Fast film, light meters and artificial UV.

[duncan_trebilcock]

Hi everybody,

 

I will be using delta 3200 and perhaps some delta 400 at a wedding

reception this weekend, and have just dicovered that there will be

strong artificial uv lamps at the reception hall.

 

My concern is about the levels of UV. I know that glass filters a lot

of UV in itself, and I have UV filters on my lenses anyway, but I am

unsure what the consequences of this type of lighting may be on very

fast films.

 

Another concern is metering. I have a Weston Euromaster with

invercone, and a couple of FE's, which are all calibrated to

eachother. The FE's are going to see the amount of UV that gets

through the lense, and the weston is going to see what gets through

the invercone. I don't know which to trust, one, both or neither.

 

If you have any practical experience of this situation, I would be

very grateful for any feedback regarding how I factor this in, or for

that matter whether I ignore it.

 

Thankyou in advance for any responses,

 

Regards

D.T.

[lex_jenkins]

Where is this reception going to be held? An aquarium? Are they planning to hand out sunglasses to the guests?

[kelly_flanigan1]

What is a "strong artificial uv lamp" mean?<br><br>Do you mean disco/hippy blacklights; ?<BR><BR>Maybe high efficency arc vapor lamps like in a grocery store?<BR><BR>Maybe you can do a test shoot beforehand; and or add more info on the light type. <BR><BR>

[kelly_flanigan1]

duncan; can you add a link to the lamp model or type?

[duncan_trebilcock]

Thanks for responding.

 

The lighting equipment is the type you can rent for disco's etc where everyones teeth and white shirts glow eerily. It is being rented, so I don't know exactly what type of lamp it is, or it's output, but the verbal description I got suggested that it would assert it's presence..

 

Not much to go on I'm afraid, and perhaps this is a non issue, I just haven't come across this before.

 

Thanks

D.T.

[jurie]

Duncan,<br>

<p>One option might be to buy one of the blacklights that screws into a regular lamp socket from a local party-supply store or headshop (you know, the stores in the "hipper" parts of town that'll also gladly sell you a pipe or hookah for "tobaco"). Try a few test shots, see how they turn out, and return the thing (or keep it, they can be pretty fun. I broke mine a couple of months back and kinda miss it... If you're doing this in Edmonton, AB, Canada, I'd be happy to take it off your hands)

<br><br>

Jordan R. Urie

[joseph_wisniewski]

You need some heavy UV filters, like a UV-2, or better yet, a yellow or orange filter. Glass lenses cut off somewhere around 370nm, and with the heavy UV output from the BLB (blacklight-blue) fluorescents, you'll get UV contamination. This will not cause much problem for the delta, being a B&W film. But unless your lenses are very well compensated, the UV will be out of focus, and it will cause a resolution loss and an overall haze. Same filter, as a gel, over the Westin.

 

If you typically shoot B&W events through a lime green filter, I'd go that way, it will block the UV quite effectively.

 

Color films are more fun, they're UV sensitive in all layers, and the result from BLB bulbs is often magenta. ;)

[duncan_trebilcock]

Joseph et al,

 

Many thanks for responding

 

Reagrds

D.T.