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?
So whats the real freakin deal?
Attachments
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
DJ
i think your reflector is dichroic so dont worry about the heat.
the light is reflected but head (IR) goes throug it.
the light is reflected but head (IR) goes throug it.
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.
don't use a soup ladle unless you cannot find a feal reflector.
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?
if i had a spherical surface, what could i do to make it like a mirror?
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?
and is there an easy to determine the focal point?
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🙂
making a mirror
Rox: if i had a spherical surface, what could i do to make it like a mirror?
If it is made from metal, then you can get it silver plated. The same places that plate silverware, teapots, etc. will plate almost any metal object for you. Tell them you want a bright mirror finish, so they don't make it a matte finish. This kind of silver plate can be 98% reflective. It just costs more than aluminum.
It may cost you more than just buying a glass reflector! Maybe ace has one for you?
Rox: if i had a spherical surface, what could i do to make it like a mirror?
If it is made from metal, then you can get it silver plated. The same places that plate silverware, teapots, etc. will plate almost any metal object for you. Tell them you want a bright mirror finish, so they don't make it a matte finish. This kind of silver plate can be 98% reflective. It just costs more than aluminum.
It may cost you more than just buying a glass reflector! Maybe ace has one for you?
silver plating
Creo que esta: "chapado de plata" en Espaniol.
Almost any large city has shops that do metal plating. The most common is chrome plating, for automobile restoration. If you can find a shop that does chrome plating, you can call them to ask if they also do silver. If not, then they can tell you where to go.
Fancy restaraunts and hotels that use silverware, get it replated when it starts to look worn. You could ask the manager of such a restaraunt where they get their silver replated. Or maybe just look in a local telephone directory.
Creo que esta: "chapado de plata" en Espaniol.
Almost any large city has shops that do metal plating. The most common is chrome plating, for automobile restoration. If you can find a shop that does chrome plating, you can call them to ask if they also do silver. If not, then they can tell you where to go.
Fancy restaraunts and hotels that use silverware, get it replated when it starts to look worn. You could ask the manager of such a restaraunt where they get their silver replated. Or maybe just look in a local telephone directory.
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