Rangefinderfreak
Well-known
Is that Stefan B, my good friend ???
New film - Rollei RPX 25
- Thread starter tsiklonaut
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HHPhoto
Well-known
Yes, Mr Barth is now the head of the Maco Photo Division.
He represented the company on last Photokina, too.
Cheers, Jan
He represented the company on last Photokina, too.
Cheers, Jan
Rangefinderfreak
Well-known
hehe, I call him "Sir Balticum" (SB)he calls me: "Duke of HELL"... (Helsinki) DoH
shadowfox
Darkroom printing lives
swifty63
Fiat lux
I'm happy to see a new emulsion come out! I have a few rolls on the way for testing, looking forward to it.
Photo_Smith
Well-known
That's good because the size of the grain is not given by the developer type because that is a combination of the exposure and the developer time.
Developer types cause grain morphology, that is some developers change the physical shape of the grain giving an appearance of 'graininess' in the user when viewing at different print sizes.
Fine grain developer often promoted fillimentary growth that is the grains start out cubic and end up like this:
Grains don't clump together to form images either the grain centres have fixed positions:
Grain morphology creates tonal differences, and fine grain developers promote this.
Another myth is that sodium sulphite is responsible for fine grain in modern developers, it can help but isn't the main reason.
Sodium sulphite has a working action that is proportional to exposure, that is it attacks the less exposed grains allowing developer agents to access intersitial (interior) image and thus improves shadow detail. It has no effect on fully exposed grains.
Slow speed films are often single and only sometimes dual layer types so tonality is normally obtained using soft working developers.
Obviously then with grains in the range of sizes of a 25ISO film even Rodinal will not cause 'golf ball' size grain– no developer will be able to do that. Tonality will be a function of exposure and development time providing that the mix is either a soft working (probably metol) developer or a surface type like beutler or dilute Rodinal.
Athiril
Established
Noll
Well-known
Athiril - I'm not sure I can see much difference between your shots... they both look jpeg-ified and not resolving actual grain.
I have seen some of your other scans though, and they looked tremendous in terms of detail so you might have to spell this one out for us in germs of what you are observing.
I have seen some of your other scans though, and they looked tremendous in terms of detail so you might have to spell this one out for us in germs of what you are observing.
Photo_Smith
Well-known
I can't be sure but from my take adding sodium sulphite has a small effect on the perception of grain when added to Rodinal, most photographers are unaware that it already contains a small amount of sulphite in the form of Potassium Sulphite.
In Lab tests Agfa found that sulphite had a much smaller effect with Rodinal than with other developers, it's main reason for addition being preservative.
Finer grain will be achieved by adding sodium ascorbate in small amounts 2-5 g/l
There are many myths about Sulphite in developer some true and some false some partly true.
It is usually paired with developers using hydroquinone because sulphite ions block the oxidation of that developer substance during reduction and slowing the creation of benzoquinone which actually renders it ineffectual.
In some p-aminophenol and p-phylenediamine types prevent auto oxidation using other reagents stannous salts, ascorbic acid etc.
The action of sulphites is much misunderstood, often just 'they nibble the edges of grain' which is only partially true is given as their main reason for addition which is only a tiny part of what they do. They have less effect on Rodinal (although a small one) because its chemical make-up and are more effectual towards less saturated grains their effect being proportional and almost disappearing on a fully saturated grain.
Sulphite also promotes physical development though its mild solvent action, which is less attractive when using slow acting developers because of the possible isolation of silver nuclei from the silver halide, some studies finding partial reversal in extreme cases and in larger amounts can indeed disrupt image structure and affect acutance and in some cases influences the characteristic curve.
In Lab tests Agfa found that sulphite had a much smaller effect with Rodinal than with other developers, it's main reason for addition being preservative.
Finer grain will be achieved by adding sodium ascorbate in small amounts 2-5 g/l
There are many myths about Sulphite in developer some true and some false some partly true.
It is usually paired with developers using hydroquinone because sulphite ions block the oxidation of that developer substance during reduction and slowing the creation of benzoquinone which actually renders it ineffectual.
