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81A

Discussion

3 replies
Posted by chris hajee on November 6, 2006 at 9:43 AM
I,m looking for a 81A warming filter for my 500mm (canon) it has a drop-in filterholder and I have no idea what to buy?
Posted by Guy Tal on November 6, 2006 at 9:53 AM
If you're using a digital SLR you really don't need one. The same effect can be achieved using White Balance.
If using film, you need the Canon drop-in filter holder which takes any 52mm screw-in filter. B+W and Hoya make excellent ones.

Guy
Posted by Cliff Beittel on November 6, 2006 at 10:52 AM
". . . you need the Canon drop-in filter holder which takes any 52mm screw-in filter . . . "

To elaborate, Canon's big telephotos are shipped with a drop-in gel filter holder. Guy is right that it's much easier to buy the drop-in screw filter holder than to mess with gel filters. But the drop-in 52mm screw filter holder won't take every 52mm filter. The 52mm "Protect" filter that comes with the holder has a rim that's only about 4.5mm thick, and anything much thicker than that may not fit in the drop-in slot of the lens. Some filters have rims 5.5mm or more thick. One filter that I know works is the B+W MRC F-Pro, which is not only a great filter, but is only 4mm deep. The F-Pro filters are thinner than B+W's older filters (possibly discontinued, but perhaps still in inventory).
Posted by Ed Dubois on November 6, 2006 at 2:45 PM
Hi Chris

The cheapest option (other than doing a colour correction in PS or setting your camera's WB colour temperature) is to buy an 81A gel, cut it too size and put it in the filter holder that came with your lens.

Personally I wouldn't bother and would do the correction in PS when processing the final image. When I'm shooting kiteboarding and windsurfing in the summer I tend to set my camera at about 5800K as this shooting is nearly always done under blue skies. :smile: