jacktang

Do you know that Leitz had a high sharpness developer ?

Leica high sharpness developer

In 1939 Heirich Stockler of Leitz came out with a developer which gave highest possible sharpness without loss of speed

Solution A

metol 5 gram

sodium sulphite 100 gram

in 1000 cc water

Solution B

borax 10 gram

in 1000 cc water

develop film in solution A for 2-5 minutes 68 degree F

follow by development in solution B for 3 minutes

Do not rinse film between baths

Source Aaron Sussman The Amateur Photographer's Handbook

The 110 format film available now is color only, which I cannot develop my self. I want to shoot B&W 110 film which I can develop at home.

So the only way is to use a film slitter to cut ASA 100 35mm film into

16mm wide film strips, and reload into an empty 110 cassette

Another alternative is to use a 35mm film to 16mm slitter

http://d6d2h4gfvy8t8.cloudfront.net/18254619-md.jpg

I bought a stainless steel film slitter from Jimmy Li in Hong Kong many years ago

The 16mm film width is exactly 16m

Standard Film Sizes - Antique and Vintage Cameras

I try to reload 16mm bulk film into 110 cassette for my Pentax auto 110 film camera.

The currently available 16mm bulk film are low speed type (ASA 25), cannot be use

in pentax 110, which need at least ASA 100.

In a 1950 book published 1952 in Singapore there is a quote from American Photography

1939 March edition a formula which can increase film speed from ASA 8 to ASA 450, a film speed boost to 40x.

However one of his ingrediant Johnson & Johnson Swerl was discontinued long time ago

Any one knows any film speed booster developer, when can boost ASA 25 TO ASA 100