Thread: Helium VS Alexa LF side-by-side test

Reply to Thread
Page 2 of 2 FirstFirst 12
Results 11 to 18 of 18
  1. #11  
    Senior Member Patrick Tresch's Avatar
    Join Date
    Aug 2007
    Location
    Switzerland, Lausanne
    Posts
    5,362
    Strange orange on the LF, are they RED? What color are the stripes?
    Reply With Quote  
     

  2. #12  
    I've done the Helium/Dragon/Alexa LF/Alexa Mini test:

















    I'll posting the results soon!
    Producer

    Red Epic-W Helium 8K
    Red Epic-X Dragon 6K
    Reply With Quote  
     

  3. #13  
    Senior Member Kemalettin Sert's Avatar
    Join Date
    May 2009
    Location
    Los Angeles CA
    Posts
    3,362
    Im curious about the color strips on spyderchecker..Is it Orange or not ?
    Reply With Quote  
     

  4. #14  
    Senior Member
    Join Date
    Dec 2010
    Location
    Toronto & Vancouver
    Posts
    4,175
    That's awesome! Please post a few .r3d/.ari frames (or super short clips).

    OH MAN! Is that are those MF Focal Reducers on the Dragon and Alexa Mini? Ha!
    Reply With Quote  
     

  5. #15  
    Senior Member
    Join Date
    Mar 2013
    Location
    Los Angeles
    Posts
    340
    Quote Originally Posted by Laszlo Mohacsi View Post
    I've done the Helium/Dragon/Alexa LF/Alexa Mini test:

















    I'll posting the results soon!
    wow! is this from a camera check out?..i would have given you my arri 416 to make it really interesting if I knew..
    Reply With Quote  
     

  6. #16  
    Quote Originally Posted by Mike P. View Post
    That's awesome! Please post a few .r3d/.ari frames (or super short clips).

    OH MAN! Is that are those MF Focal Reducers on the Dragon and Alexa Mini? Ha!
    Yes, it's the Kipon Baveyes Pentax 67 to Red medium format focal reducer. It reduces the IMAX size Pentax lenses down to the Dragon sensor creating an IMAX-like image. It also increases the exposure by 1-stop. However, the Pentax 67 lens on the Alexa Mini is mounted via an EF adapter without any focal reduction.

    Yep no problem. Will be uploading the following to wetransfer for others to download and work with:

    Red Helium 8K .r3d
    Red Dragon 6k .r3d
    Arri Alexa LF 4.5K .ari
    Arri Alexa Mini 4K .mov (the Mini I used for the test did not have the RAW license so I shot ProRes 4444)
    Producer

    Red Epic-W Helium 8K
    Red Epic-X Dragon 6K
    Reply With Quote  
     

  7. #17  
    Okay, so here's the results from the test (which I decided to do without colour charts and instead framed all cameras against a window)...

    Camera settings were the following:

    800iso
    24fps
    180 degree shutter
    5600K
    T4

    The Helium and Dragon were set to 8K (8:1) and 6K (6:1) respectively. Both cameras used IPP2 and low-light OLPFs

    The LF was set to LF 2.39:1 4.5K arriraw

    The Mini was set to 4K UHD ProRes 4444 as it did not have the raw license

    First up, here is a screen grab from each camera in Log (LOG3G10 for RED and LOG-C for ARRI)

    Helium Log (with Leica 80mm)

    LF Log (with Leica 50mm)


    Dragon Log (with Pentax 90mm)

    Mini Log (with Pentax 55mm)


    Second, we have the same with REC709 luts.

    The RED cameras used: RWG_Log3G10 to REC709_BT1886 with LOW_CONTRAST and R_4_VerySoft size_33 v1.13.cube
    The ARRI cameras used: AlexaV3_K1S1_LogC2Video_Rec709_EE.cube

    Helium Rec709 (with Leica 80mm)

    LF Rec709 (with Leica 50mm)


    Dragon Rec709 (with Pentax 90mm)

    Mini Rec709 (with Pentax 55mm)


    So there's several things to note here: The Dragon combined with the 1-stop focal reducer measures accurately in terms of ISO alongside the other 3 cameras. If I were to put the same focal reducer on the Helium, the Helium would measure 1 stop faster than the LF and Mini. So, the Dragon is typically 1-stop slower than the other cameras even when all 4 are set to 800iso.

    The 90mm Pentax 67 lens combined with the focal reducer on the Dragon has a wider angle of view to the Pentax 55mm on the Alexa Mini. The Helium with the 80mm Leica appears to have an almost similar angle of view to the 55mm + Mini. This demonstrates the benefit of the larger sensors with Red cameras.

    Naturally, the LF sensor is larger than all (twice as large as the sensor in the Mini). I'd be happy to compare it to the Monstro one day.

    Dynamic range is excellent and essentially identical on all cameras, though if there's a difference, it's likely only noticeable in extreme stress-test lighting conditions.

    Given this, ALL 4 cameras are brilliant.

    What do you guys think?
    Last edited by Laszlo Mohacsi; 02-26-2021 at 03:27 AM.
    Producer

    Red Epic-W Helium 8K
    Red Epic-X Dragon 6K
    Reply With Quote  
     

  8. #18  
    Senior Member
    Join Date
    Oct 2010
    Posts
    1,307
    Quote Originally Posted by Laszlo Mohacsi View Post
    Okay, so here's the results from the test (which I decided to do without colour charts and instead framed all cameras against a window)...What do you guys think?
    I think people will be wondering why you didn't shoot something that would allow for more of the different cameras characteristics to be compared.

    It's already known they're all good cameras.

    Speaking for myself, I was just waiting out of curiosity to see something that would let me explore and compare the different image qualities that each camera captures.

    Did you shoot more than that window shot?
    Reply With Quote  
     

Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts