Forgot Password
Pentax Camera Forums Home

Closed Thread
Show Printable Version Search this Thread
02-03-2010, 06:53 PM   #106
Veteran Member
SteveM's Avatar

Join Date: Jan 2009
Location: Vancouver Island, BC, Canada
Photos: Gallery
Posts: 3,295
QuoteOriginally posted by Blue Quote
The FA 31mm ltd, FA 43mm ltd, FA 77mm ltd, D FA 50mm and D FA 100mm (including WR) are currently in production and are full frame lenses. The FA 600mm f4 is special order and rumors are that they are going to cut production on it, but it is full frame as well.
I've wondered why their latest lens, the "D FA 100 WR", is a weather sealed full frame lens.....?? I suppose they could do the same with any (or many) of the other full frame lenses from the past.... "D FA 31 LTD WR"???

02-04-2010, 12:45 AM   #107
Senior Member

Join Date: Jan 2007
Location: Kansas City, MO
Posts: 174
QuoteOriginally posted by RobA_Oz Quote
It seems that the main advantage of increased size for sensors is reduced noise at higher ISO settings. The main disadvantage, apart from cost, seems to be the reduced depth of field that arises from the increased diameter of the image circle. Of course, that's also an advantage in those situations where discrimination is required, to isolate a subject from its background. Generally speaking, though, wider field of view shots, where large depth of field is almost always desirable, are probably advantaged by smaller sensors, and telephoto portraits are probably advantaged by larger ones.

It also seems from the little reading I've done on the subject, that a very high lens resolving power can be a problem for larger sensors than smaller ones with the same pixel count, so, when I hear people talk about full-frame sensors taking "better" pictures than smaller ones, I wonder what they're really talking about. Are they comparing like with like, or are they just impressed by the pixel count?
FF can go to a higher fstop to get the same DOF with the same diffraction effect as APS-C. Only time smaller format can win in wide DOF contest is at f22 or whatever the limit is for the lens. Smaller system cannot decrease DOF in the manner that FF offers on the other end because they run into a lens restraint road block. The question is, which end of the aperture scale do you like to hang out at?

At base iso a good quality APS-C will look similar to FF. But, sensor only has one real iso setting and this is the base iso. Each iso higher is made by amplification and the FF pulls ahead slightly at each higher iso and will have better DR. You need to decide what iso and DR you will need and if it is worth the additional investment. Nice to have choices.

Last edited by Photomy; 02-04-2010 at 01:12 AM.
Closed Thread

  • 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!
bodies, body, d700, drop, ff, k20d, line, pentax, pentax news, pentax rumors, price, sensor
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Photokina 2010 is history, and there was no FF announcement. What now? ilya80 General Talk 25 10-09-2010 08:34 AM
Photokina 2010 Various booths fs999 Video and Pentax HDSLRs 4 10-04-2010 12:44 AM
Pentax Booth @ Photokina 2010 fs999 Video and Pentax HDSLRs 7 10-02-2010 05:29 PM
PDN: Photokina 2010 Day 1: The Incredible Shrinking Pro Camera Market johnmflores Photographic Technique 13 09-23-2010 01:57 PM
Photokina 2010, Pentax and the full frame mystery falconeye Pentax News and Rumors 727 09-03-2010 11:11 AM

All times are GMT -7. The time now is 06:21 PM. | 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]