larry_albert

Don,

<p>

What luck, I just came to MFD from the Mamiya pages and had been reading how to order a manual.

<p>

***** Start of snipped copy from Mamiya's page ****

Since Mamiya receives many inquiries on obtaining

instruction booklets for cameras, we are listing this

information here for Forum users.

<p>

Instruction booklets for current and discontinued Mamiya

cameras are priced at $8 each, including first-class postage

to anywhere within the US.

<p>

***** End of snipped copy from Mamiya's page *****

URL - http://mamiya.com/cgi-bin/WebX?13@^2496@.ee6b860

<p>

Go to the above page for instructions about where to send your money.

<p>

Their home page mamiya. com has a link to User Forum which

then has a link for Older Mamiya Cameras lots of discussions of the

220 and 330 cameras. User Forum will also link you to Ordering

Instruction Manuals

<p>

Good luck,

<p>

Larry

George,

<p>

Bay1 filters for the Roelli are still listed as available in

the latest B&H Photo catalog. B+W offers Bay 1 filters

and calls them size B1. I did not find any Bay 1 filters in

the Tiffen listings.

<p>

B&H web address follows ---

<p>

http://www.bhphotovideo.com/photo/filters/navigation.html ---

<p>

Hope this helps. B+W may be your only choice for new

Bay 1 filters. Yes B+W filters do cost more than other

brands. Are they worth it? I am not going to start that

fight.

<p>

Good luck,

Larry

William Ju (wju@ibm.net)

Report on Fuji 670

<p>

For a discussion of the Fuji 617 you should read the report from a

satisfied user - Philip Greenspun of photo.net.

<p>

Go to his site (address follows)

http://www.photo.net/photo/index.html

About half way down the page you will find the following;

Fuji 617: Want to have panoramic negatives bigger than

most folks' proof prints?

<p>

That link will take you to:

Fuji 617 by Philip Greenspun for photo.net.

http://www.photo.net/photo/fuji-617.html

<p>

Hope this helps,

<p>

Larry

Use the focal length of the lens you are using.

<p>

If you use the "equivalent focal length in 35mm" the resulting hyperfocal distance will be for a

lens of that focal length PERIOD, not the length you are actually using.. The formulae for

hyperfocal distance do not include anything about the film size.

<p>

You can get formulae for the hyperfocal distances and put them into a spread sheet and calculate

the ones YOU need. Several links follow that have the formula you want and other formulae that

might be of interest.

<p>

**** This first link is simple and straight forward. *****

<p>

http://www.photo.net/philg/photo/optics/lensFAQ.html

<p>

**** Here is Question 9 copied from that link. *****

<p>

Q9. What is hyperfocal distance?

<p>

A. The closest distance that is in acceptable focus when the lens is

focused at infinity. (See below for a variant use of this term.)

<p>

h = f^2/(N*c)

<p>

*** Larry is adding information starting here

<p>

f = focal length of the lens

N = f stop (the one being used - not lens maximum aperture)

c = diameter of the "circle of confusion"

h = hyperfocal distance

<p>

NOTE: ALL dimensions above are in millimeters. If you want hyperfocal distance to be in feet

or meters you must include a conversion factor.

<p>

end of the information that Larry added.*****

<p>

***** formula for "depth of field" calculations are also at this link *****

<p>

Some more links which have similar information follow in this posting.

<p>

***** Two more links from http://www.photo.net/philg/photo/optics/lensFAQ.html the home page

of "Willem-Jan Markerink" w.j.markerink@a1.nl I am listing the links because his server has

not been sending the entire page. The problem is know and being worked on.

<p>

A nice program for calculating 'Depth of Field' and 'Field of View':

http://waterworks.com./~tfv/dmatic.htm DOF & FOV

<p>

Another DOF calculator:

http://swissnet.ai.mit.edu/photo/

<p>

**** Another link from http://www.photo.net/photo the site of Philip Greenspun *****

<p>

http://www.photo.net/photo/optics/lensTutorial.html

<p>

You will discover that there is no universal agreement on the correct size for the

"circle of confusion." All hyperfocal distance and depth of field calculations require

that you include a value for the "circle of confusion." Q8 from the first length gives

a simple explanation for the "circle of confusion."

<p>

Hope this helps,

<p>

Larry