You may recall me recently mentioning the book "Image Clarity:
High-Resolution Photography" by John B. Williams. He talks at length of
"point-spreading" and point-spread functions and that the system
point-spread function is the sum of all the component point-spread
functions. Film halation is just one of many component point-spread
functions.
Chuck Norcutt
On 9/28/2011 10:29 AM, Ken Norton wrote:
>> Does this go by another name today? Kodak's web site does not list any
>> film named Tri-Pan-X.
>
> I'm assuming he meant "Tri-X" which happens to be a panochromatic
> film. In otherwords, not an orthographic film. Unfortunately, it's not
> really what I would consider to be a high-resolution film. The grain
> does respond well to manipulation via developer, though, and will give
> excellent edge-detail.
>
>> The highest resolution B&W professional film
>> listed there is Kodak Professional T-MAX 100. Very good resolution
>> (looks to be about 125 lines/mm at 50% contrast) but it would likely
>> require studio conditions and massive camera support to take advantage
>> of it.
>
> I personally prefer Ilford Delta 100 over T-Max 100 due to the way it
> handles highlights and the extended toe and shoulder. What may seem
> odd to some is that Delta 100 resolves better than Pan-F, but the
> tonalities are quite different.
>
>
>> Of course, with film you also have the option of (cheaply) going to
>> larger formats. You could use the more pedestrian T-MAX 400 (closer to
>> 35mm size digital in resolution) and still beat 35mm digital on total
>> image detail using 2-1/4 or larger... assuming you're not shooting at
>> f/64. :-)
>
> Tri-X in 4x5 is glorious stuff. However, it's not about resolution,
> but tonal gradients. Pan-F in medium-format is a marriage made in
> heaven. For the B&W landscape photographer, that is one of the best
> combinations ever.
>
> Resolving ability? Many of you will remember a photograph from a few
> years ago of this old abandoned farm house on a hillside. The 35mm
> verson on HP5 shows these stain marks on the wood where the nails are.
> The 4x5 on Delta 100 version reveals the rust pattern on the nails
> themselves. And that was from a poor Kodak lens on the Crown Graphic.
>
> The discussion of diffraction limits is pretty fascinating. I will
> admit that I run up against the diffraction limits on FILM, but not so
> much on DIGITAL. It seems that the diffraction limits are partially
> obscurred by the AA filter and even at that, the same type of
> sharpening used to counter the AA filter is also useful in providing
> enough false resolution in countering the lens diffraction. But the
> other problem I run across with film, which is a total non-issue with
> digital is halation blurring. This look a lot like diffraction, but
> occurs where colors or highlights will bleed into neighboring dark
> areas. As mentioned before, Fujichrome Provia 100F is simply aweful
> when it comes to halation blurring. Another film I have always
> struggled with in this regard is Ilford HP5.
>
> AG
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