Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. Collapse Details
    gelling cobs with parabolics
    #1
    Senior Member Peter C.'s Avatar
    Join Date
    Jul 2020
    Location
    Connecticut, USA
    Posts
    534
    Default
    Ive been having trouble gelling parabolics that have internal umbrella like ribs on the inside. They help quickly opening and closing but get in the way of attaching a gel. At the time I needed a parabolic, Aputure was out of stock, they have a better design that has an unobstructed center with a gel holder. On my last job the gel shifted touched the glass in front of the led chip, melting, sticking, and then smoking until all the residue burned off. Any ideas mounting gel without it burning.


    Reply With Quote
     

  2. Collapse Details
    #2
    Senior Member
    Join Date
    Mar 2012
    Location
    Australia
    Posts
    1,770
    Default
    Taping gels to the inside of a softbox is not fun (nor fast!).

    I'd sell your current soft box and get the aputure with gel holder. Otherwise if the softbox isn't too big, gel the outside where the diffusion is (maybe locally you can find a place that will cut a sheet for you rather than buying a roll).

    If there are velcro tabs for extra diffusion inside the softbox, you could use those to help with mounting. There may still be light getting past the gel but maybe it'll work enough to give you the CT you're after, or you can experiment with different strength gels that take the light leak into account.


    Reply With Quote
     

  3. Collapse Details
    #3
    Senior Member Peter C.'s Avatar
    Join Date
    Jul 2020
    Location
    Connecticut, USA
    Posts
    534
    Default
    This is what it looks like. I have been taping the gel but you can see how much of a pain it is. Btw this is Adorama Glow brand. It was only $55 and has served me well for my limited use. To bad there isn't an easy way to use gels
    parabolic inside.jpg
    Aputure looks like this
    light dome.jpg
    Last edited by Peter C.; 03-28-2021 at 07:00 PM.


    Reply With Quote
     

  4. Collapse Details
    #4
    Senior Member ahalpert's Avatar
    Join Date
    Apr 2011
    Location
    NYC
    Posts
    3,588
    Default
    that aputure looks nice. did you cut your gel into a circle? maybe you could clip it to the 4 spokes surrounding the cob if it were a little larger than the opening such that it could curl up into a bit of a dome? it might not end up gelling 100% of the light, but probably 98% of the light that makes it out of the unit

    a lot of times if i'm going quick and dirty, I just attach gels to the front of a softbox and cover as much of the area as I can. which is quick if I have large gels to work with. if I'm changing the color instead of adding diffusion, I don't worry that much if there's a little bit of ungelled area. but it sort of depends on the situation


    Reply With Quote
     

  5. Collapse Details
    #5
    Senior Member Peter C.'s Avatar
    Join Date
    Jul 2020
    Location
    Connecticut, USA
    Posts
    534
    Default
    right now I just have a square piece of gel that I awkwardly tape. my issue is gaining access to that area. there is a small zipper entry just big enough for my hand and the top access is blocked by the ribs. so maybe i just need a bigger piece of gel cut into a circle with a hole in the center to put on top of the ribs. the Aputure isn't a perfect solution either because the gel holder is only available in the larger version. The mini you need to swap the inner baffle to a gold one. I use these for quick travel setup where I often don't have the space.
    Last edited by Peter C.; 03-28-2021 at 07:40 PM.


    Reply With Quote
     

  6. Collapse Details
    #6
    Senior Member
    Join Date
    Mar 2012
    Location
    Australia
    Posts
    1,770
    Default
    You could try a sort of circular cone shape, it might just be a trapezoid strip etc. and place it on top of the ribs (side away from COB).

    Untitled.jpg


    Reply With Quote
     

  7. Collapse Details
    #7
    Senior Member
    Join Date
    Mar 2012
    Location
    Australia
    Posts
    1,770
    Default
    Quote Originally Posted by Peter C. View Post
    right now I just have a square piece of gel that I awkwardly tape. my issue is gaining access to that area. there is a small zipper entry just big enough for you hand and the top access is blocked by the ribs. so maybe i just need a bigger piece of gel cut into a circle with a hole in the center to put on top of the ribs. the Aputure isn't a perfect solution either because the gel holder is only available in the larger version. The mini you need to swap the inner baffle to a gold one. I use these for quick travel setup where I often don't have the space.
    Just saw this response. Yeah I'd avoid going under the ribs.


    Reply With Quote
     

  8. Collapse Details
    #8
    Senior Member Peter C.'s Avatar
    Join Date
    Jul 2020
    Location
    Connecticut, USA
    Posts
    534
    Default
    Quote Originally Posted by rob norton View Post
    Just saw this response. Yeah I'd avoid going under the ribs.
    great minds think alike


    1 out of 1 members found this post helpful.
    Reply With Quote
     

  9. Collapse Details
    #9
    Default
    I had the same softboxes by godox, and the westcott one with the same problem.
    The easiest solution is to get a different softbox, which is what I did.
    The "triopo" ones on ali express have the snap in rods and I just gel the inside with the large sheets (almost 2x2).
    The triopo ones are a bit shallow which is nice for space, but I wouldn't gel with the 600D as it would probably be too hot.
    They're also quite plasticky so I don't know how it will go with heavy use, I've only used them a few times so far.
    You can search for "triopo 120cm bowens"

    The laofas/nicefoto etc ones are more circular with more rods, and are twice the price
    Also an option is the Angle parabolic quick open ones on BH

    The aputure is smaller than the laofas ones, and 3 times the price of the triopo.

    I imagine you get what you pay for, since it's just OMB for me I went for the triopo, but for sure if you give it to someone else don't expect it to survive very long (although to be fair most softboxes are probably the same)
    That being said, the tripo is 1kg / 2.2lbs so it's very light.
    Last edited by scotchtape; 03-29-2021 at 10:58 AM.


    Reply With Quote
     

  10. Collapse Details
    #10
    Default
    This what I don't like about those Cob lights.


    Reply With Quote
     

Page 1 of 2 12 LastLast

Posting Permissions

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