Frequently asked questions
Using 35mm slides is a cheap way of projecting very high quality images to very large sizes. But the slides should be considered disposable and used on a night by night, project by project basis. When used continuously they will fade and if they will be used a lot, say for a week’s evening events, duplicate slides should always be ordered, swapping out when necessary.
By ordering or normal plastic mounted slides: Plastic mounted slides
This mount is made of thicker plastic and will not distort plus the metal mask will hold the film flatter and reduce the amount of rippling caused by long periods of projection.
Or use our glass mounted slides: Glass mounted slides
This mount is much more substantial and the glass prevents the film distorting, in our tests for up to 16 hours of projection.
You can also turn off the lamp when it is possible to do so, or minimise projection times.
Despite LEDs being a much cooler illumination than conventional bulbs, they do nonetheless heat up. The brighter the LEDs, the more heat produced. The VISIO projectors have passive cooling that draws heat away from the LED to improve longevity, but still get hot to the touch.
There is no cooling at all of the slide, so this will heat up. The slide mount used for the VISIO projector use inexpensive slide mounts for economy, and if allowed to heat up the thin plastic may distort and the film may ripple too.
Note that neither the slide mount nor the film will melt or catch fire, but there will be distortion under some circumstances, particularly if run continuously for three or four hours. When used outside on a winter’s night this all may not be a problem.
Yes, all photographic slides fade eventually. How quickly depends of how much ultra-violet light the light source emits, the quantity of light in the beam, the temperature of the slide.
The ‘VISIO’ slides are exactly the same photographic film as all of out other products. The beam of the VISIO projector is very intense, there is no forced cooling of the slide and the light source is actually an array of five LEDs which illuminate the slide in an uneven fashion.
Our tests show that when the projector is used continuously for a full battery charge-worth (about three to four hours) the projector will get very hot and by the end there will be some visible fading of the slide. Whether this matters or not depends very much on the projection scenario. The blacks will degrade and become less solid, but may not be noticeable when projected onto a building, for example.
That’s just a confusion over terminology – it is one and the same thing.
35mm slides refers to the photographic film format (the images are exposed on a roll of film that is 35mm wide, the actual visible area being 36mm x 24mm).
50mm (actually 50mm x 50mm) refers to the overall size of the mount that contains the photographic film. In the ‘old days’ we referred to “two by two” slides, meaning 2 inches x 2 inches (50xmm x 50mm).
50mm square slide mounts fit all slide projector magazines designed for the 35mm film format. There is however a complication over the thickness of the mount – our glass slides are 3mm thick and fit all Kodak Carousel slide projectors but may not fit other brands of projector. Our glassless slides are 2mm thick and will fit all slide magazine produced over the last fifty years.
Our Retro-View reels have images that are a very square-ish rectangle in landscape orientation. This can’t be varied, it is part and parcel of the venerable View-Master system.
Therefore, care should be taken when choosing your images. While it is possible to use other shaped images without cropping, they don’t look great as they don’t make best use of the very small image space.
If you can find your way around Photoshop then you are welcome to pre-prepare your own images (details on FAQs). Otherwise, we will, by default intelligently crop your images to fit the Retro-View format. You might find this template handy for image preparation: Retro-View template
Here below are some examples of what sort of images work and don’t work.
As the reel images are so small (about 11.5mm x 10mm) you can use images from pretty much any source, including your Facebook/Instagram/Flickr/Snapchat/iPhoto libraries. However, the larger and better quality your photos are, the better quality your reels will look when magnified in the viewer.
The images are landscape orientated square-ish rectangle. You should bear this in mind when selecting your images. While it is technically possible to use upright images or wide horizontal images on a reel they don’t look great, as they view much smaller.
If you are a whizz with Photoshop (or other image editing programs) you can supply your images to the correct dimensions of 1240px wide x 1125px high @ 300dpi. You might find this template handy for image preparation: Retro-View template
To get 3D images you need to use a 3D camera in order to capture the left eye/right eye views needed to create a 3D illusion. The Fujifilm “FinePix REAL 3D W3” camera works well Click for more info about FinePix 3D camera.
