Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-11-2013, 11:57 AM   #1
New Member
steve7cat's Avatar

Join Date: May 2012
Location: swindon uk
Photos: Albums
Posts: 23
camera focus and spectacles

I wear glasses, my optician tells me my short sight and long sight have degraded, but I do not wear them when using my camera. When I focus on something, using one of my manual lenses I rely on the focus icon and beep to tell me focus is achieved. To my eyes focus is at a different position to that the camera a KX decides it is.
how reliable is the camera at focusing? does anyone else notice this.
I have no idea how the camera works out the focus point, does it use the same system for the auto lenses and catch in focus?
Any help on this much appreciated.
Thank you Steve

02-11-2013, 12:19 PM   #2
Site Supporter




Join Date: Jan 2011
Location: Charleston, SC
Photos: Albums
Posts: 350
It's using the AF system so it is as accurate as AF. You need to adjust your diopter so that what you see is what you get.
02-11-2013, 12:19 PM   #3
Site Supporter
Bramela's Avatar

Join Date: Jan 2007
Location: Newcastle Australia
Photos: Gallery | Albums
Posts: 5,281
I have similar problems, however, I remove my spec's for camera use and have the diopter set to suit my eyes without specs. I find this works quite well, but I do rely still on camera focus beep a bit as well.
I find a little sharpening is always necessary in PP.

I am about to have cataract surgery (next week) so hopefully, photography wise, things will improve "out of sight"
02-11-2013, 12:20 PM   #4
Pentaxian
JinDesu's Avatar

Join Date: Jun 2011
Location: New York City
Photos: Gallery
Posts: 5,626
It uses the same system, but only the center point. The k-x isn't the best camera in achieving focus. It has taken me a year to get used to my k-x, but with fast lenses, it can be a little bit of a crapshoot sometimes. This is because the k-x has large focusing points, much older focusing technology and algorithsm, and a very tiny viewfinder.

Pay attention to the focus icon (green hexagon), not the beep. The beep is not meant to say you are in focus, but to say "I'm near focus". The green hexagon stays solid once the camera thinks it is in focus.

02-11-2013, 02:56 PM   #5
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
Is your diopter set correctly?
It's the slide on top of the viewfinder, you need to adjust till the information in the viewfinder is at his sharpest.
02-11-2013, 06:33 PM   #6
Pentaxian
zman's Avatar

Join Date: Sep 2009
Location: Western NY
Photos: Albums
Posts: 479
steve7cat,

As I have gotten older and my vision, even with glasses, has slightly degraded, I have wondered about the same thing you ask. I especially have difficulty using my longer MF lenses to focus and have started to depend on using the Catch-in-Focus feature. It seems to be more reliable than my eyes but is not 100% perfect all the time. I'm going to follow this thread with interest to see how others manage to overcome this limitation.
02-11-2013, 07:51 PM   #7
Pentaxian
mgvh's Avatar

Join Date: Sep 2010
Location: MD
Photos: Gallery | Albums
Posts: 855
Similar situation... I use catch-in-focus (CIF), but I've tested to see how it works for each lens. Some lens I get best results by going long and then coming back to focus. Some lens I start short and focus by going long.
02-11-2013, 08:14 PM   #8
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
I have worn glasses for distance from before I took up photography 30 years ago. At first I tried using diopter correction for my viewfinder and shooting without glasses, while I could focus easily, I had a hell of a time seeing what was going on I the outside world without my glasses. I soon decided to shoot with glasses because overall it was easier to not keep taking my glasses on and off.

One thing that is interesting from the OP is thenimpression that the focus is different with his glasses and the camera focus. This is unusual. Manual focusing is done by focusing the image sharp on the screen, an error in eyepiece diopter would not do this, the image would always be blurry, so there could be an issue that the focusing screen might need to be shimmed, or the camera needs to have the AF set up with adjustment for the lens in use

02-12-2013, 09:03 AM   #9
Site Supporter




Join Date: Jun 2011
Location: Texas
Photos: Gallery
Posts: 1,149
I've worn glasses full-time since 1960, and it would be a pain to remove them to use a camera. I choose cameras considering this as they differ in accommodating us 4-eyed shooters. I also use manual focus 99% of the time, as autofocus misses critical focus more than I do.
That's a reason I use Leica rangefinders for critical work, as I can focus them more accurately as my vision weakens. I seldom use an SLR with wider than 90mm, as an RF is more accurate below that (except for very close work).
02-13-2013, 12:41 PM   #10
New Member
steve7cat's Avatar

Join Date: May 2012
Location: swindon uk
Photos: Albums
Posts: 23
Original Poster
Thank you to everyone who replied I won't reply individually but try to answer all in one go
I have set my diopte all the way to one side, I think I would like it to go further than it can.to get the image perfectly clear.
I do not know why but I prefer the view finder I find it even harder to tell when focus is achieved using the screen .Although most of my pictures look to me like they are in focus on my computer monitor
I will trust the focus beep, and the catch in focus.
I have never tried contact lenses so I think a trip to the optician is a good idea, to see how they works out. Thank you again Steve
02-13-2013, 01:34 PM   #11
Site Supporter




Join Date: Jan 2011
Location: Charleston, SC
Photos: Albums
Posts: 350
Someone else will have to chime in, but I believe there is an optional eyepiece that changes the range of the standard diopter.
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, camera focus, focus, lenses, pentax help, photography, sight
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Consistent back focus with fast primes and low light? Is it me or the camera? zosxavius Pentax SLR Lens Discussion 10 12-03-2012 07:12 PM
How to Fix Front Focus and Back Focus Adam Pentax DSLR and Camera Articles 11 07-17-2012 10:01 AM
Focus & Recompose and Continuous Focus Question gut1kor Photographic Technique 4 05-09-2011 08:09 AM
spectacles and the viewfinder slr_neophyte Troubleshooting and Beginner Help 9 02-15-2011 01:56 AM
Please share your pre-focus technique and camera settings raider Photographic Technique 9 11-07-2007 11:44 PM



All times are GMT -7. The time now is 09:20 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