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DEPSSI stands for DEPth of field and Sunrise Sunset Indicator and it does just what it says on the card. On one side of the card is a red, North/South line which, when lined up with true north, indicate via series of lines pointing out from the centre of the card, the direction that the sun will rise and set for each month of the year. The card is only of any use in the UK, that is, until you turn it over where you will find the depth-of-field guide.
With modern lenses often lacking any form of guide, this area of the card can prove invaluable.
There are two different versions of the card, green for 35mm and full frame sensors and blue for APS-C cropped sensors (1.5x and 1.6x crop factors) with a table and a short explanation of its use. By focussing on the Hyperfocal distance for any given combination of f-stop and focal length, you can maximise the depth-of-field achieved and this little card has a table of those distances to save any complicated mathematics. You just look up the focal length along the top of the table and the f-stop down the side and the distance given where the column and row intersect is the hyperfocal distance that you need to set the lens to. This will keep everything from half that distance to infinity in focus.
With these cards being no more than credit card size and laminated against the ingress of moisture, they take up no room at all in the camera bag and will prove invaluable to the landscape photographers among you. And at a price that makes a worthwhile investment for even the casual outdoor photographer, you can’t really go wrong
In summary, the positive points of the DEPSSI card are:
A handy item for the camera bag
Laminated, so should last
If it saves one trip back to a location it has paid for itself
The negative points are:
Compass still needed to find north
Type a little small for some
Size means only an indicator for sunrise/sunset
Check the latest price for the DEPSSI card here
Test by Ian Andrews www.wildaboutkent.com