High speed film for 4x5

[xkaes]

If you REALLY want to push your film with pre-sensitization, try hydrazine dyhydrochloride. It's basically rocket fuel.

[Mark Sampson]

Gas-hypering sure seems like 'photography made difficult'. Probably best to use TMX, TMY, or Acros and see what happens. A good starting point anyway.
I recall not being able to get good (printable) star trail images in the '80s with Vericolor type L film and an f/8 lens. When I used Tri-X, sometimes I got good results. Things are easier now.

[Pere Casals]

I'm building my gas-hypering chamber...

It can be done with a plain piece of steel pipe and a quality high vaccum pump. If vacuum is not very good then one can make more cycles of vacuum + filling with forming gas.

http://www.astropix.com/html/i_astro.../hypering.html

There is plenty of information from astronomers !!! thanks to them !!!

Hypering is a funny adventure... with Acros there is no need about it, but LF Acros is to disappear .


I disagree that TMY is close to Acros for that...


We have to remember that shadows have much more LIRF than highlights, so the edge Acros has it is very important to conserve shadow detail, very soon it delivers some 3 stops advantage over TMY in the shadows.


TMY is very, very far from Acros performance... but this depends a bit on the exposure time, and scene shadow depth...

[Leigh]

We have to remember that shadows have much more LIRF than highlights, so the edge Acros has it is very important to conserve shadow detail, very soon it delivers some 3 stops advantage over TMY in the shadows...

In astrophotography there are no shadows. Black is BLACK.

- Leigh

[xkaes]

[Pere Casals]

In astrophotography there are no shadows. Black is BLACK.

- Leigh

Of course... but OP says "photography at night", so I understand it will be salt flats landscape with star trails, this may have shadows...

[Rich14]

Here's a gorgeous example of Acros at night in a 2 min exposure.

Be sure to click to enlarge the image to full size!

https://www.flickr.com/photos/shawnh...7632303105515/

There are many other examples of LF B&W night images on the site. As well as other excellent 4x5 street photography.

Here's another "long" Acros night image.

https://www.flickr.com/photos/shawnh...7628339672271/

Rich

[Jim Andrada]

The big Tokyo stores still show Acros as available with no limit on quantity in 4 x 5, 8 x 10, 120, and 35mm. I think it should be available for a while yet.

[xkaes]

[jesse1996]

That is exactly what I'm going for with my photos o this trip xkaes! I'm planning on taking a coupe in Monument valley as well as out i the salt flats with the mountains occurring the lower 1/3 or 2/3 of the photo. what film did you use to capture the first image?