Images from photographyhacks.org

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I made a new page for the images from the website. They are in no particular order by name or type.

The Iris image is from the website.    

Catching Up

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NOTE POSTED 04-17-2009 – I have been trying to get a handle on the cross slit project since this was originally posted here. At this moment, and I don’t see my mind being changed, I am abandoning any further work or time. I believe that simply put, since there are two distinctly different focal lengths there will always be one plane that is stretched out of proportion. I am planning to continue into the world of old manual focus M42 lenses and even older lenses from folders on my Canon XTi. Of course, there will still be occasional side trips into pinhole land.

Original text starts here:
I did receive the SD card I needed in order to test my digital stereo rig. As soon as there is a decent day I will be trying it out, along with some more shots with the homemade wood stereo camera and, of course, the newest toy – that double slit camera cap. The main problem for the rest of the year is the weather. With an annual snowfall of over 110″ per year combined with one of the lowest percentages of available sun received, the subject matter until Spring is mainly bare trees and snow. In fact, guess what was in the air just a half hour ago ? 

 

Stereo Depth of Field Table

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I ran across this table today – related to be from the 50’s with no other reference given. By picking the nearest and farthest points you can figure out the best distance between the stereo lenses. By putting in the distance between the lenses, you can get the depth of field for your camera. I make no promise as to the usefulness or accuracy of this information. I am simply passing it along as a matter of possible interest.

The distance of		The STEREO BASE in MILIMETERS
the nearest object		15	30	65	125	250	500	1000
in METERS		Here are the maximum distances of the FARTHEST object in METERS
0.1		0.12	0.11
0.2		0.27	0.23	0.21
0.3		0.51	0.38	0.33	0.31
0.4		0.88	0.55	0.45	0.43	0.41
0.5		1.56	0.76	0.59	0.54	0.52	0.51
0.6		3.2	1	0.74	0.66	0.63	0.62	0.61
0.7		14	1.33	0.9	0.79	0.74	0.72	0.71
0.8		infinite	1.75	1.07	0.9	0.85	0.83	0.81
0.9			2.3	1.26	1.05	0.97	0.94	0.92
1			3.1	1.45	1.2	1.1	1.04	1.02
1.2			6.7	1.92	1.48	1.32	1.26	1.23
1.4			29	2.5	1.8	1.51	1.48	1.44
1.6			infinite	3.2	2.15	1.83	1.71	1.65
1.8				4.1	2.52	2.1	1.94	1.86
2				5.4	3	2.4	2.2	2.1
2.5				12	4.2	3.1	2.8	2.6
3				52	5.8	4.4	3.4	3.2
3.5				infinite	8	5	4	3.8
4					11	6	4.8	4.4
5					27	8.5	6	5.6
6					250	12	8	6.8
7					infinite	16	10	8
8						23	12	9.5
9						54	19	13
10						infinite	25	17
12.5							38	22
15							108	34
20							infinite	51
25								77
30								216
40								infinite
50

Digital Stereo Pinhole Project Finished

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The mechanical part of the project is finished. I just have to wait for an SD card to arrive and get the batteries re-charged. The weather is calling for rain for the next four days, so it appears that somewhere around October 1 I will get a chance to try the rig. The yellow object behind the cameras is a tape measure holding the rig up for the pics.

A construction story and related pictures for this stereo digital pinhole camera are posted on my website > http://photographyhacks.org <, a clickable link is in the Blotlist to the right >>>>>>>>>>>>

Also there is a short ‘how to’ on making pinholes. To make a pinhole cap for any camera with removable lenses, simply make a hole approximately 3/8″ in diameter in the dead center of a body cap. Then glue the pinhole to the inside of the cap, centering the pinhole, and paint as much of the metal flat black as possible without filling in the pinhole, this to cut down on reflections. Do not worry about the exact size of the pinhole for your first attempt. Just do it and enjoy the results.

Update 10-03-2008: I just put a stereo camera DOF – Depth Of Field – table from the 1950’s in a posting today.

Update March 2009: Like everything that seems simple, this project has come back to bite me. I was in such a hurry to get finished, that I never turned on the cameras to sight the placement of the pinholes relative to the sensor. In other words, it turned out cross-eyed, Now I will have to pop off the pinhole assembly and re-attach them more carefully. Oh well.

It is wonderful to be retired ..

 
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 .. and have the opportunity to just stop what you were doing and strike off on a different path without asking permission.

 This morning I was digging around in the rear of a drawer full of parts for projects that were never completed/started/remembered, looking for a 58mm lens cap. I found two K*odak E*asyshare C340 5MP digital cameras. Both had the same problem (I got them at an auction website as for repair only), the little shutter over the lens did not open when the lens assembly extended during power up. I had thought to glue them open and use them as cheap point and shoot backups. One showed my failed attempt, the shutter was glued open OK, but the lens had a blob of the glue dead center. 

