lungov

I have just finished an adaptation in a Durst Laborator 1000, condenser head, and changed it to a diffuser head using LEDs. I am very much surprised with the results. Highlights: 1) It is incredibly fast, that means, a lot of light output compared with the former lightbulb I was using. A few seconds with lens stopped down to f/32 is enough for a 2x magnification from 4x5. 2) It uses a micro-controller (Arduino family) to mix green and blue light in order to get contrast control. That makes very easy to use different contrast in different areas of the same print (more troublesome with filters). I made a video showing one print made with it: More technical details about the project can be found at https://apenasimagens.com/en/enlarger-head-using-leds/ For those of you who have thought or considered LEDs, I would like to say: go for it, it is really a step change.

<p>Rodeo,<br> Try reading again the linked article. Maybe a in a second try you will understand it better.<br> Wagner </p>

<p>Dear all,<br /><br />This is just a LF curiosity. A guy over here in Sao Paulo adapted a bicycle to carry his camera, darkroom and all that is needed for collodion shooting and development. This is a link with pictures that show him when he was making Ferrotypes and Ambrotypes in an cultural event last Saturday. I found it awesome.<br /><br /><a href="http://apenasimagens.com/en/wet-plate-bicycle-roger-sassaki/" target="_blank">http://apenasimagens.com/en/wet-plat...roger-sassaki/</a></p>

<p>Hello, After Rodeo Joe feedback, I just uploaded a final version:<br /><br />1- Not cluttered by share buttons<br />2- Improved for viewing in smart-phones and tablets<br />3- Using v and u, for image and object distances to lens in the English version. <br> I kept i and o representing image and object sizes (height/width in relation to lens axis). They are proportional to u and v and both ratios represent the magnification as Rodeo pointed out. It is possible to circumvent them. I checked the classic Photo-Technique (H.J.Walls - Focal Press 1954), and indeed the author does not name specifically image and object sizes. He uses only u, v and M for magnification, in describing lens' behavior. Nevertheless I find these figures (i and o) useful as we normally think of film and subject sizes, like a full length portrait, bust or face to be rendered in 4x5, 5x7 etc.<br> An Android or OS app would be nicer. Unfortunately I don't know how to code in those languages. I coded this one using Javascript and Canvas. But I think now it is working almost like an app. It is true that it needs a browser, but it fits entirely in a mobile screen so you can forget the browser. I think it is already nicer than Excel as it provides a graphic view alongside with figures. At least for me, that gives a sort of reassurance.</p>

<p>Thanks for you feed back. I didn't know about share buttons cluttering the screen. I only use a desktop for that. I will check what I can do with this wordpress template.<br> Conventions are different in different countries and languages. But you are right, in the English version I will substitute by the u and v.<br> I didn't understand your point about "i" and "o". There are some different ways to get to the same result. My idea was to build a quick simulator to answer the question that comes so often to my mind, specially when I spot an attractive lens for acquisition: what can I so with this lens with the cameras I have?<br> For exposure, I didn't want to use aperture because in nowhere else it is mentioned in the simulator. But I agree again that N*v/f is far more friendly. <br> Thanks again. <br> Wagner</p>

<p>Hello,<br> This is something that might be useful for those projecting large format cameras or trying to figure the behaviour of a new combination lens/camera. So many times I took paper and pencil and went through these calculations that I decided to do it once for all. I hope you will like it. Case you find any trouble, or have any suggestion for improvements, please get in touch. This is a sort of beta version. Cheers. Wagner<br> the page address is:<br> http://apenasimagens.com/en/focal-length-distances-and-framing</p>