Slide projector - time of projection

[Pedro Pinto Basto]

Hello everyone,

I would like to buy a slide projector. I know that there are some slide projectors that you can regulate the time of projection of the slide. I looked everywhere, but I didn't find the maximum time you can project the film.
I mean between the time that the films are projected, how long can they be projected?

Thank you very much.

 

[Leigh B]

I would worry about heat damaging the slide.

Although good slide projectors have heat-absorbing glass, the slide still heats over time.

- Leigh

 

[Larry Cloetta]

Believe me, your family will appreciate it if you don't linger on slides long enough to heat them up.
If you do, they'll be tempted to heat you up enough to cause some damage.

 

[Arklatexian]

Believe me, your family will appreciate it if you don't linger on slides long enough to heat them up.
If you do, they'll be tempted to heat you up enough to cause some damage.

To keep the above from happening to you, try 3 to 4 seconds per slide, If that is not enough, your audience will let you know. I find for me that is about right and with my equipment I haven't destroyed a slide yet......Regards!

 

[AgX]

It very much depends on the projector. And here in Europe there were countless... and several incorporating a choice of projection times, even freely programmable.
The longest still projection time I found is 90sec. Fade-over times typically are 15sec.

Aside of that there where many automated accessory controls (for projectors that yielded the respective connector).

The easiest way though is to use ones plain finger...
Either on the projector itself or on a simple remote control.

 

[Agulliver]

The era of programmable slide projectors was the 80s, I believe...and only top models offered this.

I would say that different slides require different times. Some might be talking points, requiring a minute on the screen while others might be just a few seconds. I remember being advised by a teacher who shot a lot of slides that between three and twenty seconds was the usual time for projection.

 

[MattKing]

The era of programmable slide projectors was the 80s, I believe...and only top models offered this.

I would say that different slides require different times. Some might be talking points, requiring a minute on the screen while others might be just a few seconds. I remember being advised by a teacher who shot a lot of slides that between three and twenty seconds was the usual time for projection.

+1, although it is probably more correct to say that only the top models provided either a means to control them, or more commonly the connections to the equipment that actually did the controlling.
As an example: Dead Link Removed
That being said, many of the lower models of the Kodak Carousel line had 2 or 3 time settings on the back. If you engaged them, the slides would change automatically every 4 seconds (as an example).

 

[Pedro Pinto Basto]

It very much depends on the projector. And here in Europe there were countless... and several incorporating a choice of projection times, even freely programmable.
The longest still projection time I found is 90sec. Fade-over times typically are 15sec.

Aside of that there where many automated accessory controls (for projectors that yielded the respective connector).

The easiest way though is to use ones plain finger...
Either on the projector itself or on a simple remote control.

I'm really thankful for all your help.

Maybe I didn't explained right.
I'm looking for a slide projector that could project the slides automatically. If it is 90 sec, that's perfect. The problem is that I need that the slide change automatically for slide to slide.

Another question if I can mount the slides myself at home.

Thank you.

 

[miha]

The Pradovit P600 has buil-in timer for automatic slide change. It's steplessly variable from 3 to 40s.

 

[Leigh B]

A device called an intervalometer can be used to control any electrical device with a remote input.
These usually provide a contact closure at regular (adjustable) intervals.

You might need a custom interface between it and your slide projector.

I don't know what the equivalent name would be in Portuguese or other European language.

- Leigh

 

[AgX]

Pedro, a very versatile projector would be the Braun Paximat 925 Programm. A projector built to enable several programmable modes with straight and circular trays.

 

[Pedro Pinto Basto]

Pedro, a very versatile projector would be the Braun Paximat 925 Programm. A projector built to enable several programmable modes with straight and circular trays.

OK, thanks again.

So, do you know a slide projector that you can control directly the time? I mean, you can put 90 seconds between every slide?
I think that maybe is simple, if I just buy the slide projector that any other apparatus I had to join to the projector, but I'm really not sure.

 

[Pedro Pinto Basto]

Thanks guys!

Do you mount your slides at home? Is that safe?

 

[AgX]

there are basically these generations of projectors:

-) with a manual operated slider for two two slides

-) the same with a tray

-) automated transport of one slide

-) automated projection with fixed projection times

-) programmable times per slide

-) connection to outside steering (deicated unit or generic computer)


Projectors or so cheap nowadays, that it typically makes no sense to "upgrade" one with a DIY solution but to buy a model that best suits one demands.