For the more adventurous there are a few other cameras out there such as the Panasonic Lumix DMC-3D1 or if you are technically up to it then it might be fun to find a Holga 3D film camera and scan the negatives. And there other alternatives such as using beam splitters in front of your standard digital camera or use the time honoured method of ‘shoot and slide’ where you take two separate exposures a few inches apart.
If you are a whizz with Photoshop then it is possible to create pseudo 3D effects by manipulating your images and there is also software out there that attempts to create 3D images from 2D (if you are prepared to take the time experimenting).
All of the above methods will require time and experimentation to get convincing results but by far the simplest method is use the FinePix REAL 3D W3 camera designed for the job.
If you supply 3D images (stereo pair) then yes they are. If you supply ordinary photos then it isn’t a problem, your reel will be 2D.
Reels have seven images. At first glance it may seem that our Retro-View (View-Master compatible) reels have many more than seven images but remember that the viewers are binocular and each eye requires its own image to create the 3D illusion. Hence the 14 image windows.
However, almost all of the reels we supply are created from 2D images, therefore the image is simply printed twice – one for the left eye, one for the right. No 3D illusion, but 2D images look fab anyway.
In fact View-Master reels have always had seven images, since the system was created in the 1930s. And people do ask, but it is impossible to have more than seven images on a reel. Seven images and only seven images – that’s the rule.
To use this lens calculator you need two measurements.
First measure the width of your screen (or other projection surface) in metres.
Then determine where your projector is to be positioned and measure the distance from the front of the lens to the screen, again in metres.
This calculation assumes you are using a 35mm slide in landscape orientation, and that the image fills the width of the slide.
Other Kodak lenses are:
85mm fixed focal length
93mm fixed focal length
100mm fixed focal length
150mm fixed focal length
180mm fixed focal length
There is a wide angle 36mm lens designed for short-throw back projection, but this requires projector adaption.
The 80 slide Kodak Carousel slide trays can take slides up to 3.2mm thick.
So this includes our plastic 2mm slide mounts and glass 3mm slide mounts, as well as other slide mounts such as old fashioned card mounts or ‘CS’ or ‘KLM’ thin plastic mounts.
However, the golden rule is not to mix slide mount types as the change in thickness will give focus shifts entailing either manually changing lens focus or autofocussing (if you have it). Either will be irritating to the audience and projectionist.
We recommend not using 140 slide magazines at all (if you can find them!), even if your projector can use them.
There are few 35mm slide projectors made these days. Those that are made use the straight magazine or the vertical rotary magazine (and most often they take both). However, there are hundreds of second-hand slide projectors out there that are perfectly serviceable.
The Kodak Carousel range of projectors were made for many years and were built for long term service in commercial environments. This makes them ideal for extended use, even today.
The Carousel slide projector was introduced in the early 1960’s and the slide tray design is the key – not only was the slide tray spill-proof and held 80 slides but it fed slides into the projector by gravity, a great aid to reliability.
In 1979 the splendid German-made Kodak Carousel S-AV range of projectors were introduced. Built like tanks, they were specifically designed for multiple projector slide shows. When linked to tape recorders and dissolve units a fully automated multiple image, multiple screen audio-visual experience became possible.
Extending the range came Ektagraphic and Ektalite models but our focus is on the Ektapro range that was introduced in 1992 and were made until 2004. The Ektapro’s had much better lamp technology, lamp heat management and computer controllability and a 10 million slide change lifetime.
Which projector to choose?
The S-AV and Ektapro ranges are both built like tanks and will give good service with little to go wrong. The models within each range all sport features ranging from basic to comprehensive, so check out what the projector is capable of before purchase. Lamp availability is fine still for both ranges.
However, our recommendation is to go for the Kodak Ektapro models 30**, 40**, 50**, 70**, 90**. The model numbers changed over time and features were updated but all except to 30** series have:
- Auto-lamp switch on bulb failure
- Extra bright lamp control
- Random access via infrared remote control
- Compatible with spiral and gear rack mount lenses
- System check and tray zeroing on switch on
- No slide – no light feature
- Economy lamp setting
- Lamp failure indicators
- Zero positioning indicator
- Mains voltage: 120, 220, 230, 240 V, Frequency 50/60 Hz
- Dual-plane pressure system slide gate
The 5000 and 9000 series have autofocus and built in timer (1 to 60 second slide changes) for self-running presentations.
