So finished this rivited together one - bad “improvement” done in the 60's or early 70's by way of stripping out all holes and losing almost all fasteners. First of three I have worked on with those problems, amongst lack of step lens and also this one has a P-28s lamp socket installed in it instead of a G-22 socket.
(Other two fixtures I have not bench focused but might now be doing in comparison at some point. Bench focus for me is normally an end user or something for one of my guys to do given I already did the bulk of the work.)
Can’t be sold off as an antique so I added a 6x12 set of lenses to it for use as an upgrade to 360 radial like light - about the same size as a 6x12 in overall snout length. Works fine in a hard edge and while not totally flat field - somewhat normal given that big gaping oval hole in the reflector, but I have seen very flat fields on radial Leko’s before. Done them myself.
Normally with the single reversed 6x9 PC lens or step lens on a old school Leko, it should be like a 6x16 I’m told by the now passed original owner of the gear.
Now at 6x12, they are mostly similar in bench focus to a normal radial Leko - four screws to adjust instead of three, but otherwise balanced stool on a center screw pivot point. In this case a socket head set screw thus another tool to carry up to the grid with you, but for the most part the same concept.
I see a fairly good hard edge but not as good field (didn't play a lot with it) - sort of spotty field that’s somewhat even that’s possible for a larger opening in the reflector on the older Leko or way off in bench focus. More important and in something I have never seen before, it has a linear hot spot down the longitude with the lamp center. Not an off center hot spot - a long linear hot spot that for the most part split the beam.
Lack of slot in upper body - instead a hole in it for the center splitting apart of the fixture is perhaps an upgrade I might just do as stupid to have to remove the thumb screw in order to split the fixture in seeing where the lamp is.
None the less, in looking at where the lamp is inside the reflector, it’s in a good place - could come forward some or back a bit but overall the filament seemed centered.
What’s with the large linear hot spot in the beam? Any ideas?
Could send the lamp out further into the fixture some and re-center in getting filament further away from the reflector. That perhaps the cause? Anyone seen this before?
(Other two fixtures I have not bench focused but might now be doing in comparison at some point. Bench focus for me is normally an end user or something for one of my guys to do given I already did the bulk of the work.)
Can’t be sold off as an antique so I added a 6x12 set of lenses to it for use as an upgrade to 360 radial like light - about the same size as a 6x12 in overall snout length. Works fine in a hard edge and while not totally flat field - somewhat normal given that big gaping oval hole in the reflector, but I have seen very flat fields on radial Leko’s before. Done them myself.
Normally with the single reversed 6x9 PC lens or step lens on a old school Leko, it should be like a 6x16 I’m told by the now passed original owner of the gear.
Now at 6x12, they are mostly similar in bench focus to a normal radial Leko - four screws to adjust instead of three, but otherwise balanced stool on a center screw pivot point. In this case a socket head set screw thus another tool to carry up to the grid with you, but for the most part the same concept.
I see a fairly good hard edge but not as good field (didn't play a lot with it) - sort of spotty field that’s somewhat even that’s possible for a larger opening in the reflector on the older Leko or way off in bench focus. More important and in something I have never seen before, it has a linear hot spot down the longitude with the lamp center. Not an off center hot spot - a long linear hot spot that for the most part split the beam.
Lack of slot in upper body - instead a hole in it for the center splitting apart of the fixture is perhaps an upgrade I might just do as stupid to have to remove the thumb screw in order to split the fixture in seeing where the lamp is.
None the less, in looking at where the lamp is inside the reflector, it’s in a good place - could come forward some or back a bit but overall the filament seemed centered.
What’s with the large linear hot spot in the beam? Any ideas?
Could send the lamp out further into the fixture some and re-center in getting filament further away from the reflector. That perhaps the cause? Anyone seen this before?
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