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Omar Lopex

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Posts posted by Omar Lopex

  1. Hi Gregg,

    Thanks again for the info!

    So I called up Watson to ask if the 12V DTAP (http://www.poweredbywatson.com/product/13607/Watson-VM_98_SHL-Li_Ion-Slim-V_Mount-Battery-with-LED-and-USB-Output-(14.4V,-98-Wh))

    …is regulated. I was told is not, but it spikes at a max 16V (and has up to a 10A draw).

    According to other BL threads I’ve read, the camera can take up to 16V (I’ve order the Arri 35 BL Book but it hasn’t arrived yet so can’t confirm) — but it feels like I’m pushing my luck topping out the camera to its max threshold.

    If I did though, I assume I would just run an un-regulated DTAP-to-XLR cable?

    I’ve searched for NiCad/NiMh options but haven’t found any that are small enough to be worth it.

    I did however just come across this: 

    https://www.bhphotovideo.com/c/product/1048193-REG/bescor_fp_12vatm_12v_lithium_ion_battery.html/specs?ap=y&ap=y&smp=y&smp=y&smpm=ba_f2_lar&lsft=BI%3A514&gad_source=1&gclid=Cj0KCQiAm4WsBhCiARIsAEJIEzXs-l64Fp65ObOvY_T9hbgnkj0xgF039nFJS3pi7sIZ4xvuPqMjEGkaAjHNEALw_wcB

    12.6 operating voltage and 8.8AH — am I correct in assuming this battery is powerful enough (and not too powerful) to run the BL- Evolution?

  2. Hi Gregg,

    Thanks for the idea!

    I assume this is the adapter you mentioned?

    https://indiprotools.com/products/d-tap-to-4-way-female-d-tap-splitter-12v-8a-regulated?_pos=6&_sid=13daa0aef&_ss=r

    So in theory, I would just replace the DTAP split with an XLR connector that I chop off of this:

    https://indiprotools.com/products/b-stock-d-tap-to-4-pin-neutrik-xlr-female-cable-32-non-regulated?_pos=32&_sid=0288bd508&_ss=r

    And I’m good to go?

  3. Thanks again David, for that link to the BL4 battery thread, and for your patience.

     

    Does anyone have any examples of Li-Ion battery rigs they use on a BL4?

    I’m still reticent to put my own rig together, even with all these specs, because (fault of my own) I still can’t make heads or tails of what all the electronics specs mean.

    The Visual Products battery rig is bigger than I’d like, but if I can’t find any setups that have already been tried and tested I guess I’ll just end up going that route.

     

    I just feel like someone somewhere has to have a Li-Ion V Mount setup on a BL4, I’ve seen it on Arri 235’s and LTs… but my searches online yield nothing.

  4. Hi David,

    Thanks for that suggestion.

    Should I just use a DTAP to XLR adapter without a regulator?

    If I did I assume there would be a danger of the 14.4V battery being too strong?

    My main concern is not frying the electrical components of the BL.

    -Omar

  5. Hi All,

    I read through the previous topics on here about options for powering a BL Evolution.

    Still wondering though, would this Li-Ion battery work as a power source?

    https://www.bhphotovideo.com/c/product/1430083-REG/watson_vm_98_shl_watson_98wh_slim_vmount.html/specs

    It says the DTAP is a 12V output, but just to be safe, should I pair it with this regulated adapter?

    https://indiprotools.com/products/12ptifb

    I’ve seen that Visual Products has a 12V battery w/XLR available, but this Li-Ion setup would be lighter and less bulky to use.

    Any help/advice would be appreciated.

    Thanks!

  6. Frank: Thanks for the book recommendation. This is my first go at this & I had assumed I would be able to work with a rough sketch of the final image, shoot the live-action first, & then have the matte produced afterwards. I can understand doing the matte first, then live-action (like shooting wide then doing closeups), but is it absolutely necessary to do it that way, or do you think I can do it in the order I have planned?

     

    David: Thanks as well. I had assumed I would film the mattes (after getting digital scans of live-action footage), process/scan the matte footage, & put together in after effects. Shooting the matte in-camera (on glass) seemed like too many variables to take care of on this first attempt. Is there a better/easier workflow to compost the images?

  7. Hi All,

    I’m preparing to shoot a couple scenes that will involve using hand-painted mattes (a là Black Narcissus, Star Wars, etc).

