Glycin stand development

[Alan Johnson]

Two forms of apparent sharpness with CHS100 II.

Mainly acutance effect within the emulsion (PC-512 Borax) and mainly adjacency effects in solution (GSD10 semi stand)

 

[chuckroast]

Two forms of apparent sharpness with CHS100 II.

Mainly acutance effect within the emulsion (PC-512 Borax) and mainly adjacency effects in solution (GSD10 semi stand)

Interesting stuff. The monitor doesn't do a wonderful job of showing the nuances of difference, but it looks like the GSD with CHS II is overall the subjectively sharpest. Do you concur?

 

[Alan Johnson]

It's quite possible that the adjacency effect may be confined to CHS 100 II which was closely matched to the old Efke 100/ CHS100 Art and that it is not so significantly found with newer films including the FP4 type 517 I tried.

CHS 100 type II now available in 120

Just in time for the holliday season: CHS 100 type II is now available in 120 as well. Europeans can shop directly: http://www.fotoimpex.de/shopen/films/adox-chs-100-ii-120-medium-format-film.html We introduced CHS 100 type II as a follow up to our beloved CHS 100 type I which Fotokemika took...

www.photrio.com

So regarding modern films Lachlan & Co are likely right, apparent sharpness is mostly related to acutance in the emulsion.

 

[chuckroast]

It's quite possible that the adjacency effect may be confined to CHS 100 II which was closely matched to the old Efke 100/ CHS100 Art and that it is not so significantly found with newer films including the FP4 type 517 I tried.

CHS 100 type II now available in 120

Just in time for the holliday season: CHS 100 type II is now available in 120 as well. Europeans can shop directly: http://www.fotoimpex.de/shopen/films/adox-chs-100-ii-120-medium-format-film.html We introduced CHS 100 type II as a follow up to our beloved CHS 100 type I which Fotokemika took...

www.photrio.com

So regarding modern films Lachlan & Co are likely right, apparent sharpness is mostly related to acutance in the emulsion.

Once difference is that the Efke "100" emulsions were ISO 200 and I don't think the Adox is.

 

[Milpool]

The bottom example does appear to me to have more distinct line detail - although it is difficult to know if the difference is due to edge effects versus overall contrast without knowing if the two films were developed to the same gradient.

In any case how would you get around the extremely poor uniformity / mottling problem inherent in these methods?

I compared FP4 type 517 cine film and Adox CHS100 II both developed in GSD10 1:20 45m 22C semi stand. Sharpened only by scanner on auto.





Looking round the edges of the images at full magnification it seems that CHS100 II shows more edge effects.
This one rather poor test is not conclusive but it might be of interest to see if the effect is visible in a field trial.

 

[Alan Johnson]

The bottom example does appear to me to have more distinct line detail - although it is difficult to know if the difference is due to edge effects versus overall contrast without knowing if the two films were developed to the same gradient.

In any case how would you get around the extremely poor uniformity / mottling problem inherent in these methods?

Agree. That's why I said "This one rather poor test is not conclusive"
A proper test with matched contrasts is a lab job. Nobody will do it in the forseeable future.

 

[FotoD]

Two forms of apparent sharpness with CHS100 II.

Mainly acutance effect within the emulsion (PC-512 Borax) and mainly adjacency effects in solution (GSD10 semi stand)

I've been struck by how evenly skies and other uniform areas develop with PC512. And there are no weird halos around edges.

For me the first image is far more pleasing than the second (tonality and evenness).

Which is sharper? I guess it's not that important to me.