Harman Direct Positive Images

[SMBooth]

Burnt Snowgum and Wallace Hut. 5x7 pinhole 80mm. No preflash

[John Olsen]

[QUOTE=SMBooth;1373846]Burnt Snowgum and Wallace Hut. 5x7 pinhole 80mm. No preflash

Intriguing. The wide angle look really centers attention.

[John Olsen]

I went back to the Ebey's Landing steps on an overcast morning for another try with the pinhole camera. This one is a 16 minute exposure on preflashed Harman paper.

[SMBooth]

I went back to the Ebey's Landing steps on an overcast morning for another try with the pinhole camera. This one is a 16 minute exposure on preflashed Harman paper.

Do you have any idea how long the pre flash lasts?

[locutus]

Has anyone experimented doing preflashes using a Whitebalance lenscap?

This kind:

They should provide a uniform diffused exposure, that way one could do a preflash in the field before taking the main picture.

[Randy]

Has anyone experimented doing preflashes using a Whitebalance lenscap? They should provide a uniform diffused exposure, that way one could do a preflash in the field before taking the main picture.

Looks like a good idea. I have read suggestions of carrying a piece of plain matte board with you, like an 8X10" section, and hold it a few inches in front of the lens to preflash. Another possible option that I have not tried - if your lens has a small enough diameter, slip a white Styrofoam cup over it for preflashing.

[MAubrey]

Has anyone experimented doing preflashes using a Whitebalance lenscap?

This kind:

They should provide a uniform diffused exposure, that way one could do a preflash in the field before taking the main picture.

That's more or less what I do. I have tracing paper tapped to the glass of a cheap protective filter. It works well.

[locutus]

Do you have any rule of thumb for in camera preflash?

My guess would be to start with some rule like 'preflash with diffuser for 1/3rd of the metered exposure' obviously one would have to bench that against the actual light transmittance of the filter etc.

[Randy]

Also contributing to the contrast of the paper neg is developer and developer dilution, age (fog) of paper, whether or not the taking lens is coated. I recently read that a good starting point for paper neg in camera flashing is 1 2/3rd stop under shooting exposure. So, I guess if the exposure time for proper exposure is 10 seconds, pre-flash would be for about 3 seconds...? Or if exposure aperture is f/11, close down 1 2/3rd stops, to almost f/22. I have to do some experimenting myself.

[R.K]

Yes I did. Nice uniform preflash. Also can be used in Zone system film testing.