What Is Slide Film: An Introduction To Color Reversal & E-6

So what is slide film? That leads to a whole conversation about slide film being known as E-6 and color reversal film. But there’s a lot more to slide film than just that fancy name. What’s more, there is a range of different types of color reversal film available, and some are as rare as gold.

Slide or color reversal film is a positive film. Instead of creating a negative to then print as a positive, slide film is already positive. The colors and tones correctly display on the film… but before we take a deep dive into the different types of reversal film, let’s look at the critical difference between C-41 and E-6.

Slide film is commonly referred to as “E-6” because the development process consists of 6 baths which include developer, stop, and fixer. Color negatives are referred to as C-41 and use a chromogenic color print film developing process.

E-6 – What’s In A Name?

Slide or color reversal film is referred to as E-6 due to the development process requiring six baths, including developer, stop, and fixer. E-6 slide film is a lot less forgiving as it has a lower ISO value but produces vivid color with evidence of finer grain. As a result, with the correct exposure when captured, images will be true to life and visually beautiful. E-6 also delivers stunning resolution and image sharpness, and when projected, the results are impressive.

Slide film has always had a fan following due to the instant results achieved with a positive slide. Regardless of framing the film or not, add a little light, and you have an instant view of the image in its correct colors. If you choose to frame your slides, a simple plastic frame is applied to review and protect them. The slides can also be viewed on a light table well ahead of any printing or scanning process.

Unfortunately, E-6 processing is becoming rarer as many retail store labs opt only for the cheaper and simpler C-41 machines. But, despite this, The Darkroom photo able continues to see a demand for slide film and E-6 processing.

Is slide film still available?

While some popular slide films have ceased in production, there are still many available from Kodak and Fujifilm in 35mm, 120, and even larger formats. FujiFilm never stopped producing slide film and currently sells three different types: Velvia 50, Velvia 100, and Provia 100f. With that in mind, we thought it would be a great time to compare some of the great E-6 options available today. Sadly, as you’ll discover below, many of the best slide films are no longer manufactured by the leading brands.

E-6 Film Processing

These days it can be difficult to find labs that process slide film, let alone labs that process it in-house. Here at The Darkroom, it’s one of our specialties! We have been dip & dunk processing E-6 slide film in-house since 1976.

Develop your E-6 Slide Film

C-41 – Popular By Demand

On the flip side is the color negative film, otherwise referred to as C-41 due to the processing technique. A technique that was developed and introduced by Kodak in 1972. A film that relies on C-41 processing is by far the most common film type available today. C-41 or color negative film is, as the name suggests, a negative with tone and color reversed once developed. The printing or scanning process reverses the color and tone to produce the positive image we see in prints and scans.

C-41 tends to be more cost-effective to purchase and develop – plus, the range of film available is considerable. A great benefit of the C-41 process is the ability to push-process a film for longer durations to obtain interesting results. Another interesting approach is to cross-process the E-6 slide film in the C-41 method. While the resolution in C-41 is not even close to E-6, the dynamic range and speed have more significant variance.

Kodak Ektachrome 100

Kodak Ektachrome 100

Kodak’s Ektachrome is a popular slide film that comes in 35mm and 120. It’s highly regarded for its rich detail and resolution, along with its vivid true-to-life colors and super fine grain. If you intend to shoot portraits or landscapes, it’s well worth taking a shot with the Ektachrome 100, provided you have suitable daylight exposure conditions.

Speed: ISO 100/21° | Balance: Daylight | Saturation: very high
Formats: 35mm & 120
Grain: RMS 8 – Extremely Fine Grain
Film Review


Velvia 50

Fujifilm’s Velvia is a lower-speed slide film that produces stunning color and ultra-fine grain. It also delivers far better tonal transitions and exposure latitude when compared to Fuji’s Velvia 100. The blend of Velvet and Media created the name Veliva – it’s an apparent reference to the velvet smooth photos produced from this slide film. If you wish to make the most of Velvia 50, it’s well suited to contrasting light conditions.

Fujifilm [Introduced 2007] Speed: ISO 50/18° | Balance: Daylight | Saturation: very high
Formats: 35mm, 120, 4×5. 220 & 8×10 are discontinued
Grain: RMS 9  |  Exposure: latitude ±½ stop
Film Review

fujifilm T64 35mm film

Fujichrome T64

Fujichrome T64 is a standout slide film introduced by Fujifilm in 2006 but was short-lived as its manufacture ceased. Considered a new film still, it delivers one of the highest levels of fine-grain seen in this speed. What’s more, its color reproduction is fantastic, and as it’s a Tungsten film, it casts a strong blue tone. If you shoot in the right daylight conditions, blues will be deliciously moody regardless of shooting architecture, interiors, or close work such as products. Further to this, it produced a rich gradation and gray balance.

Fujifilm [Introduced 2006] Film is no longer being manufactured.
Speed: ISO 64/19°  | Saturation: very high
Formats: 35mm, 120, 4×5 & 8×10
Grain: RMS 7  |  Exposure: latitude + 2/3 stop
Film Review



Kodak’s E100VS is yet another film that has met its fate, and they’ve stopped production. This color reversal film delivers incredibly vivid color saturation in daylight conditions. If you want to create high-color transparencies, E100VS is the go-to slide film for popping results. If you intend to capture the true color and dramatic hues in wildlife, food, and nature photography, this is the one…or at least it was.

