[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
RE: [APML] Vignette Correction Software - Found!
Just for the information of readers of this thread. PWPro anti-vignetting corrects only for a certain type of falloff that happens in wide angle camera lenses. It is not intended to fix falloff from a hard stop in a telescope optical path, which is what is faced 90% of the time by readers of this list. Furthermore, the advanced AV techniques espoused by Sean Walker and myself can correct for a wide variety of problems including OAG prism shadow, skyglow gradients, etc.
I don't doubt that the PWPro falloff filter isn't helpful. However it is not (and never can be) as effective as more complex methods that utilize the skills of an experienced person.
Matt
At 02:23 PM 7/3/2002, Chris Schur wrote:
>Bill, the light fall off filter in PWpro can be set to a FL and film size.
>I set the film size to 35mm and lens FL to about 25mm. I use the two bolt
>holes in the bottom of the schmidt to attatch it with 1/4-20 bolts to the
>back of my 12.5 inch scope. does your have these mounting holes?
>
>Chris Schur
>
>Astrophotography: http://www.psiaz.com/schur/astro/index.html
>
>-----Original Message-----
>From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
>Behalf Of William R. Mattil
>Sent: Tuesday, July 02, 2002 8:42 PM
>To: astro-photo@seds.org
>Subject: Re: [APML] Vignette Correction Software - Found!
>
>
>> Chris Schur wrote:
>>
>> I would like to thank all of those out there that made the numerous
>> suggestions for correcting vignetts in my schmidt camera images. The
>> most versitile and recomended was Picture Window Pro, and I found its
>> superior ability to correct my images was so superior to fumbling
>> around in Photoshop with gradients, I was in awe! Thanks to all of
>> you, now i know why I am so fond of belonging to this group. Ive
>> posted my before and after images here:
>>
>> http://www.psiaz.com/Schur/astro/filmimagepages/vignette1.html
>>
>> for your viewing. Again, I am indebted to all of you for your help!
>>
>
>Chris,
>
>Wow ! ... what a difference. I would be interested in hearing about how
>the image is actually processed. Also, how are you mounting the 5.5"
>Camera ? I am curious because I have one but am not sure of the ring
>size needed (parallax) or if there are alternative methods.
>
>Thanks for sharing
>
>Bill
>
>--
>William R. Mattil | Fred Astaire wasn't so great.
>wrmattil@ix.netcom.com | Ginger had to do it all backwards
>(972) 399-4106 | and... in high heels.
>
>-- APML Archives at <http://astro.umsystem.edu/apml/> ---
> Unsubscribe at <majordomo@seds.org>
>
>
>-- APML Archives at <http://astro.umsystem.edu/apml/> ---
> Unsubscribe at <majordomo@seds.org>
--
Matt BenDaniel
matt@starmatt.com
http://starmatt.com
-- APML Archives at <http://astro.umsystem.edu/apml/> ---
Unsubscribe at <majordomo@seds.org>