Bob, thank you for the link; I have started to read the whole tutorial. Under the heading "Properties of Sharpness" "Sharpness also depends on other factors which influence our perception of resolution and acutance. Image noise (or film grain) is usually detrimental to an image, however small amounts can actually increase the appearance of sharpness." I have also read Barry Thornton book "Edge of Darkness" that included examples of the above. His book is sometimes available on Amazon.com Developer type and film choice are critical in the sharpness relationship. High solvent effect developers which usually contain sodium sulfide 100gr. /liter or other solvents can exhibit poor sharpness, and when fine grain film is developed with these developers sharpness appears to be reduced further. Grant Haist wrote in detail about High-definition Developers. "Modern Photographic Processing" "fine-grain development and high-sharpness development are not possible with the same solution. This is a big subject, and my typing skills don't lend to the transcribing of all that he wrote about. Jonathan -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of BOB KISS Sent: Thursday, May 29, 2008 5:56 AM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: 35 MM T-MAX 100 IN PYROCAT? DEAR JONATHAN, Here are some definitions (curious choice of words!) of acutance. 1) "A measure of the sharpness with which a film can reproduce the edge of an object" (Dictionary.com) 2) The measure of lens performance or of picture quality, in terms of the sharpness of the transition across the boundary between the images of light and dark areas. (Photographic Optics; Cox) I have much more sophisticated definitions in Neblette and Mees & James but the above cover it. ******For an excellent example please see the following link. http://www.cambridgeincolour.com/tutorials/sharpness.htm Scroll down (about mid page) to the close up images of the man's sweater. The images clearly show the difference between resolution (ability to reproduce fine detail) and acutance (perceived sharpness, often due to edge effects). Soooooooooooooo, as mentioned, although the T-max 100 35mm negs I have processed with other developers held lots of fine detail, there was an overall lack of sharpness. CHEERS! BOB -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of mail1 Sent: Wednesday, May 28, 2008 7:34 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: 35 MM T-MAX 100 IN PYROCAT? Bob, In what context are you using the word soft? Jonathan -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of BOB KISS Sent: Wednesday, May 28, 2008 2:56 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: 35 MM T-MAX 100 IN PYROCAT? DEAR HTH, Did the T-max 100 in Pyrocat at least have good acutance? Or HD (high definition) as Sandy calls it? Though it seems there is often a trade off between grain and acutance, can you recommend a high acutance developer that doesn't produce too much grain with T-max 100? I find that, with my Leica and Leitz lens that perform VERY well with other film/developer combinations, though 35 mm T-max 100 is fine grain and yields fine detail it simply looks soft. CHEERS! BOB -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of J Howe Sent: Wednesday, May 28, 2008 5:46 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: 35 MM T-MAX 100 IN PYROCAT? 1:1:100, 15 min. 72deg. F in a 16 or 32 oz.SS tank. This printed well on VC paper with a #2 MG filter so all further were using this time, temp., dil. ISO 100. Agitation for all was 30 sec. initial, 10 sec. every 2 min. thereafter. Good negs but grainier than others and no other benefit. I thought I remember reading that Mr. King developed this formula for negs that could be printed in either silver or pt./pd. Again TMX 100 (the old stuff) 135 & 120 HTH BOB KISS wrote: > DEAR LIST, > Has anyone developed 35 mm T-max 100 film in Pyrocat HD? Please > suggest starting times, temps, and effective speeds. Please also let me > know what you thought of the results; grain, tonal separation, sharpness? > CHEERS! > BOB > > Please check my website: http://www.bobkiss.com/ > > "Live as if you are going to die tomorrow. Learn as if you are going to > live forever". Mahatma Gandhi > > > ============================================================================ ================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there. __________ NOD32 3141 (20080528) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com ============================================================================ ================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there. 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