Topic: TLR pinhole results

[gsgary]

I explained in the other thread i messed up developement only put 300ml in my patterson because i have only been shooting 35mm for the last 6 months
The first shot the bellows were tight back to the body, exposure for 1 minute which gave me chance to go and sit on my bike for about 10 seconds, i think the tripod my have moved slightly because it was windy and i didnt have the legs fully extended so tomorrow, legs fully extended with a weight and 500ml of developer



And this one i moved closer and extended the bellows (not fully) i think exposure was the same

[Francois]

Exposure and optimal pinhole size change when you extend the bellows.

[gsgary]

The aperture on the shutter goes up to F45 I was wondering whether to try using just the shutter for a few shots and see what happens

[Indofunk]

Concept to execution in 24 hours! Impressive!

[Francois]

The aperture on the shutter goes up to F45 I was wondering whether to try using just the shutter for a few shots and see what happens

You're just going to get blur from that.
The aperture required to get a proper image should hover at around f/150....

[gsgary]

All I did was spray tac some cooking foil between 2 washers and made the hole with a needle, I'll try again tomorrow if I get time

[gsgary]

Concept to execution in 24 hours! Impressive!

Cheers but results were not great

[Francois]

All I did was spray tac some cooking foil between 2 washers and made the hole with a needle, I'll try again tomorrow if I get time

One of the best things for pinhole making is aluminum cans. If you just poke it so that it makes a dimple and sand it until it opens-up, you can make a surprisingly small and round hole.

[Ezzie]

I've done that, 600 grit works fine. 1200 even better. I then scan it at 2540 dpi and inspect it for irregularities. And of course measure the diameter by counting pixels. 30 pixels equals 0.3mm for instance.

[gsgary]

I've done that, 600 grit works fine. 1200 even better. I then scan it at 2540 dpi and inspect it for irregularities. And of course measure the diameter by counting pixels. 30 pixels equals 0.3mm for instance.

I can't be going to all that trouble can't I just guess

[Pete_R]

The aperture on the shutter goes up to F45 I was wondering whether to try using just the shutter for a few shots and see what happens

It's only 'f/45' with the 135mm lens (remember f numbers are related to focal length as well as aperture size). Actual aperture size would be about 3mm which is huge for a pinhole. As Francois said, you'll just get a blur.

A question (maybe a stupid one), did you remove the lens elements from behind the shutter as well as those in front?

[gsgary]

The aperture on the shutter goes up to F45 I was wondering whether to try using just the shutter for a few shots and see what happens

It's only 'f/45' with the 135mm lens (remember f numbers are related to focal length as well as aperture size). Actual aperture size would be about 3mm which is huge for a pinhole. As Francois said, you'll just get a blur.

A question (maybe a stupid one), did you remove the lens elements from behind the shutter as well as those in front?

Yes it was removed

[Ezzie]

You need a pinhole of 0.400mm or so. Maybe a tad larger. 0.400 will give you an f-stop of 300, give or take Ideal for a pinhole.

[gsgary]

You need a pinhole of 0.400mm or so. Maybe a tad larger. 0.400 will give you an f-stop of 300, give or take Ideal for a pinhole.

I used a pin so it must be right

[Francois]

It depends if you poke the pin completely through or if you just use it to make a dimple.
Pins can be surprisingly big when it comes to pinholes.

When I make mine out of an aluminum can, I use a sharpening stone to file down the edges.
Otherwise, I have some super small drill bits that I use when I can get away with a bigger hole.

[gsgary]

I went out in the woods with the dogs and the TLR pinhole, I found a 20+ year old roll of Tmax 400 and I'm quite excited after hanging the negs because exposure was total guess work will post some tomorrow