|Ensign Folding Klito de Luxe No.9|
|Ilford G.30 Chromatic plate, Ensign Folding Klito|
|Ilford FP4 plate, Ensign Folding Klito|
|Kodak Orthochromatic plate, Ensign Klito|
|Kodak P.1200 Panchro-Press plate, Ensign Klito|
|Ensign Folding Klito de Luxe No.9 with Ica Dominar lens|
|Entrance to a Park, FP4 plate, Ensign Klito with Ica Dominar lens|
|Park at Night, Ilford G.30 Chromatic plate, Ensign Klito with Ica Dominar lens|
In same lot as the quarter-plate FP4 and G.30 plates that I've tested and used with the Ensign Klito above, there were three boxes of plates, which didn't have a size on them, but were in slightly larger boxes than the others. These were 9x12cm plates, which I shot with a Voigtländer Avus with a f4.5 Skopar lens; I've also got a Kodak Recomar 33, but this has a slower lens, and less suited to night photography.
The three boxes (all previously opened) contained Barnet Line-Tone (Thin Film) plates, Ilford H.P.3 and Ilford Soft Gradation Panchromatic plates. The Barnet Line-Tone plates were too heavily fogged to scan, although an image was discernable against a bright light, from three successive exposures at 10 EI.
H.P.3 - Hypersensitve Panchromatic plates were introduced in 1943. Before the 1960 change in meter settings these were rated at 200 ASA. The box style suggests these plates are from the late 1940s to the 1950s. According to Silver By The Ton, HP4 was first produced in rollfilm as early as 1960 and sheet film in 1964: it may not have been produced as a glass plate, and it doesn't appear in the plates list in the Appendix of Silver By The Ton. The Technical Information Sheet for HP3 plates from the Ilford Technical Information Book is dated 1961, so HP3 plates were produced alongside HP4 in rollfilm for a period. For the test below, I metered for 100 EI, and took four successive exposures.
Soft Gradation Panchromatic plates were introduced by Ilford in 1928. This emulsion was later given the designation R.10, and post-1960 were rated at 100 ASA. These were the first plates I shot last year, in a smaller size, and gave good results. The box of the 9x12cm Soft Gradation Panchromatic plates has an earlier packaging style, possibly dating back to the 1940s. I metered for 50 EI, and gave the plate three successive exposures. The results were as good as the same plates from the 1960s, and suggest 25 to 12 as a usable exposure index.
|H.P.3 plate test, Voigtländer Avus|
|Soft Gradation Panchromatic plate test, Voigtländer Avus|
|Telephone Exchange, Ilford H.P.3 plate, Voigtländer Avus|
|Telephone Exchange, Barnet Line-Tone plate, Voigtländer Avus|
Silver by the Ton - A History of Ilford Limited 1879-1979, RJ Hercock and GA Jones
Ilford Technical Information Book Volume 2