Film is no longer being manufactured.
Film Review


Fuji Provia 100F

Fujifilm’s Provia 100F is another 100 speed film considered one of the most versatile of all the slide films Fuji offers. The professional quality film features good exposure latitude with excellent contrast and well-controlled color saturation. As a result, Provia 100F is an ideal slide film for portrait photography as it correctly replicates skin tones. It’s available in all standard formats, including 35mm, 120, 4×5″, and 8×10″. At least this one doesn’t seem to be going anywhere just yet.

Film Review

FujiFilm RAP Astia 100

Astia RAP

Another of Fujifilm’s 100 speed films is the Fujichrome Astia 100F (RAP 100F). It is a pro-quality color reversal film that delivers exceptionally fine gram. Thanks to its ability to capture strikingly smooth skin tones throughout the dynamic range, it’s also ideal for portrait photography. This discontinued film used Fuji’s Multi-Color-Correction Layer technology which delivers one of the highest levels of color fidelity in a film in this class. But it, too, is no more.

Film is no longer being manufactured.
Speed: ISO 100 | Grain: RMS 7
Film Review


Velvia 100

Fortunately, the Fujifilm Velvia 100 is still in production and is a 100 speed daylight slide film. It excels with its incredibly high color saturation to make images boldly pop where no slide film has popped before. Velvia 100 achieves this by using next-generation cyan, magenta, and yellow plus anti-fading properties to retain high saturation levels. Velvia is a popular choice for nature photography, including wildlife, flora, and even macro subjects.

Speed: ISO 100/21° | Balance: Daylight
Film Review

fpp retrochrome 400 35mm

FPP RetroChrome 400

FPP RetroChrome 400 is a bespoke film created from surplus government High-Speed Eastman Ektachrome color positive film. RetroChrome is well suited to journalism, sporting events, and industrial photography applications in daylight conditions with a fast speed. Despite daylight use, shoot this at the prescribed ISO of 400. It’s also worth noting that RetroCromie 400 is an expired 2004 cold-stored film stock.

Kodak Rolled by FPP | Speed: ISO 400
Find it at Film Photography Store
Film Review

Fuji Provia 400x

Fuji Provia 400x

The sad trend of discontinued Fujifilm slide film takes yet another before its time with the Provia 400X. Thanks to its 400 speed class, it is well suited to all lighting conditions and will work in any genre and deliver outstanding image quality. What’s more, it has a high saturation of color, fine grain, and exquisite sharpness.

Film is no longer being manufactured.
Speed: ISO 400| Grain: RMS 11
Film Review


Final Thoughts On Slide Film

While there are still plenty of options available for E-6 color reversal films, there’s undeniable mourning for those no longer in production. It’s disappointing to see that Fujifilm, in particular, has called it quits on several unique slide films. There’s a certain magic to seeing a developed E-6 slide and holding it up to the light or admiring it through a handheld slide viewer. It’s like a moment captured in a tiny world and perfectly framed. It’s no wonder that craft and second-hand markets feature stalls with boxes and boxes of pre-loved slides. What’s more, wanderers pack these stalls holding their E-6 slides up to the light. Grab your E-6 film and go out and shoot to see what you think of slide film photography.

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Slide Film and Portraits

Shooting with slide film is a great way to capture the vibrant colors of your subject. Slide films can also be used in portraiture because it has an ultra-fine grain, which will produce crisp and sharp images that are perfect for detailed closeups on people’s faces or other delicate details. However, when shooting this type of film remember that there isn’t as much exposure latitude given compared to color negative—so make sure you meter accurately!

Below are some portraits were taken with multiple different types of slide film. Photos by: Trev Lee

Click image to view larger

Kodak Portra 400 vs. FujiFilm Provia 100f

One of these is Kodak Portra 400 and the other is FujiFilm Provia 100f. Portra is Color Negative and Provia is E-6 slide film – both are great film that produces beautiful results but as you can see, have a very different look. Which is which and what film do you prefer?

Portra 160 vs. Provia 100F

Portra is a color negative film that has much better exposure latitude than the E-6 Provia slide, but on an evenly lit overcast day it’s harder to tell any difference between these two.

Can you tell which is which? (Hint – Portra is a warmer film!)

16 replies on “What Is Slide Film: An Introduction To Color Reversal & E-6”

Haven’t done E-6 in at least 15 years but we used steel tanks in a single Calumet sink and “dunked” everything from large format to 35mm in it. All the solutions were sitting in the same 100.5 degree Fahrenheit water bath, and we did the entire process in total darkness, by feel and a lumed clock.
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I shoot a ton of E6, it’s basically the same price as C41 in the case of shooting 120 film and home developing. There is but a slight premium on a film like Provia compared to Ektar or Portra, the E6 chemistry is also a little more expensive but if you do it at home it’s very manageable. The easier scanning is worth a lot too for me 🙂
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