Btw this is one of those shots). The Reciprocity calculator app for Ilford gives me extremely different times. ( Log Out / Yes, it’s Toom kirik (St. Mary’s Cathedral) which is located in the Old town. :-), Most film manufacturers provide you with graphs on which you can search for your measured time and then read your corrected time. ( Log Out / Um unsere Webseite für Sie optimal zu gestalten und fortlaufend verbessern zu können, verwenden wir Cookies. But most of the time you do not find the exact time you measured, that ´s why some of the manufacturers provide you with the so-called (most of the time) “P factors”. I calculated the times from 1m with a “P factor” for T-Max 100, which was also given to me, directly by Kodak. Thanks! I corrected that now you will find the answer in the article. That’s why I contacted with my brother (and his name is… Boris Shminke! Keep that in Mind. I stopped calculating at 20m measured time Mostly 50s+ (usually you find further information in the datasheet of the Film. Sexy 50´s Styled Shoot in Medium Format and 35mm. Means that most of the time the formula only works with higher measured exposure times. My congratulations to you because this later is happening now It’s not a bit but finally I decided to put it here. For those who want to see some results of over and under exposing Portra watch this video by Kyle McDougall. For the prof. Kodak colour negative films Kodak tolled me as follows: One of the tags was for Kodak Gold 200, but I didn’t see a chart for Kodak Gold 200. Everything I could find was such charts. Thus I’ve got shots I wanted with this exposure correction. 6 seconds, aperture F8.P.S. But I’m a dull beggar and I needed formula or a huge chart which I saw for Fomapan 100. I wrote here in September that I’ll write something about Kodak T-max 100 reciprocity failure «a bit later». Here it is: It may not work for sure. In simple terms, Reciprocity means, that when you expose your film to the light for (most of the time) longer than one second, I tested some exposure pairs and it worked. have a nice time. So I decided to go with the values directly from Ilford’s data sheet. Before Kodak T-max 100 I used only Fomapan 100, which reciprocity failure is ideally written here. The following GDPR (General Data Protection Regulation) rules must be read and accepted: This form collects your name, email and content so that we can keep track of the comments placed on the website. Very useful, (I was really bad at maths at school ) am thinking of trying more night time photography.The last image is great, I’m guessing it’s Estonia by the style of the architecture. but just so you do not have to search around here the answer i got from Kodak: General for a city light scene you can ignore reciprocity failure and expose at ISO 100 f8 or f11 to capture car light trails. For Kodak T-Max 400, I Also got the “P factor” directly from Kodak. Kodak´s official Reciprocity Diagram ends at 100sec measured time (1,40min). Therefore you have to alter your exposure time to get a correctly exposed image. Times were taken from another online resource, I could not find an exact table in Kodak´s datasheets. ), Here is the Formula. For Tri-X, the “P factor” is 1.54. This is called film reciprocity. Here you find some Reciprocity tables for the most used Films. Where can I find that reciprocity chart? Before Kodak T-max 100 I used only Fomapan 100, which reciprocity failure is ideally written here. You can see my Night Photography for examples of my work. ( Log Out / My Exposure Calculator web app is one way of estimating exposures, light meters don’t work too well at night. In picking the methodology, my intent was to limit variability to the film alone as much as practically possible. since to me it started making no sense to use even longer times. So if something happens I myself can easily find the numbers I need. Also, keep in mind that this value only works from 50s (measured time ) up. Finally, a shot without a pair. I calculated the times based on the datasheet of Ilford with the following formula also mentioned in the beginning of the article: Tc=TM^p (TC= Time Corrected TM= Time Measured p=1,31 (P is a factor calculated following a range of exposure times, provided by Ilford) ), You can find the Values for the different Ilford film HERE. When I bought Kodak T-max 100 I had to find some information about its reciprocity failure, because I planned to shoot with it using long exposures also.
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