Pellicle Mirrors

*

*image ganked from Wiki.

A friend (Ryan Harvey) just got an old Canon EOS-1N RS, and after letting me play with it and hearing the speed and quietness of the shutter, I became instantly fascinated with the Pellicle mirror concept and wondering why it's no longer used.

Basic rundown:
http://en.wikipedia.org/wiki/Pellicle_mirror

PROS-
• Viewfinder never goes dark
• No mirror shake
• Pictures can be taken a faster rate (10 frames/second)
• Very quiet shooting

CONS-
• Light loss to film (2/3 stops)
• The mirror needs to be kept perfectly clean
• Pellicle mirrors are thin and especially fragile
• So, cleaning a Pellicle mirror is difficult
• Image degradation due to linear astigmatism from the thickness, refractive index (higher than air), and distinct angle of the mirror
• Possible image fogging due to light from viewfinder and non sealed-off focusing screen


While, as the technology exists now, its cons tend to outway its pros (light loss probably being its biggest drawback); its ease of speed (9 fps SLR in 1972!), quietness, and constant viewfinder image make it a very enticing concept, especially to outdoors, sports, and photojourn shooters.

So, why no Pellicle mirror dSLRs?

I would think that certain "recent" digital advances could lessen its other flaws. For instance, internal sensor cleaning techniques could be adapted to solve the mirror dust/cleaning problem. The fragile nature of digital sensors makes the Pellicle mirror's safety somewhat of a non-issue, because dSLR shooters already have to pay extra care when changing lenses, handling camera bodies, etc. Image fogging from the viewfinder could simply be solved by an included eyepeice cup, and cover or hatch (such what's already on high-end Nikon SLRs). And even the light loss problem is lessened with the advances in low-grain high-ISO speeds.

So, again I ask, why no Pellicle mirror dSLRs?

Hopefully, it won't go the way of other lost photo-technologies, like the Foveon chip, and be grabbed-up by Sigma and slapped on some less-than-worthy, low performance, prosumer body...


Cameras with Pellicle Mirrors:
• Canon Pellix QL (1968)
• Canon F-1 High Speed (1972)
• Nikon F High Speed Type 2 (1976)
• Nikon F2H (1978)
• Nikon F2H-MD (1984)
• Canon EOS RT (1989)
• Canon EOS 1N RS (1994)
• Nikon F3H (1998)

References:
http://en.wikipedia.org/wiki/Pellicle_mirror
http://everything2.com/e2node/pellicle%2520mirror
http://www.nikonians.org/forums/dcboard.php?az=show_topic&forum=141&topic_id=30361
http://forums.dpreview.com/forums/read.asp?forum=1000&message=28938364


Comments, opinions, and questions welcomed.

Helpful Links

I try to include, within my page, lists of helpful photography web links. For those who may not have noticed or explored them, here are a few that stand out and that I feel are especially useful:

Freestyle Photographic Supplies - offers a variety of hard to find and diverse film and paper types, including infrared, reversal, and litho film.

Huemaxx Co. - Information on the best local place to buy or repair mechanical cameras of all types

JPG Magazine - Made entirely by photography submitted and voted on by photographers. Join, submit, get published.

The Massive B&W Dev Chart - Easily find developing times for a complete list of black and white films and film developers.

B&H Photo Links - An extremely useful and hard to find page within the well-known B&H Photo website, containing a comprehensive list of photography equipment, publications, and resources.

35mm SLR Resource Page - A useful site for any Nikonian, full of reliable information on various Nikon cameras, lenses, and assorted equipment. Also, includes info on Canon FD, Canon EOS, Olympus, Minolta, Pentax, and Contax cameras and equipment.

Antique Camera Manuals - Have an old or antique camera and not sure how to use it? Chances are you can find its manual here, and download it as a free PDF file.

Polaroid Camera Collection - Useful site for any Polaroid lover, containing information on a host of classic and antique Polaroid cameras and film types.

How Canon lenses are made - An interesting and informative flash video and walk-through on how modern Canon lenses are made. Any fan of the History Channel or "how-its-made" shows should enjoy this.

Mozilla Firefox Cheat Sheet - Anyone new to Mozilla Firefox or anyone who would like to use it more efficiently should find this page useful.

Ebay Typos Search - A great site for any Ebay bidder. Type-in an item you would like to find, and this site will search a wide range of common miss spellings allowing you to buy cheaper by finding items others wouldn't.

Let me know if you find any of these useful.