Jansjo diffusion, sharpness tips

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ctron
Posts: 187
Joined: Thu Jan 28, 2016 12:30 pm

Jansjo diffusion, sharpness tips

Post by ctron »

For you folks using the Jansjo constant lighting work lamps, what sort of set up and diffusion are you using? So far, I haven't had much luck with them. I think I was diffusing too much, then too long of exposures and then the result too soft. Thanks.

Harald
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Location: Steinberg, Norway
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Post by Harald »

Hi there ctron,
I use both Jansjo and fibre optic light. I have had great success with ping pong balls. Drill a hole in them and put it on the light.
Beware that there are different qualities in the balls. I´ve tested cheap ones vs Stiga *** Champion. There is one full f-stop difference. The walls in the cheap balls are thicker.
I´ve read about using those balls here on the forum, so it´s not my idea.

Hope this helps?
Kind Regards
Harald

Lier Fotoklubb / NSFF
AFIAP / CPS
BGF / GMV
http://www.500px.com/blender11

concon
Posts: 87
Joined: Thu Jun 01, 2017 6:21 am

Post by concon »

I second the ping-pong ball suggestion. I used them for speedlight diffusion and they worked wonders-

I purchased these ones: http://a.co/ceb28HK

I needed a larger area to move my subject around so I'm using 3d printed half-spheres that slip/lock onto my objectives (think half or a Poke'ball). The ping-pong balls worked right out of the gate; I'm still working out the perfect thickness and such for my 3d printed ones.

Deanimator
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Joined: Tue Oct 23, 2012 7:01 pm
Location: Rocky River, Ohio, U.S.A.

Post by Deanimator »

I use ping pong balls as well.

I still use a small card stock diffuser around the subject as well.

ray_parkhurst
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Location: Santa Clara, CA, USA
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Post by ray_parkhurst »

I do 2 levels of diffusion with Jansjos:

- first level is to remove the lens from the Jansjo and replace it with a disk of vellum. This is sufficient to eliminate the "pinpoint" nature of the LED.

- second level is to place another sheet of vellum an appropriate distance away from the subject (coins in my case). I then move the diffused Jansjos (usually 2) to shine onto the vellum sheet, moving them closer or farther from the sheet to adjust the amount of diffusion.

Sharks
Posts: 388
Joined: Sun Jun 30, 2013 8:05 am
Location: Turkey

Post by Sharks »

Just a plastic cup works awesome :)

Image2017-Set-12 by Can Tunçer, on Flickr

Image2017-Set-13 by Can Tunçer, on Flickr

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mawyatt
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Joined: Thu Aug 22, 2013 6:54 pm
Location: Clearwater

Post by mawyatt »

Sharks,

That's what I use often, sometimes with a white foam cup and sometimes with another larger "cone" surrounding the smaller one. I mostly use flash though, as the foam and double diffusion really "eats" up the light.

Best,

Mike

Beatsy
Posts: 1648
Joined: Fri Jul 05, 2013 3:10 am
Location: Malvern, UK

Post by Beatsy »

Ping pong balls here too. For double diffusion, I got a couple of Godox AD-S17 dome diffusers from China and hacked them to surround said ping pong ball. They're 12cm diameter and can be lit from the outside, or bounce light inside them for a bit more brightness. Use one on it's own like a large ping pong ball for bigger specimens. I find them very useful and they block surprisingly little light given their thickness.

http://www.ebay.co.uk/itm/Godox-AD-S17- ... 2183245837

JH
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Location: Vallentuna, Stockholm, Sweden
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Post by JH »

When I use my copy stand I like to use some food containers from IKEA and sometimes lamp shades also from IKEA.
http://www.ikea.com/gb/en/products/cook ... -50149560/

http://www.ikea.com/gb/en/products/ligh ... -00328352/

The containers works with leds, the lamp shades are better with flash.

To soften the flash light for the picture of the Oyster: http://www.photomacrography.net/forum/v ... 518#218518 I used this box from IKEA:

http://www.ikea.com/gb/en/products/smal ... -00186395/

Best regards
Jörgen Hellberg
Jörgen Hellberg, my webbsite www.hellberg.photo

Macro Photog
Posts: 92
Joined: Sat Dec 13, 2014 11:45 am

Post by Macro Photog »

I've used copy paper cut to size taped to the lamp lens and my new favorite is the plain white plastic top of over the counter medicines. They often have an insert in the cap that needs to be removed. If they are taped just right they can easily be flipped up for more direct lighting (and you don't lose them!). Warning some do give a warmer tone but considering IKEA lighting isn't exactly the WB standard :) it can be corrected in your favorite editing program.

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