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Jansjo diffusion, sharpness tips

 
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ctron



Joined: 28 Jan 2016
Posts: 186

PostPosted: Sat Feb 27, 2016 12:25 pm    Post subject: Jansjo diffusion, sharpness tips Reply with quote

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.
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Harald



Joined: 13 May 2011
Posts: 395
Location: Steinberg, Norway

PostPosted: Sat Oct 07, 2017 10:55 am    Post subject: Reply with quote

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?
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Harald

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concon



Joined: 01 Jun 2017
Posts: 60

PostPosted: Sat Oct 07, 2017 11:06 am    Post subject: Reply with quote

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.
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Deanimator



Joined: 23 Oct 2012
Posts: 367
Location: Rocky River, Ohio, U.S.A.

PostPosted: Sat Oct 07, 2017 1:31 pm    Post subject: Reply with quote

I use ping pong balls as well.

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



Joined: 20 Nov 2010
Posts: 1076
Location: Santa Clara, CA, USA

PostPosted: Sat Oct 07, 2017 7:39 pm    Post subject: Reply with quote

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.
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Sharks



Joined: 30 Jun 2013
Posts: 279
Location: Turkey

PostPosted: Sun Oct 08, 2017 2:58 am    Post subject: Reply with quote

Just a plastic cup works awesome Smile

2017-Set-12 by Can Tunçer, on Flickr

2017-Set-13 by Can Tunçer, on Flickr
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mawyatt



Joined: 22 Aug 2013
Posts: 984

PostPosted: Sun Oct 08, 2017 8:40 am    Post subject: Reply with quote

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
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Beatsy



Joined: 05 Jul 2013
Posts: 911
Location: Malvern, UK

PostPosted: Sun Oct 08, 2017 9:26 am    Post subject: Reply with quote

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-Wide-Angle-Soft-Focus-Shade-Dome-Diffuser-for-WITSTRO-AD200-AD360-/332183245837
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JH



Joined: 09 Mar 2013
Posts: 945
Location: Vallentuna, Stockholm, Sweden

PostPosted: Sun Oct 08, 2017 10:11 am    Post subject: Reply with quote

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/cookware/food-storage-organising/reda-food-container-set-of-5-round-transparent-white-blue-art-50149560/

http://www.ikea.com/gb/en/products/lighting/shades-bases/j%C3%A4ra-lamp-shade-white-art-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/viewtopic.php?p=218518#218518 I used this box from IKEA:

http://www.ikea.com/gb/en/products/small-storage-organisers/clothes-organisers/skubb-box-white-art-00186395/

Best regards
Jörgen Hellberg
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Macro Photog



Joined: 13 Dec 2014
Posts: 92

PostPosted: Mon Oct 09, 2017 8:10 am    Post subject: Reply with quote

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 Smile it can be corrected in your favorite editing program.
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