In some p-aminophenol and p-phylenediamine types prevent auto oxidation using other reagents stannous salts, ascorbic acid etc.
The action of sulphites is much misunderstood, often just 'they nibble the edges of grain' which is only partially true is given as their main reason for addition which is only a tiny part of what they do. They have less effect on Rodinal (although a small one) because its chemical make-up and are more effectual towards less saturated grains their effect being proportional and almost disappearing on a fully saturated grain.
Sulphite also promotes physical development though its mild solvent action, which is less attractive when using slow acting developers because of the possible isolation of silver nuclei from the silver halide, some studies finding partial reversal in extreme cases and in larger amounts can indeed disrupt image structure and affect acutance and in some cases influences the characteristic curve.
Athiril
Established
They're Flextight 949 scans crops, enlarged digitally to 200% so you see what's happening on a per pixel level easier.
To me, the 85g/L version looks slightly crisper, less soft appearing than the 100g/L litre, perhaps not much in terms of actual detail itself, but I prefer the 85g/L version.
85g/L vs 100g/L is only a small difference in sodium sulphite. Either one diluted 1:1 would have much less (as in half), and the difference would be larger.
This is also T-Max 100. So it's worlds finer to begin with than something of the same speed that's not T-grain, like FP4+ for example.
Faintandfuzzy
Well-known
Yay...more film to try
Spicy
Well-known
Any ideas on availability/pricing? ISO25 should be nice for wide open daylight stuff with my older cameras and their fairly lame maximum shutter speeds. Either way, more film is more film :-D
shortstop
Well-known
I'll try it in 135 and 120 at the moment
Antinio
Antinio
HHPhoto
Well-known
Macodirect is shipping worldwide:
http://www.macodirect.de/rollei-p-2982.html?language=en
Their distributors in Asia can be found here:
http://www.maco-photo.de/main.php?kat=334
Cheers, Jan
Pioneer
Veteran
RPX25 120 Film
RPX25 120 Film
Been putting this through my Ikoflex. So far it seems to respond similar to Efke 25 though the developing time is one minute longer.
I haven't really tried to do anything out of the ordinary with this yet. Exposure set at box speed using a Sekonic L208 Twinmate.
Developed with D-76 1+1 for 8 minutes at 20C. Continual rotation in a Jobo tank.
Scanned with Epson V500. Resized through Lightroom to e-mail size. No other processing or sharpening.
RPX25 120 Film
Been putting this through my Ikoflex. So far it seems to respond similar to Efke 25 though the developing time is one minute longer.
I haven't really tried to do anything out of the ordinary with this yet. Exposure set at box speed using a Sekonic L208 Twinmate.
Developed with D-76 1+1 for 8 minutes at 20C. Continual rotation in a Jobo tank.
Scanned with Epson V500. Resized through Lightroom to e-mail size. No other processing or sharpening.
Attachments
swifty63
Fiat lux
ooooh, looking good! liking the light on the fence in the first shot. i have five rolls just arrived from macodirect, with a packet of perceptol. looking forward to seeing how it works.
Pioneer
Veteran
So far I like it. I ordered this first batch from MacoDirect and it comes to about $10 per roll after shipping. Obviously there are other nice films I can shoot for less than that so I doubt I will buy a lot. Maybe the price will drop a little when it comes to US dealers.
Fotohuis
Well-known
The price in Holland will be close to EUR. 5,- incl. 21% VAT. But for an iso 25 film, which will be selling a lot less then iso 100/400 I do not think this will be any problem.
Pioneer
Veteran
That comes out to about $6.75 US without the tax. I can live with $6.50 to $7 USD but my last batch cost a couple cents less than $100 for 10 rolls shipped. Nice film though so I will probably continue shooting it anyway, but nowhere near as frequent as I shoot TMX100.
I noticed that my rolls had a blue green dye that comes out in the developing stage (or pre-wash if you do that kind of thing.) Not sure if there are any others that do that. The most recent rolls of Efke 25 I have used don't seem to have that dye.
Colin Corneau
Colin Corneau
Pioneer, for what it's worth I've noticed that strong blue/blue-green dye when I use Rodinal with other Rollei films, such as RPX 400 or Retro 100
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