@Arcadia4
I'm pretty certain that the 'new' APX films are Kentmere or close variant thereof - .
Yes, there is a consensus by those who have tested the current APX films correctly (sensitometric tests = characteristic curve, resolution, sharpness and grain tests). And who have also tested them the same way in comparison to these films which could be similar or identical.
I have done these tests, other photographers I have talked to as well. And you will also find such test results here on photrio.
The current AgfaPhoto APX films are from the Kentmere production, therefore identical to Kentmere 100 and 400. Rollei RPX 100 and 400 are also rebranded Kentmere 100 / 400 films.
The above 2 quotes would appear to summarise the "Who makes AgfaPhoto APX 400? question and I gave no more thought to it until yesterday when I saw Greg Davis' video on the APX 400 film. I then recalled that earlier, in fact some 18 months earlier, he had done a video on Kentmere 400 so looked at that again. Just to set the scene for those who haven't seen his film comparison videos, he compares spectral sensitivity and H&D chart of each film with Tri-X as the comparison so there is no direct comparison between RPX 400 and Kentmere 400nm
It certainly looked as if the spectral sensitivity using his chart was the same but his 2 charts on the H&D charts were noticeably different to my eye. He then compares grain and as far as I could make out, the differences between APX 400 and Kentmere were very marginal
So in summary my conclusion was that the only noticeable differences were between the two H&D charts
So my question is: Could the inherent latitude in measurement accuracy and readings from measurements that are involved result in such differences which leads towards the two films being exactly or as near as makes no difference, the same or would the two films result in negatives that are different enough to make either film exhibit different characteristic in the shadow, mid-tones and highlight rendering that makes it worthwhile for the user to use price differences as the sole determinant of choice to the extent. In other words it would be a fair response to say that for all intents and purposes the user may as well base choice on price when next asked the question of which film should I buy?
For those interested enough to want to look and discuss I have linked to the two videos
Thanks
pentaxuser