Re: [photo-3d] Ni-MH for Viewers

["opal" <tech@xxxxxxxxxxxxxxxxxxxx>]

Hello...
i have a red dot viewer that did work with electricity..... then
power unit smoked out...

I haven't used it since then because i've been
looking for a replacement power unit.....

do you guys know where i can get a replacement
smaller bulb to use the built in battery supply system.

or better yet a replacement electric illumination system

chris


----- Original Message -----
From: "Linda Nygren" <lnygren@xxxxxxx>
To: <photo-3d@xxxxxxxxxxxxxxx>
Sent: Wednesday, February 07, 2001 12:26 PM
Subject: Re: [photo-3d] Ni-MH for Viewers


> I have not tried these, but I would expect that NiMH batteries might
> have the same problem as NiCads of not maintaining a charge "on the
> shelf" (or more to the point, "in the viewer"). Perhaps someone that
> knows more about these batteries will know better about their general
> characteristics even if they have not specifically tried them in a
> viewer. I know that many people use NiCads in viewers, and the light
> weight is nice and I think others' exerience is that there is enough
> voltage for good bulb brightness. But they don't maintain a charge over
> time.
>
> Is it true that the main advantage of NiMH over NiCads is lack of
> "memory" that keeps the Nicads from recharging all the way up to full
> voltage if you don't let them run down completely before recharging? Or
> is it true that the alleged "memory" problem with NiCads is a myth, as I
> have also heard?
>
> My personal preference for battery operated viewers is rechargable
> *alkalines* from Rayovac. The chargers aren't all that expensive, and
> these batteries can be reused probably 50+ times and usually cost only
> about twice what regular alkalines cost. They maintain charge on the
> shelf or in the viewer (and indeed are ready to use right out of the
> package). They can be recharged at any point of the battery discharge
> cycle, so you don't have that dilemma of deciding when a battery is
> getting too low and needs to be thrown away as when using "regular"
> batteries. And no "memory" problem, so they don't need to be completely
> discharged before recharging. Being heavy like regular alkalines is the
> main disadvantage in my opinion. -Linda
>
> Paul Talbot wrote:
> >
> > I'm still getting caught up after being out of touch with
> > e-mail for a few days; it looks like no one replied to this
> > yet.
> >
> > Pixschack@xxxxxxx wrote:
> >
> > > Has anyone tried NI-MH D cells for viewers like the red button or
similar?
> > > Are they less bright than alkaline?  Do they last?
> >
> > I haven't tried the NiMh D cells yet, but I have tried the
> > AA cells in a fluorescent light attachment.  I had heard a
> > club member rave about how wonderful they are, but so far
> > my experience has been the opposite.  On all four of the
> > initial batteries the charger never turned off the charging
> > light.  The manufacturer replaced the charger and two of
> > the batteries, and I bought two more new ones.  Only one of
> > the charging lights in the new charger would turn off, for
> > just one of the four new batteries.  The manufacturer said
> > to take the batteries out after the recommended charging
> > time even if the lights were still on.  I tried that, but
> > I've gotten virtually no usability from any of the batteries
> > in either the fluorescent light fixture or in my electronic
> > flash.  So far for me these batteries have been a total
> > waste of money.  Presumably others must be having better
> > luck, but that's my experience so far.
> >
> > The NiMh batteries, I believe, are rated at a much lower
> > voltage than alkaline batteries.  Would that result in
> > reduced light output from halogen bulbs?
> >
> > Paul Talbot
>
>
>
>