Trickle Filters::
Remember that age-old piece of advice that says you cant have clear water old filter media in with the new ones, which in effect seeds the new filter
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I bought a load of filters today for a cracking price...... this guy wanted to sell his old nikon film camera with case etc..... and it had loads of extras..... so i got 15 filters of him for 1 pound each :mrgreen: ....... and there was some good ones in there too......
Anywho.... I came across one which only says "Hoya 52mm UV [0]"..... on the rim...... but looks infared to me..... then inside the box i found a hand written note saying 'Wratten N0 87 for B/W..... Rate at 25 ASA'
Recreational Vehicle water filter systems for RVs from Culligan and Ametek::
Recreational vehicle water filter systems for RVs from Culligan and Ametek. Just twist-off the old filter and twist-on the new filter without a mess.
http://www.waterfilters.net/Filters/RV/RV.htmHOME |
So this is indicating that it is indeed infared...... and i'v found a bit of info saying that the wratten number is to do with how much light gets through..... but my question is....
What does the rate at 25 ASA mean?....... and more importantly, i'v JUST ordered the Hoya R72 filter to do IR photography..... should i cancel my order?..... will this do the same job on my Nikon D50?...... i noticed that it said 'for black and white film'.... but not sure if it will still do the same thing, but maybe need a longer exposure?
Parkson Home >> News >> General News >> Convert old filters::
IS IT TIME TO REFURBISH YOUR BOTTOM FEED DYNASAND® FILTERS? Instead of refurbishing bottom feed DynaSand® Filters, convert them to top-feed.
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04a. Oring for each end of the old style straight oil filter (without ::
for each end of the old style straight oil filter (without built in rubber end tubes), req. bottom of the oil filter housing for an old one left behind
http://www.re-psycle.com/dlrindexsend_pg_catprod_levelcodeeq.+2___1970-75+Twins.htmHOME |
Any help would be appreciated :D
ah good stuff, thanks mark :thumbup:
This should help with the difference in filters: http://www.burren.cx/photo/ir_cameras.html
R72 passes 720nm and up. The Wratten 87 passes 800nm and up. The 87 is deeper into the IR, which might result in extraordinarily long exposure times, since the Nikon internal cutoff is something like 750nm max. The 87's curve does start just as the D70's curve ends, so you can at least get something. I don't know about the D50.
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Old filters?........>