polarizer effectiveness with SX100 - General Help and Assistance on using CHDK stable releases - CHDK Forum

polarizer effectiveness with SX100

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polarizer effectiveness with SX100
« on: 19 / July / 2019, 09:37:40 »
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Hi,
       I have fitted my SX100 with a (clip on) polarizing filter; but since it does not have a viewfinder, it is rather difficult to see the subtle  effect of the filter on the screen, especially in bright sunlight.
       I'm thinking that either the histogram or zebra applicatins may be able to help me to determine when the polarizer is at it's optimal rotation, but am not really sure which application (if either) will help, what settings to use, and what to look for.
       Any suggestions are appreciated.
Thanks,
..... john

Re: polarizer effectiveness with SX100
« Reply #1 on: 19 / July / 2019, 10:24:06 »
Use the Camera in M Mode (with fixed ISO) and watch the exposure step bar. The bar should go to minimum.
M100 100a, M3 101a, 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), 2*S45,
Flickr https://www.flickr.com/photos/136329431@N06/albums
YouTube https://www.youtube.com/channel/UCrTH0tHy9OYTVDzWIvXEMlw/videos?shelf_id=0&view=0&sort=dd

Re: polarizer effectiveness with SX100
« Reply #2 on: 19 / July / 2019, 13:11:17 »
Hi c_joerg,          What do you mean by the "exposure step bar"?Thanks,..... john

Re: polarizer effectiveness with SX100
« Reply #3 on: 19 / July / 2019, 14:27:53 »
This picture is from my S110.….
M100 100a, M3 101a, 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), 2*S45,
Flickr https://www.flickr.com/photos/136329431@N06/albums
YouTube https://www.youtube.com/channel/UCrTH0tHy9OYTVDzWIvXEMlw/videos?shelf_id=0&view=0&sort=dd


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Re: polarizer effectiveness with SX100
« Reply #4 on: 19 / July / 2019, 15:19:28 »
This picture is from my S110.….
That's not available on sx100.

So, alternatives while the cam is in M mode with fixed ISO:
- exposure hint in half press (on the Canon OSD)
- Bv (brightness value) on the CHDK Misc values display
- CHDK histogram

Re: polarizer effectiveness with SX100
« Reply #5 on: 19 / July / 2019, 17:40:58 »
That's not available on sx100.
Ok, I have read over the x  ;)
M100 100a, M3 101a, 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), 2*S45,
Flickr https://www.flickr.com/photos/136329431@N06/albums
YouTube https://www.youtube.com/channel/UCrTH0tHy9OYTVDzWIvXEMlw/videos?shelf_id=0&view=0&sort=dd

Re: polarizer effectiveness with SX100
« Reply #6 on: 20 / July / 2019, 13:15:42 »
Hi c_joerg,        I don't see that on my camera...... john
This picture is from my S110.….

Re: polarizer effectiveness with SX100
« Reply #7 on: 21 / July / 2019, 05:45:33 »
Hi c_joerg,        I don't see that on my camera...... john
This picture is from my S110.….
Yes, I know. I Thought you have a S100. Follow Reply #4
M100 100a, M3 101a, 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), 2*S45,
Flickr https://www.flickr.com/photos/136329431@N06/albums
YouTube https://www.youtube.com/channel/UCrTH0tHy9OYTVDzWIvXEMlw/videos?shelf_id=0&view=0&sort=dd


Re: polarizer effectiveness with SX100
« Reply #8 on: 21 / July / 2019, 16:40:36 »
OK ........ john
Hi c_joerg,        I don't see that on my camera...... john
This picture is from my S110.….
Yes, I know. I Thought you have a S100. Follow Reply #4

 

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