All Forum Comments
Comment by johnriley posted on New Monitors at 21/05/2010 - 15:10
Comment by johnriley posted on SDHC Cards Life Expectancy? at 20/05/2010 - 22:58
7 is fine so far, but we've only had it a few days.
Comment by johnriley posted on Rapid Obselescence at 20/05/2010 - 15:11
Comment by johnriley posted on Pentax K-X and continous shoot in sports mode... at 20/05/2010 - 15:06
Comment by johnriley posted on where the girls are at at 20/05/2010 - 14:18
Comment by johnriley posted on Is the latest kid on the block EVIL? at 20/05/2010 - 13:32
If you take a 28-80mm lens on a 35mm film SLR and put it on a DSLR then the small sensor means that the camera only sees the centre part of the image projected by the lens.
Therefore, you need a wider lens for the smaller digital format, to get the same effect. The equivalent would about 18-55mm.
So, to understand what a lens produces as an image (if you are more familiar with film) then you mutiply by 1.5, give or take this means an 18mm lens on a digital camera gives a similar effect to a (18x1.5) 27mm lens on film.
Look at it another way. A "standard lens" for 35mm film was 50mm. For the same standard view the focal length needed changes. So a Minox sub-miniature needs a 15mm standard lens, the Pentax 110 needs 24mm, the Hassleblad needs 80mm, and so on.
The only reason now for messing about with "35mm equivalent" figures is that with digital there are lots of different formats (sensor sizes) whereas with film there were a small number of clearly defined ones.
Comment by johnriley posted on landscape lens suggestions please at 20/05/2010 - 12:17
Point the camera at a blank wall or sky, out of focus is fine, and adjust the dioptre until the etched lines on the focusing screen are sharpest.
Many photographers try to set the eyepiece whilst looking at a subject, which causes the eye to compensate and leads to an incorrect setting.
Comment by johnriley posted on landscape lens suggestions please at 20/05/2010 - 11:45
Comment by johnriley posted on Weekly Comp #150 - Life In Motion at 20/05/2010 - 11:08
Vista is much more annoying than W7, constantly asking for confirmation and permission....
Comment by johnriley posted on Rapid Obselescence at 20/05/2010 - 08:51


We'll be ordering the second on tomorrow - I know when Sue sees this against her CRT there will be no contest!
Many thanks for all the advice, which proved to be spot on. Great forum this!