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DaleHCook

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Jul 1, 2025
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Roanoke VA
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I have long used SLRs, and still own my most recent film SLR - a Pentax K-1000. My current camera is a Pentax K-70, purchased in 2018, with three prime lenses and two zooms. Two of my photographic interests are color photographs of old water-powered mills and covered bridges. The third interest is an outgrowth of my decades of genealogical research, and that is photographing old gravestones. Classic scholarly photographs of gravestones began with plate cameras in the late 1800s, and today are still monochrome, which displays important details of inscriptions and decorations much better than color. Scholarly gravestone photographs are taken when the sun is illuminating the face of the stone at a 20 to 30 degree angle to provide the best details.

Some of the techniques which I use with my K-70 are derived from my decades of film SLR photography. One is the use of a variety of colored filters to affect the way colors are rendered in monochrome. For example, if a stone is rendered as a fairly light gray I want it to contrast with the (generally green plants) background, so I use a red or orange filter to darken the chlorophyll. If a stone renders as a darker gray I may use a green filter to lighten the background.

Selecting the best filter to use for a monochrome filter is done with my "Filter Flip Book," which contains selections from a large sample book of theatrical lighting gels carefully selected to match the color characteristics of each of my filter.. Each gel selection is mounted in a frame labeled with the gel number and the corresponding filter number. The frames are loose-leafed together. Although theatrical gels are not good enough to be used in front of a lens for photographs, they are good enough to quickly select from multiple filters, and the flip book makes the process a lot faster than trying multiple screw-on filters on the lens.

Some of you will say "Just shoot color and do the filtering in post." I have two reasons why I don't do that:

1) I want to capture the correct image in-camera. In my film SLR days I would try on all of the filters that I thought might work, and bracket all the shots. That was relatively cheap to do because I bought Tri-X and Plus-X in bulk, and loaded my own cartridges. I had a very well-equipped darkroom, so I developed my own film, made contact sheets to select the optimum image, printed it with my Super Omega enlarger, and developed and dried it.

2) Because of my filter flip book and automatic bracketing I can get the correct image in-camera faster than trying to do color filtering in post.

Dale H. Cook, Pentax K-70, Pentax DA 35mm, Pentax-D FA Macro 100mm, Pentax DA 18-270mm; Mamiya/Sekor 400mm; Rokinon 650Z 650-1300mm
 

MattKing

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Welcome to Photrio.
 

mtnbkr

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Welcome!

I'm a former resident of Roanoke myself. I lived there in the late 80s through mid 90s. My wife and her family are from there as well.

I live in NoVA now and the area is full of old family cemeteries from the 1700s onward, so your comments about gravestone photography caught my attention.

Chris
 
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DaleHCook

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Jul 1, 2025
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Roanoke VA
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I live in NoVA now and the area is full of old family cemeteries from the 1700s onward, so your comments about gravestone photography caught my attention.

Chris -

Thank you. I have ancestral gravestones going back to the late 1600s in Massachusetts.

One aspect of gravestone photography which I am still working on is eliminating the need for sunlight illuminating the face of the stone at 20 to 30 degrees. That provides a window of only about 15 minutes per day to achieve optimum photographs. I am working on using flash photography when the face of the gravestone is not in sunlight.

Setting up a tripod with a boom to support a flash above the stone and illuminating it at the correct angle is child's play for an experienced photographer. What has prevented this approach from working successfully in the past is the inverse square law. The illumination at any point on a surface is the inverse of the square of the distance from that point to the light source.

Imagine a gravestone three feet tall. When illuminated by the sun the inverse square law shows that the difference in illumination between the top of the stone and its base is immeasurable as far as the camera is concerned.

Now imagine that same stone lit by a flash one foot above the top of the stone. If we use 1 foot as our reference distance the inverse of the square of 1 is 1 for illumination at the top of the stone.

One foot below the top of the stone is two feet below the flash, resulting in illumination at that point of 1/4 of that at the top of the stone. A point two feet below the top is 3 feet from the flash for of an illumination of 1/9 of that at the top. The base is four feet below the flash for an illumination of 1/16 of that at the top. A 16 to 1 illumination difference between the top and bottom of the stone is extremely noticeable in a photograph.

I am working on technology to try to produce illumination from the flash that is uniform from the top to the bottom of the stone.

Dale H. Cook, Pentax K-70, Pentax DA 35mm, Pentax-D FA Macro 100mm, Pentax DA 18-270mm; Mamiya/Sekor 400mm; Rokinon 650Z 650-1300mm
 

Sirius Glass

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Welcome to Photrio!

For years I used Minolta slrs.
 

koraks

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Welcome aboard @DaleHCook !

1) I want to capture the correct image in-camera. In my film SLR days I would try on all of the filters that I thought might work, and bracket all the shots. That was relatively cheap to do because I bought Tri-X and Plus-X in bulk, and loaded my own cartridges. I had a very well-equipped darkroom, so I developed my own film, made contact sheets to select the optimum image, printed it with my Super Omega enlarger, and developed and dried it.

2) Because of my filter flip book and automatic bracketing I can get the correct image in-camera faster than trying to do color filtering in post.
I understand your point, although I'd argue that (1) is not really a relevant consideration anymore if you capture digitally. As to (2), I would counter it by having far more flexibility in digital post production, and the matter of speed/productivity is really one that boils down to tool choice and proficiency. Trying a couple of different filters really takes no more than a few seconds in a typical RAW converter or photo editing tool - it takes less time than to reach for and open up the pocketbook of filters.
 
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