I am curious...

[baachitraka]

to know what film he might have used.

http://www.sashawolf.com/guido_castagnoli.html

 

[removed account4]

i could say " it looks like ... and processed like ... "
but why not go to the source ?


he has contact information on HIS website
why don't you email him directly and ask ?
good luck !
john

 

[andrel23]

Ever thought of a use of a light yellow filter?

 

[perkeleellinen]

It says he shot 10x8 colour, that must narrow things down I think.

 

[removed account4]

they could be chromes as well ...

 

[Diapositivo]

Look like negative film with poor filtering to me. The last image is the only decently filtered one (maybe a touch of yellow in excess as it appears here). A slide, any slide, would ordinarily not produce so wrong sky colours, unless there are some factors at work such as cross-processing, expired film, expired chemistry, long time elapsed between capture and development.