Just so I understand it better, how does the Rollei TLR infra-red filter compensate for the IR focus shift?
On 29/07/2011, at 9:07 PM, CarlosMFreaza wrote:
Taking as reference the opaque Hoya R72 IR filter that allows to pass dark red and infrared above 720nm, the Rollei Infra-red filter allows to pass dark red and infrared rays above 700nm, it would be a R70 filter, close to the Hoya and then you can take your films exposures with this Hoya R72 as basis, f.e.Aura rate at 1/1.5 ISO, Aperture f/16, 1 - 8 seconds exposure (suggested in the Freestyle website). Rollei TLR infra-red filters have the advantage they already are compensated for the focus shift in IR photography, I forgot to mention it in my blog.- Carlos 2011/7/29 hari ho <hariho@xxxxxxxxxxxxxxx>:Thank you for the information Carlos. I have a Rollei RIII Infrarot filter (extremely dark red, much darker than R25) that I'll be using with EfkeIR820 and Efke IR820 Aura film. I do know that exposure and filtercompensation for this is very much trial and error. However, does anyone have data or experience as to where I should begin in terms of bracketing myexposures? Thanks. Hari On 29/07/2011, at 1:28 PM, CarlosMFreaza wrote:I have uploaded to one of my blogs some Rollei B&W filters tables, Rollei Red and Orange filters instructions in several languages, a photograph with filters samples and some comments, the images are thumbnails and it's necessary to click on them: http://dobleobjetivo.blogspot.com/2011/07/rollei-b-filters.html Carlos --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with'unsubscribe' in the subject field OR by logging into www.freelists.org- Online, searchable archives are available at //www.freelists.org/archives/rollei_list--- Rollei List - Post to rollei_list@xxxxxxxxxxxxx- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'in thesubject field OR by logging into www.freelists.org- Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with'unsubscribe' in thesubject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list--- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with'unsubscribe' in the subject field OR by logging into www.freelists.org- Online, searchable archives are available at //www.freelists.org/archives/rollei_list
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