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kevin klein
12-17-2007, 10:38 AM
Here are a few prints from the home made emulsion.
I usualy have some small blotches or spots on the negative,probably dust flying around in the dark room whith the dehumidifyer going.

Some blemishes are round blury spots one of wich can be seen to the right of the smoke stack on the steam engine picture.

Photo Engineer
12-17-2007, 10:39 AM
Yeah, coating defects. I've seen those.

Very nice, congratulations. What was the ISO, can you tell us?

PE

Kirk Keyes
12-17-2007, 11:54 AM
Kevin - good work. I love the little guy next to the steam engine!

kevin klein
12-17-2007, 12:19 PM
ISO is about 3.
I tried to find a suitable picture in a book or other photos to use for the guy by the engine with no luck, so I used one of my studio test exposures from a couple of years ago. Just print to size,cut out,glue on a stick and place in hole next to subject.

What can cause the defects and what would be the cure other than an imperfectly clean plate?

Photo Engineer
12-17-2007, 12:47 PM
Did you filter the emulsion?

Using a stainless steel (gold mesh) coffee filter will do wonders for defects.

PE

Sirius Glass
12-17-2007, 03:09 PM
Did you filter the emulsion?

Using a stainless steel (gold mesh) coffee filter will do wonders for defects.

PE

Cure them or cause them? ;)

Steve

Michel Hardy-Vallée
12-17-2007, 03:18 PM
Very nice, I think I actually like the defects in the emulsion!

Kirk Keyes
12-17-2007, 05:39 PM
Cure them or cause them? ;)

Steve

He means "cures" them.

Something similar to this is what PE is suggesting:
http://www.bedbathandbeyond.com/product.asp?order_num=-1&SKU=12198515

Filter the melted emulsion right before coating the paper or plates. It removes any bits of crud, solidified gelatin, or silver halide particulate that will make little blotches on the finished product.

Photo Engineer
12-17-2007, 06:01 PM
Just make sure it doesn't contain any brass, bronze or copper. Then it won't cure them, it may cause them. Iron may also cause spots.

PE

kevin klein
12-18-2007, 11:26 AM
I used muslin cloth for filter material, maybe that is letting out small fibres and may not be compleatly clean since I reuse the cloth each time,I clean it out with hot water after use.

Photo Engineer
12-18-2007, 12:03 PM
Well, I've used muslin and it seemed ok. I've also washed it with no apparent problem. But, I've found that the muslin pore is larger than many foreign objects, so the coffee filter appears to have performed better for me.

PE

athanasius80
12-19-2007, 01:11 AM
I love it! Thanks for posting those examples.

Dark Orange
12-25-2007, 01:51 AM
Get yourself some blocks of perspex, a few hand tools and some bits and pieces and build one of these:

http://farm3.static.flickr.com/2170/2134350161_aa71efaf92_t.jpg (http://www.flickr.com/photos/dark_orange/2134350161/)

;)