 

[guangong]

if buying a slide projector I would suggest one that is operated manually rather than automatic. For the simple reason that when an automatic projector dies it is usually dead for keeps since parts are usually not available. A friend gave me a Prodovit when mine died but I have A Prada for 35mm as well as a Prado 500 and a Hasselblad manual projectors for 6x6 and 6x7 ( Hassy also made by Leitz). I also have the little Leitz projector intended for salesmen and scientific work...about as basic as you can get. Lent this one to a friend whose automatic projector broke and he found his slides looked stunning through the Leitz lens. Of course, if the automatic projector works and is free or cheap enough take it.

 

[guangong]

An afterthought. The gods of auto projectors normally kills them off in the middle of a show. A manually operated projector only crashes when the operator dies.

 

[1L6E6VHF]

Slide projectors with the timed automatic mode are almost as old as remote control projectors themselves. The Revere 808 (Not necessarily the first timed automatic projector) was introduced in the mid-1950s. Kodak's Cavalcade series would include the feature soon after.

The feature did not really meet its potential until the Kodak Carousel 550 hit the market in the early sixties. Automatic operating was of little benefit when all slide trays were straight, because an automated show would end when the last slide was shown. With the Carousel, the tray could continue the show indefinitely. The competing Sawyer's Rototray design followed suit.

These US Carousel models had timed automatic operation:
550 (the first Carousel), 570, 800, 800H, Custom 800H, 850, 850H, Custom 850H, 860, 860H, Custom 860H, 5400 and 5600, as did many Rototray models (I believe all Sawyer's 7xx models, the higher-end GAF-branded and Nikkormat-branded models).

Sorry I don't know which projectors in the European market have both timed operation and circular trays. The North American and European markets for slide projectors somehow became quite isolated from each other.

One caution about automated slide projection: projection of a slide does affect the dye image, and too much projection can cause fading, which may be color selective (changing the color balance of the slide). Counterintuitively, Kodachrome slides, with their legendary color permanence in dark storage, fade faster than E-6 slides in the projector gate, turning cyannish as the magenta dye is diminished.

 

[benjiboy]

Many years ago when I bought my first slide projector I thought my slides were sharp until I projected them on to a 50"X50" screen, and how disillusioned I felt.

 

[PittP]

Pedro, your question suggests that you look at fairly long and possibly repeated projections. To reduce wear and damage to slides, look for a projector with excellent heat filter and heat dissipation / cooling. These are normally the higher-end Kodak, Leitz/Zett, Braun, Rollei...
Avoid any projector with a direct current lamp, and even older Pradovits really fry the slides.
The Kodaks and Rolleis with a mirror in the path, and a fan for the slide itself, may be best option, and very cheap these days. For repeated projections consider circular trays.
Cheers, Pitt

 

[AgX]

Avoid any projector with a direct current lamp, and even older Pradovits really fry the slides.

I assume by direct curent you do not mean DC but instead mains AC.
(Off topic, but even a version of the simple Prado, with mains lamp has a ventilator and cooling air channel for the slide.)

The Kodaks and Rolleis with a mirror in the path, and a fan for the slide itself, may be best option, and very cheap these days.

.
Yes, likely a dichroic mirror/filter has better cut-off characteristics than a mineral heat filter.

 

[PittP]

AgX, thanks for putting it in right words.

 

[Pedro Pinto Basto]

Pedro, your question suggests that you look at fairly long and possibly repeated projections. To reduce wear and damage to slides, look for a projector with excellent heat filter and heat dissipation / cooling. These are normally the higher-end Kodak, Leitz/Zett, Braun, Rollei...
Avoid any projector with a direct current lamp, and even older Pradovits really fry the slides.
The Kodaks and Rolleis with a mirror in the path, and a fan for the slide itself, may be best option, and very cheap these days. For repeated projections consider circular trays.
Cheers, Pitt

Hi.
Thank you very much for the answer. I have been off this site so I didn't know so many people had help me with they answers

Do you know if there exist any of projectors have a time of projection of 60 seconds or more in every slide or in some of the slides (in the continuously mode of projection)?

 

[wiltw]

Do not forget that you are hurting the longevity of the dyes in the slides when you are projecting them, too!

 

[1kgcoffee]

There has to be high powered LEDs these days that generate a minimal amount of heat no?

 

[George Mann]

There has to be high powered LEDs these days that generate a minimal amount of heat no?

This type of modification shouldn't be to difficult.