Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
03-15-2008, 08:42 PM   #31
Veteran Member
Mechan1k's Avatar

Join Date: Jun 2007
Location: Sydney, Australia
Posts: 2,889
QuoteOriginally posted by aegisphan Quote
Usually I call it a macro slider. Here is an example of a double slider

Velbon Macro Slider

I use it mostly for 1:1, wide open shot of flower. At this magnification, the DOF is extremely thin, you use the slider for precise movement to get the specific part of the flower in focus. It's much more convenient than to move your whole camera+tripod setup back and forth. There are two type of sliders: a double slider (you can move in 4 directions) and a single slider (only back and forth). The double slider is more expensive.

I bought a double slider, but later converted it into a single slider to use as a paranomic head as well. So the left and right movement is not that important.
oooooh ... good to know it can be used as a pano head as well ... now I am very interested in this. A slider head makes things a hell of a lot easier when at 1:1 ... especially getting your focus point perfect.

03-16-2008, 01:52 PM   #32
Veteran Member
aegisphan's Avatar

Join Date: Nov 2007
Location: New Mexico
Posts: 815
Here is my series of coin shot: 2.4, 4, 5.6, and 8. The 1st shot has a little different focus point than the rest but it still shows the DOF at the magnification. I did these shots at an angle, but definitely not exact 45 degree.

03-16-2008, 04:24 PM   #33
Senior Member

Join Date: Dec 2007
Location: Boulder, CO
Posts: 114
Wow, the field of view isn't really that different either in this not so exact comparison... Very interesting...
03-16-2008, 05:43 PM   #34
Veteran Member
aegisphan's Avatar

Join Date: Nov 2007
Location: New Mexico
Posts: 815
Well that would make sense since we are doing it at 1:1, life size of the coin. Life size means the real size of coin compared to the sensor size. So the image of an object at 1:1 will be the same in the 35mm, 50mm or any focal length for that matter. The difference between focal length really boils down to their minimum magnification (that would govern the field of view) and the working distance to achieve that magnification. So even at 1:10, a 35mm and and 200mm will have the same FOV.


  • 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!
help, k-mount, lens, macro, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Nature Macro Flower selection Squier Post Your Photos! 6 10-26-2010 10:10 AM
Q on a 2x Converter selection. arbib Pentax SLR Lens Discussion 2 11-23-2009 01:31 AM
Help with lens selection splurf Troubleshooting and Beginner Help 3 11-20-2009 08:17 AM
Help with lens selection JamesD Pentax DSLR Discussion 39 10-30-2007 04:59 PM
Need lens selection help? DJR Pentax SLR Lens Discussion 4 09-18-2006 06:58 AM

All times are GMT -7. The time now is 04:43 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]