Expodisc anyone tried for Pentax custom WB


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woonsin

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Hougang
#2
Expodisc anyone tried for Pentax custom WB???
Yes, I heard of this but I remember few months ago I saw one thread that CS member suggested DIY home-made ExpoDisc by buying transparency mat (for use on floor above computer table) from IKEA. :D

Then cut into small square (close to size 77mm) and attach white paper. I was very surprised they worked bit ok almost as Expodisc. Sorry, I cannot find thread as it was long ago.

U can try your own DIY and test it yourself. :D Good luck
 

longko

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#3
Yes, I heard of this but I remember few months ago I saw one thread that CS member suggested DIY home-made ExpoDisc by buying transparency mat (for use on floor above computer table) from IKEA. :D

Then cut into small square (close to size 77mm) and attach white paper. I was very surprised they worked bit ok almost as Expodisc. Sorry, I cannot find thread as it was long ago.

U can try your own DIY and test it yourself. :D Good luck
I did that DIY with a twist. I put the mat onto the cheapo China WB cap and it instantly improve the WB.;)
 

longko

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#5
Does the transluscent mat you use on the fridge floor works by attaching white papaer to it.
Refer to http://www.clubsnap.com/forums/showthread.php?t=346975

I find that mat quite useful for diffuser also. Just made a macro diffuser with it, even when u bounced direct flash onto it, it'll help soften the light.
 

woonsin

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#6
Refer to http://www.clubsnap.com/forums/showthread.php?t=346975

I find that mat quite useful for diffuser also. Just made a macro diffuser with it, even when u bounced direct flash onto it, it'll help soften the light.
Hi Longko,
Yes, this thread is one. Wow, u found this thread which i failed to find. :thumbsup::bsmilie:

P3ntx
Hope this thread will give you idea how to homemake DIY ExpoDisc instead of buying too expensive price. :D
 

woonsin

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#7
Refer to http://www.clubsnap.com/forums/showthread.php?t=346975

I find that mat quite useful for diffuser also. Just made a macro diffuser with it, even when u bounced direct flash onto it, it'll help soften the light.
Hi Longko,
Yes, this thread is one. Wow, u found this thread which i failed to find. :thumbsup::bsmilie:

P3ntx
Hope this thread will give you idea how to homemake DIY ExpoDisc instead of buying too expensive price. :D
 

longko

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#9
i JUST diy mine cannot focus when place close to the len. doesn't work that well

Mine made of mat transparent and shower curtain as white paper.
This is how u use it;

1. Get ready your camera (if u need to use flash or set other settings do so)
Edit: Will be gd if it's Av mode, f4-6.3
2. Switch to MF
3. Goto custom WB setting
4. Point the camera to the location which u wanna shot
Edit: 4.5 Placed the DIY WB disc covering the lens.
5. Just press capture and set the WB based on center.

That's all. Remember to switch back to AF
 

#10
I tried again it work quite well, but not putting on the len but about an arm len distance to at the subject that enbale focusing rather than covering the len.

My DIY expodisc cannot be seem thro. how about yours.

Hi Woosin and Longko, do you both to the same any issues with your DIY ...

Thanks for your inputs.
 

longko

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#11
I tried again it work quite well, but not putting on the len but about an arm len distance to at the subject that enbale focusing rather than covering the len.

My DIY expodisc cannot be seem thro. how about yours.

Hi Woosin and Longko, do you both to the same any issues with your DIY ...

Thanks for your inputs.
The idea is not to focus, but to get the exposure. Meaning the lightings in ur shots. If you wanna focus on something, I suggest u use a white/grey card.
 

scorpioh

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Jul 17, 2007
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Woodlands
#13
This is how u use it;

1. Get ready your camera (if u need to use flash or set other settings do so)
Edit: Will be gd if it's Av mode, f4-6.3
2. Switch to MF
3. Goto custom WB setting
4. Point the camera to the location which u wanna shot
Edit: 4.5 Placed the DIY WB disc covering the lens.
5. Just press capture and set the WB based on center.

That's all. Remember to switch back to AF
Sorry, I can't get the last part. Do you mind explaining the exact buttons to use? Thanks.
 

P3ntx

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#14
I have tried my DIY expodisc, unnsually good white-balance, tested here are the three shots, manual len, but still I am not sure what/which is a correct WB, I think I prefer best white balance than correct WB. Perhaps the correct WB with original expodisc could be better, but I have never try it.

K100D+Super Takumur 1:3.5 /35mm, Vivo City, Harbour Front:


http://flickr.com/photos/nc_chia/2553140269/

http://flickr.com/photos/nc_chia/2553982058/

http://flickr.com/photos/nc_chia/2553937222/
 

longko

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#15
Sorry, I can't get the last part. Do you mind explaining the exact buttons to use? Thanks.
Check ur manual or if u going for the gathering, ask some bro abt it. It's easier to show in person.
 

longko

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#16
I have tried my DIY expodisc, unnsually good white-balance, tested here are the three shots, manual len, but still I am not sure what/which is a correct WB, I think I prefer best white balance than correct WB. Perhaps the correct WB with original expodisc could be better, but I have never try it.

K100D+Super Takumur 1:3.5 /35mm, Vivo City, Harbour Front:


http://flickr.com/photos/nc_chia/2553140269/

http://flickr.com/photos/nc_chia/2553982058/

http://flickr.com/photos/nc_chia/2553937222/
IMHO, expodisc works best in mixed lightings and outdoor sunny/grey sky. The DIY gives u close result to the real thing, DIY <$1, original $190. If u like warmer effect the white penatx body cap is gd.
 

woonsin

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Hougang
#17
Hi longko & Woosin,

Thanks for all your wise technical understanding, so it still works being out of focus.
Hi, p3ntx

I am not wise but I only happened to see this thread but never tried this. No time to make one for myself. Congrats to your DIY ExpoDisc successfully.
 

P3ntx

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#18
Thank you all,

I am learning so much from these inputs, having used my K100D for the past three years it is still a discover.

http://www.flickr.com/photos/nc_chia/2557302925/

http://www.flickr.com/photos/nc_chia/2558120064/

http://www.flickr.com/photos/nc_chia/2557293495/

Having been advised that it was close to the real thing, I made little post processing to the warmer side.

So I next question was what is the exact tentancy to cause the WB incline to the Warmer and Cooler temperature, so we could further improvish the accuracy with fine-tuning WB cap.

I do test these w/o much thinking, but only guesses from Clubsnaper inputs.
 

longko

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#19
Thank you all,

I am learning so much from these inputs, having used my K100D for the past three years it is still a discover.

http://www.flickr.com/photos/nc_chia/2557302925/

http://www.flickr.com/photos/nc_chia/2558120064/

http://www.flickr.com/photos/nc_chia/2557293495/

Having been advised that it was close to the real thing, I made little post processing to the warmer side.

So I next question was what is the exact tentancy to cause the WB incline to the Warmer and Cooler temperature, so we could further improvish the accuracy with fine-tuning WB cap.

I do test these w/o much thinking, but only guesses from Clubsnaper inputs.
From my own understanding, material thickness and the opacity of the material. Like transparent material with certain cuttings will give cooler or more white result. Translucent material like the pringles cap or the white body cap will give a slightly warmer result. Sorry I'm not much of a theory guy:bsmilie:
 

#20
Yap! the same thought.

I end up with Three WB Caps..becuase at night low light so have to use more transparent..otherwise the custom will show NG on the LCD.

Cap food container cover similar to those Pringles chips type.

a bit of fine-tuning.

http://www.flickr.com/photos/nc_chia/2565107954/
 

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