All Forum Comments
Comment by johnriley posted on Pentax 55-300 or Tamron 70-300 advice on a k100Ds at 23/01/2009 - 10:18
Not a problem for 1970s film cameras, but maybe a problem dor modern DSLRs.
Comment by johnriley posted on My inherited Lenses - any experience with the K20d? at 23/01/2009 - 00:09
Comment by johnriley posted on Cash back on k20d... at 22/01/2009 - 09:28
Comment by johnriley posted on Why take a photogaph? at 21/01/2009 - 23:37
depth of focus
Depth of focus is the amount of leeway you have when manufacturing a camera - it relates to the placement of the CCD or film plane. Just like depth of field in the subject, at the fil plane there is a certain amount of depth of focus available. The degree of accuracy has to be higher the smaller the format.
This is quite interesting because smaller formats have more depth of field but much smaller depth of focus, so manufacturing standards have to be much higher. This is where the 110 film cartridge failed.
Comment by johnriley posted on Weekly Competition # 81 - Flower Power! at 21/01/2009 - 12:20
Thanks!
Comment by johnriley posted on How to Post Images at 21/01/2009 - 11:52
Comment by johnriley posted on Prices in photographic shops in Singapore at 21/01/2009 - 11:45
Unless you're looking for an A3 for professional use, Is there really any need for the expense of an A3 photo printer, as the outlay must be far more than getting shots blown up by a lab?
Doing the job yourself can give you superior results.
Comment by johnriley posted on Printing at home. at 21/01/2009 - 10:07
The question is: How can we persuade all future judges to be, to spend at least a few words on each entrie submitted to the competition.
Comment by johnriley posted on Weekly Competition # 80 - Nearness at 20/01/2009 - 23:20
Comment by johnriley posted on Can SRS Microsystems be trusted? at 20/01/2009 - 23:14


This assumes that the subject is stationary. For moving subjects a tripod with a ball and socket head can be used, leaving the head free to move. In this way you can pan with a subject but the camera is stabilised to quite a high degree.