Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-08-2011, 08:04 PM   #1
Pentaxian
Dr_who's Avatar

Join Date: Jun 2009
Location: Edmonton, Alberta, Canada
Photos: Gallery | Albums
Posts: 686
15mm vertical field of view?

If the angle of view is 86 degrees horizontally for the 15mm limited, what is the vertical field of view.

06-08-2011, 08:10 PM   #2
Site Supporter
SpecialK's Avatar

Join Date: Dec 2006
Location: So California
Photos: Gallery
Posts: 14,424
The lens database says 86 degrees diagonally, 77 degrees horizontally. I suppose a math major can tell us the formula to determine V.
06-08-2011, 08:22 PM   #3
Veteran Member
dgaies's Avatar

Join Date: Oct 2009
Location: Maryland / Washington DC
Posts: 3,917
Should be about 55 degrees vertically.

http://en.wikipedia.org/wiki/Angle_of_view
06-08-2011, 09:12 PM   #4
Senior Member




Join Date: Mar 2011
Posts: 140
A little over 38 degrees would have been my guess?

06-08-2011, 09:17 PM   #5
Loyal Site Supporter




Join Date: Jun 2009
Location: Tumbleweed, Arizona
Photos: Gallery | Albums
Posts: 4,998
A good resource is a Photographic CalculatorUsing 15mm with a 1.5 crop factor

FOV (horizontal) (degrees): 77.3
FOV (vertical) (degrees): 56.1
FOV (diagonal) (degrees): 87.7
06-09-2011, 12:45 AM   #6
wjt
Veteran Member




Join Date: Dec 2009
Location: Perth
Photos: Albums
Posts: 371
Ahh the elusive DA15, one day pentax will make them again.
06-09-2011, 01:13 AM   #7
Site Supporter
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,508
QuoteOriginally posted by SpecialK Quote
The lens database says 86 degrees diagonally, 77 degrees horizontally. I suppose a math major can tell us the formula to determine V.
I am NOT a math major, but if you have a calculator with triginometric functions, doing the math is straightforward:

tangens(half angle of view) = (half sensor dimension) / focal lenght; i.e.:

The vertical field of view ("v") with a Pentax APS-C sensor (23.5 X 15.7 mm) and 15 mm focal length lens is:

tan(v/2) = (15.7/2)/15 = 0.523 and thus

v = 2 * arctan(0.523) = 55 degrees

(Arctan is the "inverse tangens" - a function that you will have available on all scientific pocket calculators).
06-09-2011, 11:21 AM   #8
Pentaxian
Dr_who's Avatar

Join Date: Jun 2009
Location: Edmonton, Alberta, Canada
Photos: Gallery | Albums
Posts: 686
Original Poster
QuoteOriginally posted by wjt Quote
Ahh the elusive DA15, one day pentax will make them again.
Has the 15mm been discontinued?





Thanks to everyone who responded. I was mainly curious if I decided to use a 15mm in portrait mode how many pictures I would have to take for a panoramic I want to do.

06-09-2011, 02:35 PM   #9
Site Supporter
SpecialK's Avatar

Join Date: Dec 2006
Location: So California
Photos: Gallery
Posts: 14,424
QuoteQuote:
I am NOT a math major, but if you have a calculator with triginometric functions, doing the math is straightforward:
Ah, but only if you remember which buttons to push from 30 years ago :-)
06-09-2011, 05:17 PM   #10
Site Supporter




Join Date: Mar 2011
Location: Alexandria, VA
Photos: Gallery | Albums
Posts: 149
QuoteOriginally posted by Dr_who Quote
Has the 15mm been discontinued?
I bought one last week from B&H. But it had been out of stock for the last few months, and they only got 5 in this batch. I just checked their site, and they are already out of stock again (also out of stock at Adorama). Amazon seems to have a few, but at $60.00 more.
06-10-2011, 01:23 PM   #11
Pentaxian
Dr_who's Avatar

Join Date: Jun 2009
Location: Edmonton, Alberta, Canada
Photos: Gallery | Albums
Posts: 686
Original Poster
QuoteOriginally posted by bjdavey Quote
I bought one last week from B&H. But it had been out of stock for the last few months, and they only got 5 in this batch. I just checked their site, and they are already out of stock again (also out of stock at Adorama). Amazon seems to have a few, but at $60.00 more.
compared to stores in Canada, Amazon and Adorama are $200 cheaper. So I'd be willing to take teh $60 hit lol
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, dslr, field, k-5, k-5 ii, k-5 iis, k5, pentax k-5, view
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lens' field/angle of view MK-x Troubleshooting and Beginner Help 11 06-06-2011 10:24 PM
Field of view with small sensors Spring Creek Troubleshooting and Beginner Help 7 07-24-2010 06:48 AM
Okay Guys, Confusing Field of View joodiespost Troubleshooting and Beginner Help 9 01-11-2010 07:57 PM
Field of view Opahujo Pentax SLR Lens Discussion 9 12-04-2009 09:50 AM
standard view of field? gokenin Pentax Film SLR Discussion 11 09-28-2009 07:45 PM



All times are GMT -7. The time now is 09:41 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