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AstroBobo
sage
Reged: 07/04/07
Posts: 395
Loc: Zagreb, Croatia
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Hello all,
A few days ago I found a 5-pack of Fuji Provia 400X in the camera store I usually buy films. The 400X is a new emulsion which replaced 400F. I was interested to see if the spectral response would still be good enough for h-alpha nebulas.
Two days ago the skies cleared so I had the opportity to test the film. My targets were comet Holmes and M42. I use a Pentax 6x7 medium format camera. Comet Holmes was captured wide field with a 150mm lens and M42 with my Pentax 105 SDP apo refractor.
Here's a crop of M42, 40-min exposure. Scanned with Epson V700 and a bit of curves adjustment after scanning. I'm quite pleased with the result. The grain is very fine (this photo is 25% of the original scanned size) and a lot of the nebula was captured. Unfortunately I did not manage to make a direct comparison with the older emulsion  but I'm very satisfied with the new one.
I still have some 15-20 rolls of 400F in my fridge though 
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Boris Stromar : AD Infinitum member : Zagreb, Croatia, Europe
P75SDHF : P105SDP : MN71 : CGE : STL-11000
http://www.astrobobo.net
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ZachK
professor emeritus
Reged: 08/21/05
Posts: 667
Loc: Israel
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Good to know, I still have some 400F in both 35mm and 120. Now if I could only get 400x in 4x5 (they don't make it)
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Zach Kessin
Yesha Israel
Meade ETX 127 Mak-Cass
15x70 Celestron Skymaster Binoculars
Sinar F 4x5 view camera
Rolliflex Camera 80mm F2.8
Pentax K-1000 Camera 35,50 and 60--300mm zoom
3 kids, Large cat, small dog
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ClownFish
Post Laureate
Reged: 04/26/05
Posts: 5600
Loc: Islamabad, Pakistan
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Looks good - if maybe a bit on the violet side. The blues really came out -0 you need to shoot M45 now! I think perhaps the 400X shifts the red compared to 400F. For a test, I think one of each of these will show the real effect of the emulsions.
1. REDS: M8 - Lagoon nebula
2. BLUES: M45 - Pleiades
3. YELLOWS: Area around Antares
CF
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Learn all about POLAR ALIGNMENT with my Drift Method Tutorial and simulator!! Or visit my Foreign Service Blog!
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AstroBobo
sage
Reged: 07/04/07
Posts: 395
Loc: Zagreb, Croatia
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Good suggestions, thanks Clownfish! Next time I'll try M45 nad perhaps I'll manage it with 400F for comparison.
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Boris Stromar : AD Infinitum member : Zagreb, Croatia, Europe
P75SDHF : P105SDP : MN71 : CGE : STL-11000
http://www.astrobobo.net
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Nightfly
super member
Reged: 06/20/07
Posts: 199
Loc: Sullivan, Maine
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Boris,
Very good. Perhaps 400X will become an optional film, especially where blue response is a consideration. I will be running a roll of 400X through on the next dark run. I would like to see your 150mm shot of Holmes.
Jim
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Jim Cormier
Sullivan, Maine, USA
www.nightfly.zoomshare.com
Pentax 67 with 55, 105, 165, and 300mm lenses
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AstroBobo
sage
Reged: 07/04/07
Posts: 395
Loc: Zagreb, Croatia
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of course, I'll post it as soon as I can
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Boris Stromar : AD Infinitum member : Zagreb, Croatia, Europe
P75SDHF : P105SDP : MN71 : CGE : STL-11000
http://www.astrobobo.net
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