On rare occasions I have really enjoyed using Adox CHS Art 25. The reciprocity is almost nothing. It becomes a "fast" film under pinhole applications. Same thing goes with the faster 50 and 100 ASA versions but then the quality degrades, and grainyness appears (in 100). The Adox CHS Art 25 has an undeterminable grain. You cannot tell there is a grain. If that's your desire, consider this film. You'll get a little darker skies too, which is a real bonus when there's clouds as it creates a very dynamic sky. You don't want to overexpose this film. It will blow out highlights. Somewhere I have information on calculating reciprocity with Adox. It does not work like the other films. If anyone's interested on that, sound the alarm and I'll try to dig up the details.