Long Exposure Velvia 50 color shift

[Rust Never Sleeps]

So I was shooting a mountain scene in the High Uintas in north eastern Utah with rocks and rock slabs in the foreground with forest and peaks in the background. Was facing directly east and the lighting was post sunset as I needed a balanced exposure with the whole scene evenly illuminated.

Once the last rays of sun were off the peaks I got ready to shoot. Lens was a Grandagon 90 6.8 with a Heliopan KR3 MC filter. Exposures were F32 at 5s, 15s, 33s, and 66s for the four sheets I exposed as the light got darker with Velvia 50. When I got the film back I noticed a color shift that got worse as the exposures got longer. The 4s shot looks natural, with the 15S shot getting some color shift and the 66s shot the worse of them all.

Shift is magenta, violet, slight red, and some purple. Looks interesting and kind of other worldly in a way but I will print the first exposure. Is this color shift from the film or from what is all the blue light at this elevation(about 10,000 feet) on a clear day after the sun set, hence the KR3 filter or a combination from both.

I still have some Provia 100F, Velvia 100, and Astia 100F so I will try those in these conditions. If one of these does good I guess I am stuck using Velvia 50 <5 sec and one of the other films >5 sec. Thoughts, Thanks

[PViapiano]

Here's the spec sheet, and it does caution color shift in the film at exposures 4 sec and over (see item 5 of the pdf)...use the appropriate filters.

[Sevo]

Use Astia - it has reciprocity characteristics superior even to old Tungsten type slide film. No exposure compensation needed up to a minute, no filters needed for up to four.

[PViapiano]

I guess I forgot to put the link in there:

http://www.fujifilmusa.com/shared/bi...elvia50PIB.pdf

[Nathan Potter]

Sounds like you suffered a combination of two failures - reciprocity as mentioned but also color balance shift from non ideal incident light. I've had some real strange color shifts with Velvia near dusk from excessive blue sky illumination. I now tend to use Astia for lighting conditions that depart materially from about 6500K.

Nate Potter, Austin TX.

[ljsegil]

But has anyone found a decent source to purchase Astia in 8x10?????
ljs

[John Brady]

But has anyone found a decent source to purchase Astia in 8x10?????
ljs

Or a source at all. I have been unable to purchase Astia 8x10 for quite some time.
As far as I know it has been discontinued.

If anyone knows of a source I would love to know.

[Sevo]

Japanexposures has it listed. Hard to tell whether and when they can deliver - but they can provide Astia 4x5 QL within a week or so.

[Drew Wiley]

A warming filter helps, but Velvia simply behaves this way. Looking for 8X10 Astia 100F
myself (down to one box).

[ljsegil]

Yes, it is listed, but for $183! Time to look at some more data sheets and see if anything approaches Astia's reciprocity characteristics.
Larry