Re: Mark "Snowflake" Cassino has some competition! :)
At 12:23 PM 2/25/2004 +, Kostas Kavoussanakis wrote: In http://www.its.caltech.edu/~atomic/snowcrystals/photo2/photo2.htm he says: "One suspects Bentley would have really appreciated PhotoShop." I wonder... I wondered about that too - though Wilson Bentley used to actually carve the emulsion off of the film to create his images (otherwise there was not enough contrast to print them.) - MCC - Mark Cassino Photography Kalamazoo, MI http://www.markcassino.com -
Re: Mark "Snowflake" Cassino has some competition! :)
At 05:23 AM 2/26/2004 -0500, you wrote: I believe I read somewhere that using polarizers can cause colors when shooting crystals. I don't know if the polarizers go on the light sources, on the camera, or both. I tried a polarizer on the lens, but it really did nothing. I know that there are color-enhancing polarizers that add slick colors to sunsets etc, but I've never tried one of those. The Rasmussen shots in particular look like two very carefully blended light colors are coming together, but my attempts at doing that resulted in one effective blended light. Maybe ROb's idea about LED's would let me focus the sources better. - MCC - Mark Cassino Photography Kalamazoo, MI http://www.markcassino.com -
Re: Mark "Snowflake" Cassino has some competition! :)
you shine a polarized light up through the crystal. you place another polarizer between the crystal and the camera lens. best effects are when the polarizers are crossed and the background is very dark. Herb... - Original Message - From: "Mark Cassino" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, February 26, 2004 1:22 PM Subject: Re: Mark "Snowflake" Cassino has some competition! :) > I tried a polarizer on the lens, but it really did nothing. I know that > there are color-enhancing polarizers that add slick colors to sunsets etc, > but I've never tried one of those.
Re: Mark "Snowflake" Cassino has some competition! :)
On 26 Feb 2004 at 19:26, Herb Chong wrote: > you shine a polarized light up through the crystal. you place another > polarizer between the crystal and the camera lens. best effects are when the > polarizers are crossed and the background is very dark. This method also is used to make visible stresses in transparent materials. http://osa.creol.ucf.edu/activities/birefringence.pdf Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
Re: Mark "Snowflake" Cassino has some competition! :)
i'm not sure snow crystals will show the same effect though. however, if it does work, it's pretty neat. side lighting with colored lights works best on transparent materials that don't show the effect. Herb - Original Message - From: "Rob Studdert" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, February 26, 2004 8:32 PM Subject: Re: Mark "Snowflake" Cassino has some competition! :) > This method also is used to make visible stresses in transparent materials. > > http://osa.creol.ucf.edu/activities/birefringence.pdf
Re: Mark "Snowflake" Cassino has some competition! :)
the best colors are with two polarizing filters, one on the light and one between the crystals and the camera. Don in Finland can tell you the details since he does it all the time in his photomicrography shots. i don't know if they have to be linear polarizers or whether circular ones will work too. Herb... - Original Message - From: "Lon Williamson" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, February 26, 2004 5:23 AM Subject: Re: Mark "Snowflake" Cassino has some competition! :) > I believe I read somewhere that using polarizers can cause > colors when shooting crystals. I don't know if the polarizers > go on the light sources, on the camera, or both.
Re: Mark "Snowflake" Cassino has some competition! :)
I believe I read somewhere that using polarizers can cause colors when shooting crystals. I don't know if the polarizers go on the light sources, on the camera, or both. Rob Studdert wrote: On 24 Feb 2004 at 17:10, Mark Cassino wrote: What I can't figure out is how these folks get the mixed lighting - the two colors - in their shots. I did tons of experiments using dual colored flashes (I usually use two flashes, one blue, one white) but I could not get the nice "liquid colors" that Rasmussen gets. I gotta keep experimenting I'd suggest playing about with a set of coloured high intensity LEDs before next season. If you could mount them on flexible arms you'd have a very controllable set of cold coloured illumination sources. I'm looking at setting up some 1W white LEDs for macro illumination.
Re: Mark "Snowflake" Cassino has some competition! :)
On 24 Feb 2004 at 17:10, Mark Cassino wrote: > What I can't figure out is how these folks get the mixed lighting - the two > colors - in their shots. I did tons of experiments using dual colored flashes > (I usually use two flashes, one blue, one white) but I could not get the nice > "liquid colors" that Rasmussen gets. I gotta keep experimenting I'd suggest playing about with a set of coloured high intensity LEDs before next season. If you could mount them on flexible arms you'd have a very controllable set of cold coloured illumination sources. I'm looking at setting up some 1W white LEDs for macro illumination. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
Re: Mark "Snowflake" Cassino has some competition! :)
Just saw this on a newsgroup: http://www.sciencephotography.com/users/ekinsman/snow2004/snow2004.html Nice snowflake shots! -- Mark Roberts On a Mac they melt (no screensaver...) ANdre
Mark "Snowflake" Cassino has some competition! :)
Just saw this on a newsgroup: http://www.sciencephotography.com/users/ekinsman/snow2004/snow2004.html Nice snowflake shots! -- Mark Roberts Photography and writing www.robertstech.com
