Filters question on DSLR

Archived from groups: rec.photo.digital (More info?)

I bought a Red filter today to use with my Canon 350D when taking B&W
photos.

It wasn't until I got home I realised that in the settings of the 350, are
actually one that simulates a Red, and most other colour filters, by toning
them down before writing to the CF card.

Has anyone else tried this out? Given it's the photos are in digital form
anyway are the results going to be as good as a real filter? Does anyone
know if you need to use filters with digital?

If so, I am trying to work out as well how many stop I have to increase
exposure. Is there a universal measure depending on the filter factor?

It would be great if the internal electonic filters work as well as the
camera has all the colour you can imagine.

Cheers

Alex

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Archived from groups: rec.photo.digital (More info?)

You can do it with a filter; the in camera exposure meter should adjust
automatically.
However there are many ways in Photoshop to accomplish what you want to do
with better control over the amount of red that is effectively blocked in
the final b&w image. Any full color image you create can be manipulated in
this fashion. This is not the same as simulating the effect of, say, a
polarizer. This is actually manipulating the amount red, green or blue that
will make up the final black and white image starting with normally created
color image.

Reply to Anonymous

Archived from groups: rec.photo.digital (More info?)

In article <dgklig$5g0$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com>,
"Alex" <alex.cruse@btinternet.com> wrote:

> I bought a Red filter today to use with my Canon 350D when taking B&W
> photos.
>
> It wasn't until I got home I realised that in the settings of the 350, are
> actually one that simulates a Red, and most other colour filters, by toning
> them down before writing to the CF card.

(Just a note here: Red filters let MORE red through. That is why they
look red, they are letting the red light hit your eye.)

>
> Has anyone else tried this out? Given it's the photos are in digital form
> anyway are the results going to be as good as a real filter? Does anyone
> know if you need to use filters with digital?
>
> If so, I am trying to work out as well how many stop I have to increase
> exposure. Is there a universal measure depending on the filter factor?
>
> It would be great if the internal electonic filters work as well as the
> camera has all the colour you can imagine.
>
> Cheers
>
> Alex

I haven't tried it, but I don't think using filters on a digi for B&W
makes economic sense. Digital cameras always capture RGB (?) regardless
if it is set for black and white or color. The channels can be adjusted
after the shot to create the filter you want.

http://www.bythom.com/bandw.htm
http://www.ephotozine.com/techniqu [...] ?recid=292

Black and white films are generally less sensitive to red light and the
red filter lets more red through, correcting, or exaggerating for effect.

I guess it could provide a different look on digital since the filter
letting more red through but I think that is silly since you are loosing
real information to manipulate.

Did that make any sense?

Some links I had around on the subject of digital, filters:
http://www.photo.net/equipment/filters.html
http://www.scphoto.com/html/filters.html
http://www.schneiderkreuznach.com/ [...] afie_e.htm
http://www.northlight-images.co.uk [...] black-and-
white.html

--

Photographs by Christian Bonanno
http://home.nc.rr.com/christianbonanno/

Reply to Anonymous

Archived from groups: rec.photo.digital (More info?)

Alex wrote:

> I bought a Red filter today to use with my Canon 350D when taking B&W
> photos.
>
> It wasn't until I got home I realised that in the settings of the 350, are
> actually one that simulates a Red, and most other colour filters, by toning
> them down before writing to the CF card.
>
> Has anyone else tried this out? Given it's the photos are in digital form
> anyway are the results going to be as good as a real filter? Does anyone
> know if you need to use filters with digital?
>
> If so, I am trying to work out as well how many stop I have to increase
> exposure. Is there a universal measure depending on the filter factor?
>
> It would be great if the internal electonic filters work as well as the
> camera has all the colour you can imagine.

You will probably find that colored filters don't perform as
well on your digicam as they do with film. The results won't
be the same.

For one thing, film doesn't have a white balance that is always
trying to find white in the scene. Considering that you *can't* turn
off white balance, what white balance were you using with your
red filter ? Tungsten, sunny, shady ? They'll all produce *different*
results.

There is a kelvin setting within your camera.. You can do all the
cooling and warming you want with this feature.. If you shoot RAW,
you can fine tune it on your desktop and do a far better job than
any film shooter with a filter can do.

With post processing using a program like Adobe Photoshop, you can go
even further.. You can duplicate the effect of just about every color
filter imaginable. If you're good at layers and gradients, you can
even simulate graduated neutral density filters..

The only filters that really can't be duplicated in post processing are
solid neutral density and polarizing filters.

Reply to Anonymous

Archived from groups: rec.photo.digital (More info?)

OK thanks guys, you confirmed my thoughts exactky. Given all the original
colour information is there, I can post manipulate them in Photoshop/Paint
Shop Pro.

As you also say, better to leave the filter off and capture more natural
info as well to start with.

I'll take the lense back and also have a read of the links you supplied.

Thanks once again !!

