Quote:

---

I had a modified 20D (Hutech's Type Ia filter modification--that's the replacement of the stock filter with one that blocks UV and IR but still allows Ha through).

I used custom white balance images to get good color reproduction for regular daytime photos. Here are some examples:

http://www.californiastars.net/album/londonireland/pages/0002_uk_stpauls_alley.html

http://www.californiastars.net/album/londonireland/pages/0017_uk_towerbridge_night.html

http://www.californiastars.net/album/londonireland/pages/0024_uk_buckingham_victoria_wide.html

http://www.californiastars.net/album/londonireland/pages/0055_uk_bath_landscape.html

http://www.californiastars.net/album/londonireland/pages/0080_ire_rockofcashel.html

http://www.californiastars.net/album/londonireland/pages/0102_ire_dingle_bird.html

http://www.californiastars.net/album/londonireland/pages/0111_ire_cliffsmoher_obrien.html

http://www.californiastars.net/album/londonireland/pages/0126_ire_house_table.html

http://www.californiastars.net/album/londonireland/pages/0146_ire_doolough_delphiriver.html

Most of them are straight from the camera (after taking and applying a custom WB) but I did have to tweak some of them in Photoshop (when I wasn't very diligent about taking new WB images when the lighting changed).

Here's an example of an image without and with a custom white balance image (the custom white balance image itself is the small rectangle in the middle):

http://www.californiastars.net/images/help/custom_white_balance.jpg

Here's another one:

http://www.californiastars.net/gallery/other/customwhitebalance.jpg

There are also filters you can use instead of white balance images. You either need a filter that's placed in front of the mirror of the camera or on the front of the lens. Each has its drawbacks. Here's a short article I wrote about this:

http://www.californiastars.net/article_dslr_regular.html

Can you tell I've thought a little about this?

Hope it helps.

- Danny

---

Hey Danny...when you say you work with the white balance, is that the white balance in the camera settings or is it something that you fool with in PS? I have a 40D but don't want to modify it because I use it for daytime stuff. If it's nothing more than playing with the white balance in the camera, I may send it to Hutech.

Thanks! David

--------------------
Proud Member; PAS NOLA,

"If we knew what we were doing, it wouldn't be called research..."
A. Einstein

Post Extras:

Quote:

---

"Mod your camera! It will not effect it for daylight use."

I wouldn't want anyone to get the wrong idea. It absolutely affects your camera for daylight use, without a doubt, no question whatsoever.

The issue is what you have to do to get pictures to look normal again. Sometimes people use their DSLRs a lot for regular use and don't want to have to deal with filters and white balance images. When that's the case, modding is not the route to go.

And for those who are really critical about photography, it can also affect autoexposure modes and the accuracy of those settings.

That said, most people, even those who consider themselves advanced amateurs, aren't going to notice any problems with the exposure settings and are going to be able to overcome the color issues without too much trouble. But to say it doesn't affect daylight use is incorrect and misleading to those who aren't familiar with the issues.

Best.

---

Well if you are someone who only uses the little green box for automatic mode on his canon then yes modding your camera will create some issues. But I don't think someone whose primary interest is astro photography falls into that category.

--------------------
http://www.pbase.com/rkn/astro&page=all

Vixen Sphinx SXW
Meade sn6
Canon EF 200mm f/2.8L II USM Lens
Hutech 1000d
Self modded 350d
ST8300c on order
DSI PRO II



Bob

Post Extras: