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Focus stacking misused
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Guido



Joined: 08 Jun 2011
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PostPosted: Wed Feb 24, 2016 7:23 am    Post subject: Focus stacking misused Reply with quote

Focus stacking works for other subjects to Wink

20 images


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Olympusman



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PostPosted: Wed Feb 24, 2016 9:27 am    Post subject: Focus stacking Reply with quote

One of the most remarkable stacked image I have ever seen was a lightning storm. The photographer lived on a hill above a city and stacked about twenty or so lightning strikes into one image.

Mike
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Pau
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PostPosted: Wed Feb 24, 2016 9:40 am    Post subject: Reply with quote

Image stacking for sure, but is there any actual focus variation between frames?. If not, it will be better qualified as multiple exposure.
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Guido



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PostPosted: Wed Feb 24, 2016 10:55 am    Post subject: Reply with quote

Pau wrote:
Image stacking for sure, but is there any actual focus variation between frames?. If not, it will be better qualified as multiple exposure.


Think it's none of both!
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Olympusman



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PostPosted: Wed Feb 24, 2016 3:21 pm    Post subject: Image stacking? Reply with quote

Just the same, image stacking software allows us to produce images unknown beforehand. HDR (which is wildly abused and end up looking like velvet paintings) can also be applied to photomicroscopy. I don't know how many of us are old timers and remember water-bath development of black and white silver film for extended contrast ranges.

Mike
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JW



Joined: 23 Feb 2011
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Location: New Haven, CT, USA

PostPosted: Wed Feb 24, 2016 3:24 pm    Post subject: Re: Image stacking? Reply with quote

Olympusman wrote:
I don't know how many of us are old timers and remember water-bath development of black and white silver film for extended contrast ranges.

Mike


Ah, the old push-pull with TMX100, I used to underexpose and overdevelop to increase contrast (guess I qualify as an oldtimer Rolling Eyes )
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Chris S.
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PostPosted: Wed Feb 24, 2016 4:21 pm    Post subject: Re: Image stacking? Reply with quote

JW wrote:
Ah, the old push-pull with TMX100, I used to underexpose and overdevelop to increase contrast (guess I qualify as an oldtimer Rolling Eyes)

That new-fangled T-Max stuff, eh? Didn't hold a candle to Pan-X, Plus-X, and Tri-X. (Old-timer--who, me?)

--Chris
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ChrisR
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PostPosted: Wed Feb 24, 2016 4:22 pm    Post subject: Reply with quote

If you got the wrong proportions of metol, phenidone and hydroquinone, you could have played around with Farmer's and a potassium dichromate/hydrochloric acid bath. With Plus-X and Pan-X anyway.. Couldn't afford TMax!
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ChrisR
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PostPosted: Wed Feb 24, 2016 4:28 pm    Post subject: Reply with quote

Very Happy
Glass plates and collodion, anyone?
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Chris S.
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PostPosted: Wed Feb 24, 2016 9:31 pm    Post subject: Reply with quote

Collodion? I used to dream of collodion whilst fuming silver plates in mercury. And carrying the camera obscura uphill both ways, in deep snow, barefoot to save shoe leather. . . . Rolling Eyes
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Guido



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PostPosted: Thu Feb 25, 2016 2:00 am    Post subject: Reply with quote

I had my first SLR in 1975, a Pentax Spotmatic F with a takumar 50/1,4.
I used Pentax BW film, later Kodak. As HP5 came on the market it was my favorit for years. I shot pictures for newspapers and needed strong contrasty pictures. HP5 was ideal. Could easily push it up to 3200 ASA (iso)
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Olympusman



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PostPosted: Thu Feb 25, 2016 8:33 am    Post subject: Developing techniques Reply with quote

The newer emulsions were too thin to hold much developer for water bath development, so the technique kind of went by the way side. As for me, I overexpose B&W film a full stop and underdevelop 30% -- good exposure range and the highlights don't block up. I also agitate very little. Presoak, continuous tank inversion for the first thirty seconds, then one inversion every thirty seconds for the next 2.5 minutes, and then one inversion a minute for the remainder. Beautiful negatives.
I almost exclusively use D-23 film developer.

Mike
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ChrisR
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PostPosted: Thu Feb 25, 2016 9:52 am    Post subject: Reply with quote

I settled on Acutol. Unsharp Mask in a bottle Smile
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Olympusman



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PostPosted: Thu Feb 25, 2016 2:23 pm    Post subject: Acutol Reply with quote

I have some Pyrogallic Acid and have tinkered with some of the staining developers, but geez they're a lot of work.
And on the topic of classic B&W films -- Verichrome Pan.

Mike
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Olympusman



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PostPosted: Thu Feb 25, 2016 2:36 pm    Post subject: Acutol Reply with quote

Looked up the Acutol formula and I think I'll give it a try this summer with the 8X10 view camera. I see the magic ingredient Phenidone (of which I have slightly less than three pounds -- long story). Phenidone was the other ingredient in the POTA developer (the other being Sodium sulfite) which yielded a 20-stop range for photographing atom bomb tests back in the 40s and 50s. Strange negative requiring the highest polycontrast filters to get a decent image, but what a range.

Mike
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