Alex

"Alex" <alex.cruse@btinternet.com> wrote in message
newsgklig$5g0$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com...
> I bought a Red filter today to use with my Canon 350D when taking B&W
> photos.
>
> It wasn't until I got home I realised that in the settings of the 350, are
> actually one that simulates a Red, and most other colour filters, by
toning
> them down before writing to the CF card.
>
> Has anyone else tried this out? Given it's the photos are in digital form
> anyway are the results going to be as good as a real filter? Does anyone
> know if you need to use filters with digital?
>
> If so, I am trying to work out as well how many stop I have to increase
> exposure. Is there a universal measure depending on the filter factor?
>
> It would be great if the internal electonic filters work as well as the
> camera has all the colour you can imagine.
>
> Cheers
>
> Alex
>
>

Reply to alex

Archived from groups: rec.photo.digital (More info?)

"Alex" <alex.cruse@btinternet.com> wrote in message
newsgklig$5g0$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com...
>I bought a Red filter today to use with my Canon 350D when taking B&W
> photos.
>
> It wasn't until I got home I realised that in the settings of the 350, are
> actually one that simulates a Red, and most other colour filters, by
> toning
> them down before writing to the CF card.
>
> Has anyone else tried this out? Given it's the photos are in digital form
> anyway are the results going to be as good as a real filter? Does anyone
> know if you need to use filters with digital?
>
> If so, I am trying to work out as well how many stop I have to increase
> exposure. Is there a universal measure depending on the filter factor?
>
> It would be great if the internal electonic filters work as well as the
> camera has all the colour you can imagine.
>
> Cheers
>
> Alex
>
Post processing for deep color filter effects makes sense to me. The
spatially arranged color cells on the Bayer sensor may cause visible
aliasing artifacts when pre filtering. I tried putting solid color filters
on a compact digital once and indeed, the effect was made quite visible.
I'll have to try it on my Rebel.

Anyone else try this?
-S

Reply to Anonymous

Archived from groups: rec.photo.digital (More info?)

"Alex" <alex.cruse@btinternet.com> wrote in message
newsgklig$5g0$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com...
>I bought a Red filter today to use with my Canon 350D when taking B&W
> photos.
>
> It wasn't until I got home I realised that in the settings of the 350, are
> actually one that simulates a Red, and most other colour filters, by
> toning
> them down before writing to the CF card.
>
> Has anyone else tried this out? Given it's the photos are in digital form
> anyway are the results going to be as good as a real filter? Does anyone
> know if you need to use filters with digital?
>
> If so, I am trying to work out as well how many stop I have to increase
> exposure. Is there a universal measure depending on the filter factor?
>
> It would be great if the internal electonic filters work as well as the
> camera has all the colour you can imagine.
>
> Cheers
>
> Alex
>
Post processing for deep color filter effects makes sense to me. The
spatially arranged color cells on the Bayer sensor may cause visible
aliasing artifacts when pre filtering. I tried putting solid color filters
on a compact digital once and indeed, the effect was made quite visible.
I'll have to try it on my Rebel.

Anyone else try this?
-S

Reply to Anonymous

Archived from groups: rec.photo.digital (More info?)

"Alex" <alex.cruse@btinternet.com> wrote in message
newsgklig$5g0$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com...
>I bought a Red filter today to use with my Canon 350D when taking B&W
> photos.
>
> It wasn't until I got home I realised that in the settings of the 350, are
> actually one that simulates a Red, and most other colour filters, by
> toning
> them down before writing to the CF card.
>
> Has anyone else tried this out? Given it's the photos are in digital form
> anyway are the results going to be as good as a real filter? Does anyone
> know if you need to use filters with digital?
>
> If so, I am trying to work out as well how many stop I have to increase
> exposure. Is there a universal measure depending on the filter factor?
>
> It would be great if the internal electonic filters work as well as the
> camera has all the colour you can imagine.
>
> Cheers
>
> Alex
>
Post processing for deep color filter effects makes sense to me. The
spatially arranged color cells on the Bayer sensor may cause visible
aliasing artifacts when pre filtering. I tried putting solid color filters
on a compact digital once and indeed, the effect was made quite visible.
I'll have to try it on my Rebel.

Anyone else try this?
-S

Reply to Anonymous

Archived from groups: rec.photo.digital (More info?)

"Alex" <alex.cruse@btinternet.com> wrote in message
newsgklig$5g0$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com...
>I bought a Red filter today to use with my Canon 350D when taking B&W
> photos.
>
> It wasn't until I got home I realised that in the settings of the 350, are
> actually one that simulates a Red, and most other colour filters, by
> toning
> them down before writing to the CF card.
>
> Has anyone else tried this out? Given it's the photos are in digital form
> anyway are the results going to be as good as a real filter? Does anyone
> know if you need to use filters with digital?
>
> If so, I am trying to work out as well how many stop I have to increase
> exposure. Is there a universal measure depending on the filter factor?
>
> It would be great if the internal electonic filters work as well as the
> camera has all the colour you can imagine.
>
> Cheers
>
> Alex
>
Post processing for deep color filter effects makes sense to me. The
spatially arranged color cells on the Bayer sensor may cause visible
aliasing artifacts when pre filtering. I tried putting solid color filters
on a compact digital once and indeed, the effect was made quite visible.
I'll have to try it on my Rebel.

Anyone else try this?
-S

Reply to Anonymous

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