[pure-silver] More; Re: OT: Brumberger MF Slide Projector
- From: Malcolm & Sylvia Brickwood <m_s.brickwood@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 19 Dec 2004 19:35:35 -0800
At last I had some time to take a peek at this lens again. I'm no
expert on this but I think Richard is probably right about it being a
triplet.
Thanka for tolerating this OT discussion.
Malcolm
On Nov 26, 2004, at 6:03 AM, Malcolm & Sylvia Brickwood wrote:
> Thanks Richard. Knowing that it's a low cost product is a great help
> and probably explains the performance because that's exactly how it is
> performing! I had no idea where it fitted in the quality spectrum. I'll
> check per your suggestion and report back.
>
> Thanks -
> Malcolm
>
>
> On Nov 25, 2004, at 9:52 PM, Richard Knoppow wrote:
>
>>
>> ----- Original Message -----
>> From: "Malcolm & Sylvia Brickwood"
>> <m_s.brickwood@xxxxxxxxxxx>
>> To: <pure-silver@xxxxxxxxxxxxx>
>> Sent: Thursday, November 25, 2004 8:24 PM
>> Subject: [pure-silver] OT: Brumberger MF Slide Projector
>>
>>
>>> We've recently been given a MF slide projector which is
>>> something
>>> always wanted but never justified. It's a Brumberger Model
>>> 1406 and is
>>> fitted with a Brumberger Anastigmat coated 5" f/3.5 lens.
>>> Somehow it
>>> does not look very sharp either in absolute terms or
>>> compared with our
>>> Leica Colorplan-P2 1.25/90 (on a Leica Pradovit P600 IR
>>> actually). The
>>> optics on the Brumberger MF projector are bit dusty but
>>> nothing
>>> serious.
>>>
>>> Does anyone know what performance should be expected from
>>> this lens?
>>>
>>> Thanks -
>>> Malcolm Brickwood
>>> Santa Clara, CA
>>>
>>
>> My memory is that Brumberger was a rather low cost
>> projector. I have no idea who actually made the lenses or
>> what type they are but the poor performance is probably
>> normal. Remember, you are comparing it to a very high
>> quality projector.
>> You may be able to discover the construction of the
>> lens by counting reflections. Even though the reflections
>> from single coated lenses are dimmer than those from
>> uncoated glass they are still pretty bright. If you see any
>> very dim reflections they are from a cemented interface. My
>> suspicion is that this is a triplet of some sort.
>>
>> ---
>> Richard Knoppow
>> Los Angeles, CA, USA
>> dickburk@xxxxxxxxxxxxx
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