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#1
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HP5+ vs Tri-X when pushing
hi,
i want to know which one is better when pushing? and which one is faster ( in real ASA )? p.s. suppoes D-76 devloper will be used. thanks. - woody |
#2
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HP5+ vs Tri-X when pushing
In article . com,
Steven Woody wrote: i want to know which one is better when pushing? and which one is faster ( in real ASA )? The real "ASA" is the one printed on the box. Pushing only increases the slope of the curve, i.e. it ups the contrast. |
#3
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HP5+ vs Tri-X when pushing
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#4
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HP5+ vs Tri-X when pushing
In article . com,
"Steven Woody" wrote: i want to know which one is better when pushing? and which one is faster ( in real ASA )? p.s. suppoes D-76 devloper will be used. The two emulsions are different; neither is "better". HP5 is more contrasty than TriX out of the box so it will push contrastier. TriX's grain structure hasn't changed much over the decades so the larger grain shouldn't seem as intrusive as HP5's. Since HP5 has more of a "T" style grain, when pushed it resembles (IMHO) high-speed color neg grain. If you are after contrast HC-110 or equivalent might be a better choice than D-76. D-76 is pretty neutral and very kind to midtones. But processing method also plays a role. D-76 in a small tank will yield different results than dip-n-dunk with nitrogen burst agitation. Speed, like contrast and grain is relative and subjective. Some people regularly pull 400 to 200 for a wider latitude. Some people push 400 to 800 or 1600 for available light or monster grain. Remember the first rule of photography: "Light interacts with silver salts; all else is negotiable." Hope this helps, Jon |
#5
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HP5+ vs Tri-X when pushing
In article . com,
Steven Woody wrote: by real 'asa', i mean the film speed acording to human experience when use a film in practice. That would be EI. ASA (now ISO) has a strict definition. pushing increases the overall contrast by means of move most lower value zones to high value zones, hence increases brightness. The lower zones don't change much at all with longer processing (other than increasing fog base). All you do it increase contrast. that's kinda of human feeling of 'speed'. No, it isn't. please answer the queston directly. thanks. Please do some tests and answer it for yourself. |
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