Magic Lantern / Petzval Lens

More results using the Magic Lantern lens, this time I decided using 4x5 negatives instead of roll film. I still haven't figured out a way of using this lens outdoors due to the fact that there's no shutter or F stops to control the amount of light.

I guess I could use waterhouse stops to do that but it could take the whole effect away, another option would be adding ND filters in combination with a very slow film. A friend at filmwasters also suggested me the Harman direct positive paper which is ISO 3 and I guess that could work...

For these indoor shots the exposure time were between 4 and 6 seconds. The film is Ilford Delta 100 ISO 4x5 and processed with Rodinal 1:100 dilution, one hour stand development.

 

Magic Lantern / Petzval Lens

I’ve recently acquired a couple of 19th Century Magic Lantern lenses and I was really looking forward to do this test.

Magic Lanterns were the predecessors of slide projectors and the page below it's a great source of information:

http://www.magiclantern.org.uk/events/events4.html

I mounted one of the lens in a piece of cardboard and put in my 4x5 Toyo camera. For this particular test I was trying to get the exposure time correct as most of Magic Lantern lens haven’t got an aperture setting to control the light.

A bit of resource and  I found out that the focal length is 195mm and the aperture is about 4.5, for this reason a low speed film (25 ISO) it’s definitely something to consider.

I used 100 ISO roll film (because I couldn’t wait until I get some 4x5 25 ISO!). This is a cheaper alternative but I won’t be able to see the lens effect in full, but since I’m more interesting in the exposure times for now it’s fine.

The film is Fuji Across 100 and I processed in Rodinal 1:100 solution.

The results came out slightly darker than I wanted, the exposure time was about 1 and 2 seconds and considering I'm using 100 ISO and a lens cap as a shutter it's not that bad. It will definitely improve when I buy a 25 ISO and with a 4x5 negative I'll also be able to see more of the lens effect, they're known for giving a sharp image in the midle and quite a lot distortions around the edges.