    One shot is day exterior on 35mm Kodak 200T, the other is night interior on 35mm 500T. Below are basic storyboards.

    Other than exposing correctly (at +1 for these particular stocks) is there anything else I should take into account to make the eventually composting with hand-painted titles easier/better?

    Thanks in advance for any advice.
     

    BF426C37-99D4-42FD-B690-230D1A77F69C.thumb.jpeg.10ddcb5f8ded44e081a105f67e289771.jpegED20950A-9EC4-472E-8AFB-730A375AD85A.thumb.jpeg.46a25b7962544bc0da8034960c195e93.jpeg

  8. Does anyone have image grabs of frames that show the supposed streak that happens in the S16 space when the mirrors are not adjusted?

    Image grabs that show the scratch marks in S16 space when the magazine is not modified?

    I'm converting my SRII to Ultra-16 to avoid costs of Super-16 conversion, but want to double-check if I can't just go all the way and do the S16 conversion, then just crop around the streaked/scratched parts (if by chance they tend to happen only on corners?).

    My camera has already been modified to use M42 mount 35mm lenses, so realigning the lens shouldn't be necessary, and I can frame by eye without a realigned viewfinder, so the only concern is scratches/streaks on the film.

  9. I'm looking for an ND filter that goes behind the lens (so it doesn't darken the viewfinder) on a CP-16R.

     

    I see the little slot for the lenses, and I've read of people referring to them in the forums, but I can't find them when I search online to purchase.

     

    Do they have a specific name? Are they a universal size / interchangeable among camera models?

    The guy at my local vintage/used camera store sort of knew about them but said he didn't remember what they were called.

  10. Hi Jay,

     

    Thanks for your reply. The only thing is that you can see the flicker through the entire test, even in the shots indoors.

    In all the different lighting schemes, the flicker is the same, I think it's just more noticeable in the overexposed shot.

     

    And the flicker is in the center of the frame, not the edges, like I'm led to believe the CP-16R with bow tie shutter causes.

  11. Hi, not sure what forum this belongs in.

     

    I did a very short camera test for my CP-16R. I have a CP-16A which I've shot with and never had problems, but I bought this R model to use prime lenses on it instead of the standard angenieux.

     

    I have the bow-tie or butterfly model that is infamous for light streaks in the upper right corner, so I was testing for that. It doesn't look like I got any of the streaks people associate with this model (maybe I didn't have bright enough subject matter in the upper corners?)

    but...

    there is a subtle (but constant) flicker in the center of the frame. It looks like what might happen when you take your eye away from the viewfinder, but a camera operator of mine made that mistake once last year and I since then I always make sure to keep my eye firm against the viewfinder.

     

    Wondering if it could be because I shot at 12FPS (to save film stock and development/telecine $$)? I did forget to tell the lab that I shot in the slower frame rate. Could that affect the way they telecined it and caused flicker during telecine that aren't on my negative?

     

    I remember when I tried to DIY telecine some Super 8 footage at home by removing my DSLR's lens and projecting straight onto the sensor, the image was great but I ended up with white streaks and flicker every 4-6 frames, and I guessed it was because the projector was old and I couldn't get an exact frame rate out of it (adjusting the frame rate knob would worsen or better the light streaks).

     

    Or is it more likely a light leak somewhere?

     

    If it's a light leak could I solve this problem by enclosing the camera in a dark bag during filming (which could also act as a second sound blimp anyways)?

     

    I'm going to run another camera test before I start principle fotography, but wanted some advice on what to try and change for the second test. Here is a link to the video of the test: https://vimeo.com/226261458

     

    Any help/input is appreciated.

     

    -Omar Lopex

    ana-film.com

  12. I had an adaptor machined to fit a set of 35mm super takumar lenses (28mm, 35mm, 135mm, M42 thread) onto the CP mount of a CP-16R. I have used these lenses before with a K3 with no problems.

     

    I have the CP-16R model with a bow tie shutter and have just recently become aware of the smearing problem they are notorious for.

     

    -will the coating on the super taks help avoid the smearing?

    -will stopping down to F8 and smaller help avoid smears?

    (I will be shooting on vision 50d and 250d, using mostly natural light but also some 1ks for indoors)

     

    Any advice in how to avoid smearing, and any precautions I might not be aware of in using these m42 primes on the camera, would be greatly appreciated.

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