Reflectors *the final cut*

[ELiTeHaYDeN]

Hi there, I have a perfectly spherical ditronic/fs(is that it?) reflector out of a ELMO overhead projector, now they put the bulb arc at roughly 2.5cm away from the reflector rim... but from all the searching I have done, im under the impression that the arc is ideally ment to be mounted basically dead on the rim, even a little bit recessed to get the arc right on the rim(centered) if you know what i mean.

So whats the real freakin deal?

[Dazzzla]

The second way is the correct way. The only reason that people say to put the ark at the rim of the reflector is because they are probably using a soup ladle, which is a half sphere. Most pro reflectors are less, more like quarter spheres.

DJ

[Rox]

i think your reflector is dichroic so dont worry about the heat.

the light is reflected but head (IR) goes throug it.

[18wheeler]

I agree with Dazzzla. the second way is right. It will avoid 'two light sources' as you realized.

don't use a soup ladle unless you cannot find a feal reflector.

[Rox]

what do you use to make a surface more reflective?

if i had a spherical surface, what could i do to make it like a mirror?

[ace3000_1]

Originally posted by Rox
what do you use to make a surface more reflective?

if i had a spherical surface, what could i do to make it like a mirror?

Polish, barniz metalico

Trev

[Rox]

interesting,


it affords heat? (afford??) como se dice mejor esto?

[ace3000_1]

it affords heat? (afford??) como se dice mejor esto?

Ya no problem just buff it up well

Trev

[ELiTeHaYDeN]

its a coated reflector, whats the best thing to clean it with? something non abrasive im guessing?

and is there an easy to determine the focal point?

[ace3000_1]

its a coated reflector, whats the best thing to clean it with? something non abrasive im guessing?

Dishwashing liquid and your finger, make sure you rinse it first though to get excess dust off before you go rubbing your finger in there or you will scratch it. Dry off with a soft cloth.

The easiest way to find the R1 focal is to set somthing in the middle of the sphere until its reflected the same size, in other words the object reflected you shouldnt see any bigger or smaller then the actual object.

Trev