Further Alexa LF Details Hit the Streets

Credit: Charles Haine
Further details regarding the exciting new Alexa LF were released at an open house with AbelCine.

The announcing of the Alexa LF was big news when it was released a few weeks ago, and now ARRI has begun a roadshow to spread further technical details about the new camera body and lenses. It's also giving users a hands-on opportunity with the platform. Last weekend, rental house AbelCine held an open house in their new space in Brooklyn's Industry City, and reps from ARRI gave a presentation and showed-off some footage on perfectly calibrated Sony HDR monitors. 

Credit: Charles Haine

One detail we hadn't noticed on the Alexa 65 (and this goes for the Alexa LF as well) is that not only is the sensor just 2 normal ALEV sensors placed together, but you can actually see the seam when looking directly at the sensor. It doesn't come off amazingly in photographs, but it is clear to the naked eye and you can see the seam if you look carefully at these accompanying images. It goes without saying that the seam won't show up in your final imagery, but the image is made from those two sensors, and the next time we find ourselves around an Alexa 65, we'll be sure to take a look at the sensor.

Credit: Charles Haine

We were also able to get our hands on a few of the ARRI Signature Primes (as well as view a price list, with individual lenses going for as much as $40k/each). While larger, the new LPL mount is, of course, similar to LP, but the large mount allows for a massive rear element that is visually striking. However, the lenses themselves were made from magnesium and, while physically larger than some competitive full frame primes, these felt surprisingly light, with many examples coming in around 2kg/4lbs.

Credit: Charles Haine

Also covered were the improvements to the lens data system. Not only does the PL-to-LPL adapter pass through lens data (which is always appreciated), but the lens data system has been upgraded on the LF and signature primes and is now capable of capturing accurate focus/iris/zoom information of up to 150fps. Considering the increasing prevalence of slow motion work and need for lens data on VFX workflows, this is an appreciated improvement.

Credit: Charles Haine

After interviewing users of the Alexa 65 system, ARRI discovered that many of them were only using the center area of the chip for most of their capture. Why? It lined up so well with existing full frame glass. While larger than full frame glass exists (and ARRI has several lines dedicated to covering the full Alexa 65 sensor), the center cut was so popular that they felt that they could make an LF sensor that covered that area while still happily servicing a large portion of their large format users.

Credit: Charles Haine

In many ways, this makes the Alexa 65 feel more like the original D20 and D21 cameras that ARRI created before the full Alexa came out. Those were also rental-only (like the 65), used as test platforms to find out what people actually wanted from their Digital Cinema cameras. While we're confident that the Alexa 65 will continue to have certain applications, it seems likely that the ARRI LF is really the camera that will take off for most users. It has the same sensor size that "most users" used on the 65 with a body size only slightly larger than an SXT W, and it's designed to work with a much wider variety of lenses. Yes, you don't get 6K, but so what? If you want to buy it, you can actually buy it. ARRI is clearly more focused on volume and there will be more of them subsequently released as rental options.  

For more info check out that ARRI LF site. Jon Fauers Film & Digital times has also done a downright exhaustive exploration of the Alexa LF that is worth a look.

Tech Specs

  • 36.7 x 25.54mm maximum sensor size
  • 4448x3096 maximum capture resolution
  • 150fps possible in 2.39x1 4448x1856 ARRI Raw
  • ALEV IIII Sensor
  • A2X layout
  • Brand new LPL lens mount
  • Ships with LPL to PL adapter
  • 44mm flange focal distance
  • 12mm wider and longer than standard Alexa
  • 2x 6G SDI and 1 1.5G SDI monitor outputs
  • 16 bit linear image processing to Wide Gamut / Log C Space

Your Comment


Cool. Added to cart.

February 12, 2018 at 10:36AM


"Yes, you don't get 6K, but so what?" You also don't get 4k with a S35 lens... so you have to either shoot full sensor with Arri's proprietary primes or in essentially a cropped sensor mode for vista vision glass instead of lenses you may have been intending to use.

The camera is an answer to only half the problem, since DPs want to be able to get a 4k+ image on the glass they want to use. Having a new camera that still only gets 3.4k when cropped safely for S35 seems counter-intuitive at their $122,700 with a 1TB mag and $128,900 with a 2TB mag price point.

February 12, 2018 at 6:05PM

Ryan Hamelin
Director/DP/MoVi Operator

It is UHD at super35 which is all is necessary. Professional DPs dont give a damn about numbers, otherwise Arri alexa's wouldnt be the most popular cameras for films in eveything from the oscars to sundance.

February 13, 2018 at 7:37AM


"Yes, you don't get 6K, but so what?"

You also don’t get framing room for situations like VFX, among other things. What a silly comment.

February 13, 2018 at 3:17PM, Edited February 13, 3:17PM

Henry Barnill
Director of Photography

Seems more like an overpriced gimmick camera. 4.5K in 2018? Way to show up late in the game, Arri. Now you can play with the big boys, Amazon/Netflix.

February 14, 2018 at 8:26AM, Edited February 14, 9:08AM

Executive Producer

If it aint broke don't fix it. And the ALEV sensor is not broken, thats for sure. Changing the pixel density of the sensor would probably ruin the whole image coming from the Alexa. So yes, if you want to shoot a Netflix gig on the Alexa you have to pick a full format lens if its not cool for you, you can chase the K's with the Red system and be happy with it.

February 15, 2018 at 1:50AM


Completely unrelated question to the LF, but I saw a while back a rig that went into the back of a car and arc'd out either side so you'd be able to dolly the camera from outside the drivers side, through the back seat, and then out the passenger side window. It was a carbon fibre, motorized slider like thing. I have been searching for hours trying to find it again so thought this would be a good place to ask!


February 15, 2018 at 1:58AM