So you are using a Kodak Carousel slide projector that has an interval timer. Great, this allows unattended uninterrupted slide shows.
.However, if you want your show to run without pauses after your last image then you must fill the magazine with slides. If you only use 60 slides, for example, most models of the Kodak projector will still cycle through the 20 unfilled slots. Luckily, most models of the Carousel projector know there isn’t a slide in the gate, so the capping shutter stays closed and the screen remains dark through the gap-cycling phase. Filling all the slots with slides can be achieved with duplicate slides, or you may be happy with a timed blackout between sequences.
OK, if you want an uninterrupted display that is no problem, just fill the magazine with 80 slides then? Actually, no. You will notice that ‘0’ on the magazine? The zero position indicates that the magazine can be lifted on and off the projector. But it is also a slide slot. If you use 80 slides there will be a black pause between the last slide (80) and the start of the show (1).
You actually need 81 slides to produce a continuous uninterrupted slide show. But wait, if you put a slide in that ‘0’ magazine slot it will drop straight out! The correct method is thus: with the magazine off the projector, drop the 81st slide into the projector’s slide gate. Remember, the slide needs to be the correct orientation, the same as you insert them in the magazine (right reading, upside down). Now fit the magazine in place. When the slides are running the 81st slide now occupies the ‘0’ slot.
Don’t forget, when you are done with the slide show and you remove the magazine, slide number 81 is still in the projector! Retrieve it by pressing and holding the slide advance button – the slide will pop up.
That will depend on what film we are recording to. Here are the values:
35mm slides and negatives: 4096 x 2732 pixels
6x7cm transparencies and negatives: 8192 x 6702 pixels
5″x4″ transparencies and negatives: 8192 x 6732 pixels
Retro-View reels: 1390 x 1260 pixels
Note that these are the actual values we record at and therefore optimal sharpness will be obtained – if your images exceed this that is fine. If they are less that these values then the further away from optimal, the less sharp the slide will be. Whether this matters depends on variables such at size of projected image, distance audience are from the screen, quality of projection lenses, amount of detail in the subject matter, and customer expectations.
We can produce slides from any image, no matter how small. But the higher resolution the original image, the sharper the slide will be.
Note that there is no point using Photoshop or similar programs to resize the files to make them ‘bigger’. It won’t improve quality – it is the original image quality that matters.
Absolutely not. Or more accurately, not necessarily.
300dpi is a convention for images destined to be press-printed onto paper, for optimum quality. However, 300dpi on its own is meaningless – you also need to define the final printed image size. So, the very same ‘high resolution’ 300dpi image printed at 5″x7″ magically becomes a low resolution image when printed at 20″x16″.
Our 35mm film recorders output at 4096 x 2732px. The image size is 36 x 24mm. So we output at 2890dpi (or more accurately, 2890ppi – ppi = pixels per inch). If we said images must be supplied at 2890ppi many customers would faint at the concept.
DPI is a relative value, pixels are an absolute value. So, for our purposes, ‘quality’ of image is defined by the number of pixels the image is made up from. This isn’t an alien concept – we all know that a high end digital camera that shoots 36mp (mega pixel or million pixels) images is ‘better’ than a snapshot camera that shoots 5mp.
As far as slide production goes forget dpi and ppi, it has no meaningful application. The more pixels, the sharper the slide.
And for those that fret about a dpi setting in Photoshop, you can either put any value in or none, it makes no difference (just make sure you have the resample box unchecked when changing ppi values, so that you don’t accidentally change absolute pixel values).
CMYK images are only suitable for images destined for printing purposes. Your PC, laptop, tablet and phone screens – and our film recorders and photographic film – all use RGB. RGB has the widest colour gamut (the range and depth of colours in the visible spectrum) and CMYK is very much the poor relation, and just a means to an end.
Only have CMYK images? That’s OK, they can be converted to RGB. But for optimum quality, wherever possible, always work in RGB and supply images in RGB.