now is 12:02 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