jim_richey

A single lens coating only covers a narrow frequency of light. A lens with a single coating may match a multi-coated lens with certain colors, but not others. If a single coated lens was optimized for red light (unlikely) it would perform poorly with violet light or vice versa. I assume most single coatings are optimized for green and thus fall off on reds and violets to some degree. The idea behind multi-coating is that by applying different coatings that are optimized for different frequencies of light, the entire visible spectrum can be covered. Different manufactures coating's are optimized for different freqencies which is one reason why lenses of the same design that are equal in sharpness may produce images of different tonal and contrast characteristics.

I recently converted an old 116 roll film camera (2 1/2 x 4 1/4) to

use 120 film for 2 1/4 x 4 1/4 images. Currently I'm using a

90mm f/6.8 Graflex Optar lens. I'd like to get something a bit wider

like at least a 65mm. Does anyone know of a low cost (around $200.00)

65mm or wider lens that will cover this format at infinity? Thanks.

Try Photo Finishing Specialists http://www.pfsphoto.com.

I recently receive my third roll of 120 film back from the Kodak Processing Lab in Rockville, MD that had what appeared to be light leaks. I normally would not find this too unusual since I like to use older folding cameras which can sometimes have light leaks around the bellows or red window. I was looking at the film and also the camera to try to find were the leak was occurring. I found it odd that the leak occurred inside the exposed image area and was not consistant frame to frame. It also had a well defined edge on one side. I decided to pull out some film I had processed a few months ago that also had light leaks. When I looked at the older film I noticed that the light leak pattern looked the same. I put one on top of the other and sure enough the patterns match up perfectly. These two rolls of film came from two completely different cameras. Obviously these light leaks occurred during processing, not while the film was in the camera. Either they have a problem with a piece of equipment or it's operator error. I you have your 120 film developed at this lab, just beware that they may come back with what appears to be a light leak. I have not contacted the lab yet to let them know they have the problem, but will do so as soon as I can find their telephone number.

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I have a 616 film camera that I have converted to use 120 film for

2-1/4 x 4-1/4 images. Initially I was able to get processing and contact prints made from the Kodak lab in Rockville, MD. However, now they even refuse to do the processing. I have a local lab that will process, but need to find a lab that will at least make contact prints and preferably can make enlargements as well. Anyone know of such a lab? Thanks.

Does anyone know the exact dimensions of the 6x12 panoramic format? Thanks.

The Daiichi Zenobia 6x4.5 folding cameras were available with either a Hesper or Neo-Hesper lens. Does anyone know the difference between these lenses. Are these lenses 3-element or 4-element lenses? Are the optics coated? How is the image quality? Thanks.

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Being strickly and amateur who uses nothing but print film, I can certainly recommend Royal Gold 25. I also shoot 6x7 Medium format and in my opinion RG 25 in 35mm comes very close to the tonal, color, and grain qualities of 120 film. I have never used Reala in 35mm, but in 120 I like it. However, I don't believe that it has quite the color saturation the RG 25 has. The main thing to consider when working with print film is that if you don't do your own printing, find a lab that is willing to work with you in getting the colors and exposure on the print to what you feel is right.