Since I had thought quite a bit during the wood stereo pinhole project about those two Olympus XA2 35mm cameras and their future conversion to a coupled stereo film pair setup; the jump to a pinhole digital stereo pair setup was very easy. The lens cap search was put on the back burner and an immediate trip to the workshop followed.

The matched pinholes are constructed and the flat black paint is now drying in the workshop. I will post a construction how-to on my website  >> http://photopgraphyhacks.org  << when it is complete and images will be placed here.  There is a clickable link in the BlogSpots widget to the right >>>>>>>>>>

Update: I just posted a small article on my website regarding making matching pinholes for either a stereo pinhole camera or matched pinhole cameras.

Pinhole Day 2009

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According to the Pinhole Day website > www.pinholeday.org < each year Pinhole Day is on the last Sunday in April which will make it April 26, 2009.

Time to start planning ahead ! 

Quick synopsis of Pinhole Day – the day that all participants take image(s) and upload to the website. All uploads will then be put in a gallery. The Pinhole Day galleries for past years (2001-2008) are available for perusal. It is amazing to see the images from all over the world, taken with all sorts of cameras, all within the same 24 hour period.

Take time to look at the galleries for the past years. I make a bookmark of the last image I have looked at and then start in the same place when I again have the time.

I will put a clickable link within the Web list Widget to the right.

As soon as I get a few images sorted out, I will make some pages up to hold them, after all, I am trying to have a PhotoBlog here. LOL

Edit/Update at 9:30PM – I added a page with some of the images from the stereo pinhole camera.

It is a dark and dreary day ……….

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Perhaps I will see what develops ……….  Enough of that ! 

I do have a personal website, nothing for sale and no opinions on current affairs.

Update March 2009: The website below is now being forwarded to this website. All information is on a page named photographyhacks.

There is an article with details on the Yashica A conversion to pinhole, another on those screw on wide angle adapters, and more photographs.

Today I am going to attempt working with the stereo pairs I have from my homemade pinhole stereo camera. I will probably do one in P***oshop and another in a freeware stereo program. When I get done, if either are decent, I will post them in a message here. They will be in both stereo pairs for crosseyed viewing and in anaglyph format for use with red/cyan glasses.

I just found that the NYC metro system has a 1 day pass for $7.50, available at automatic dispensers. Compared to the double decker bus day pass it is a bargain. I believe I will get one first thing. A note to remember for newbies on the NYC Subway system- in less traveled areas of Manhattan (possibly other places also) there are entrances that only go in one direction. With my last fare used on my card, I went through the turnstile and got in an uptown terminal – yup – I wanted downtown. So, back through the turnstile, up the stairs, across the street, back down, purchase another fare ticket and get on the correct train.  Like I have said in an earlier posting here, I am but a country bumpkin.

Film marathon completed

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I started at 6:30pm and finished at 12:10am – 10 rolls. For sure, I am considering either a few more single tanks or one of those biggies that takes 4 120 films at a time. This was too long to spend standing on a concrete floor.

The one from the Bronica looks very good. The pinhole rolls will have to wait on the scanner for judgement. I did see that there are no apparent leaks in the stereo pinhole, that is good news and it will nudge me to finish up the little extras that need to be done on it.  

One failure to report tho, I tried one of those stainless steel tank/reel combos and ruined one roll when the film obviously slipped out of the grooves and the chemicals didn’t reach most of the film. I did notice something, the Lucky and Shanghai brand films do not have the nice little oval opening that catches on the stainless reel’s tab as does Kodak. This made it very frustrating to get the end to stay put in the reel. The lack of the opening possibly caused the failure. The Chinese film goes in the plastic from now on.

A test roll through the stereo pinhole

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Today we had a lot of running around so all I accomplished was a test roll through the stereo pinhole camera.

I took exposures in the full Sun of 18,24 and 30 seconds and then a five minute in the sun to check for leaks. Yet another roll of film in the bag. I saw a blurb on a Chinese blog about the film I am using being prone to dye transfer from the paper backing to the negative. This was being blamed on long storage (6mos) before developing exposed film. Something to think about and watch for. I keep my film in a freezer at -10F and only remove it to shoot, I wonder if that has any bearing.

Quick update

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We spent the last week in New Hampshire at relatives. I managed to take 4 rolls of 120 B&W with the homemade wooden pinhole camera in a cemetery that dates back to the early 1800’s. Hurricane Ike was raising havoc with the weather and the highest lux reading I could get was ~3000 when I pointed directly at where the Sun appeared to be. The exposures were up in the three minute range, I hope I correctly factored the exposure. When I get the chance, I will develop them and if I get anything worthwhile, I’ll post them here. Also, we went to the NASCAR Winston Cup Race at Louden. That day was extremely wet and overcast. I took about six pictures with my pocket digital, I haven’t had a chance to look at them either.

Before we left, I finished the pressure plate on my pinhole stereo project. I believe all the glues and paint have had enough time to cure and I look forward to doing a couple test rolls in it. First thing will be to leave it with everything closed up in good light with film in it to check for leaks.