Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-27-2012, 02:49 PM   #1
Senior Member
sbroadbentphoto's Avatar

Join Date: Aug 2010
Location: Sydney, NSW
Photos: Albums
Posts: 132
Sensor shift and size of focus points.

does anyone know if there is a correlation between the amount of distance the pentax sensor can shift and the large size of the focus points?
I wonder if the focus points have to be larger because it needs leeway for when the sensor moves to focus on the same point.

Maybe this is why canon and nikon have smaller focus point areas.

I don't know if anyone has asked this question before but it would be interesting to see if sony has the same problem.

10-27-2012, 03:20 PM   #2
HSV
Veteran Member




Join Date: Sep 2012
Location: Texas
Posts: 321
In Pentax DSLR, the AF sensor and image sensor are separate assemblies. The image sensor shift for SR, composition, and leveling adjustments only affect the image slightly in composition (meaning, up/down/left/right displacement). The AF system is related (so to speak, but not really) to the front/back orientation...and the image sensor cannot shift forwards and backwards.
10-27-2012, 04:52 PM   #3
Senior Member
sbroadbentphoto's Avatar

Join Date: Aug 2010
Location: Sydney, NSW
Photos: Albums
Posts: 132
Original Poster
i see it was kind of a silly question, i forgot to take into account that the sensor doesn't even see the scene until after focus when you are using a viewfinder, but the focusing section does
10-28-2012, 08:15 AM   #4
Veteran Member




Join Date: Sep 2007
Location: USA
Posts: 1,812
QuoteOriginally posted by sbroadbentphoto Quote
Maybe this is why canon and nikon have smaller focus point areas.
Be grateful if you can please provide comparative measurements, or references for this?

Thanks

10-29-2012, 04:07 PM   #5
Senior Member
sbroadbentphoto's Avatar

Join Date: Aug 2010
Location: Sydney, NSW
Photos: Albums
Posts: 132
Original Poster
QuoteOriginally posted by UnknownVT Quote
Be grateful if you can please provide comparative measurements, or references for this?

Thanks
I cannot provide any evidence, but have used a canon 60D and it seemed to follow subjects better with continuous AF (it was my only experience with it)
The Nikon D300s was an amazing camera to focus with. it just seemed so snappy, decisive and accurate.
10-29-2012, 06:43 PM   #6
Veteran Member




Join Date: Sep 2007
Location: USA
Posts: 1,812
QuoteOriginally posted by sbroadbentphoto Quote
I cannot provide any evidence, but have used a canon 60D and it seemed to follow subjects better with continuous AF (it was my only experience with it)
The Nikon D300s was an amazing camera to focus with. it just seemed so snappy, decisive and accurate.
Is that due to smaller point sensors
or just overall more sophisticated AF systems?
11-03-2012, 06:02 PM   #7
Senior Member
sbroadbentphoto's Avatar

Join Date: Aug 2010
Location: Sydney, NSW
Photos: Albums
Posts: 132
Original Poster
better AF system i guess
11-04-2012, 09:41 AM   #8
Veteran Member




Join Date: Sep 2007
Location: USA
Posts: 1,812
QuoteOriginally posted by sbroadbentphoto Quote
better AF system i guess
so... (not wishing to seem like "witch hunting", or "beating a dead horse")

why did your think this, please?
QuoteOriginally posted by sbroadbentphoto Quote
canon and nikon have smaller focus point areas.
Thanks

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, focus, photography, sensor, sensor shift, shift, size
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sensor Size and Pixel Size interested_observer Photographic Technique 5 02-04-2012 07:59 AM
Sensor shift. Usuqa Pentax K-5 30 01-16-2012 04:23 PM
Should I see focus points? New Englander Troubleshooting and Beginner Help 5 09-29-2011 07:16 AM
In MF, how much you need off-center focus points?? kales Pentax DSLR Discussion 8 11-02-2010 11:02 AM
Quick Question.. Please Help? K20D Focus Sensor size? designinme_1976 Pentax DSLR Discussion 2 10-02-2009 09:31 PM



All times are GMT -7. The time now is 07:16 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