EMO-Optik Arthur Seibert Octoscop L

MTC Photography · May 1, 2000

<h3>

EMO-Optik Arthur Seibert Octoscop L</h3>

</tr>

</table>

<hr>

<center>EMO-Optik Arthur Seibert Octoscop

L

Another unique optical instrument from EMO-Optik

Arthur Seibert EMO Wetzlar is Octoscop L

Octoscop is an 'Universal

Vest-pocket Magnifier" . It consists of four

loupes of 2x, 4x 10x and 18x.

These four loupes can be combined to make

6x 14x 20 x and 28x for a total of eight magnifications, hence

the name "Octoscop" ---- eight loupes ( 2x, 4x, 6x, 10x,14x, 20x, and 28x )in one package

<tr>

</tr>

</table></center>

The four loupes are :

<tr>

<td> 2x

plano-convex</td>

</tr>

</table></center>

<tr>

<td> 4x loupe

plano convex</td>

</tr>

</table></center>

<tr>

<td> 10x loupe

cemented

achromat

loupe</td>

</tr>

</table></center>

<tr>

<td>18x three element loupe</td>

</tr>

</table></center>

4x loupe and 18x loupe

are arranged in the form of an

8 butterfly

2X LOUPE

AND 18X loupe are also arranged in another pair of 8

butterfly

These two pairs of

8 shape primary loupes can be combined to make

(14x 20x) and (6x 28x) compound

loupes.

In the following table:

<ul>

<li>

same colored pairs belongs to one

butterfly</li>

<li>

(2x 10x) and (4x 18x) are primary

pairs</li>

<li>

(6x 28x), (14x 20x) are compound loupe

pairs from the two primaries.</li>

</ul>

<ul>

<tr>

</td>

</td>

</tr>

<tr>

</td>

</td>

</td>

</tr>

<tr>

</td>

</td>

</td>

</tr>

</table></center>

</ul>

<h2>

Octoscop

specification</h2>

<ul> Primary

loupes :

<ol>

<ul>

<li>

2x plano convex</li>

<li>

4x plano convex</li>

</ul>

</ol>

<ol>

<ul>

<li>

10x cemented achromat doublet</li>

<li>

18x three element in two group; cemented

doublet + plano-convex</li>

</ul>

</ol>

Compound loupes

<ul>

<li>

6x = 2x and 4x</li>

<li>

28x = 10x and 18x</li>

<li>

14x = 4x and 10x</li>

<li>

28x = 10x and 18x</li>

</ul>

<ul> Dimension

<ul>

<li>

length ; 78mm</li>

<li>

width: 30mm</li>

</ul>

Weight : 30 g

Packaging :

<ul>

<li>

Black plastic box 4x 9x13cm;</li>

<li>

Genuine black leather case</li>

<li>

Neck strap</li>

</ul>

Made in Germany

<h2>

Application of Octoscop</h2>

EMO-Optik Seibert Octoscop is

the most versatile combination

magnifier offering eight different

magnifications.

The rule of thumb for viewing slide/negative

with correct perspective

is magnification= 250/focal_length

of lens(in mm).

Therefore, different magnifications of

Octoscop is suitable for viewing chrome transparency or negatives

for all kinds of format, from

large format, medium format, 35mm

to subminiature photography

<td>Magnification</td>

<td>Combination</td>

<td>

<center> Composition</center>

</td>

<td>Best for viewing slide/negative of</td>

</tr>

<tr>

<td>plano convex</td>

</tr>

<td>plano convex</td>

<td> f=60mm: Leitz 60mm/2.8 Macro-Elmarit</td>

</tr>

<td>2 element 2 group</td>

<td>f=35mm to 50mm ;Minoxar/Minotar</td>

</tr>

<tr>

<td>cemented achromat doublet</td>

</tr>

<td>3 element 2 group</td>

</tr>

<td> three element in two

group; cemented doublet + plano-convex</td>

<td> COMPLAN/MINOX 15mm lens</td>

</tr>

<td>4 element 3 group</td>

<td> fine detail</td>

</tr>

<td>5 element 4 group</td>

<td> fine detail</td>

</tr>

</table></center>

</ul>

6x loupe is particularly suitable

to view slide made from camera lens

with focal length from 35mm to

50mm, resulting in realistic perspective.

Similarly, using 18x to

view Minox 8x11 slide or negative resulting in

realistic perspective.

Further, if proper loupe

with right magnification is used, the image has a 3-D feel, because

of monocular vision in viewing slide/negative with loupe.</ul>

</ul>

MTC Photography · May 2, 2000

<a href="http://www.benmeadows.com/store/product_group.asp?dept_id=2487">Benmeadows.com Octoscop L</a>

MTC Photography · May 2, 2000

Octoscop is perfect for examination of Minox 8x11 negative or chrome.

I like to put the Octoscop butterfly in 28x / 6x position; using

the 6x loupe to get an overview, than switch over to 28x to examine

the finest details.

I try Octoscop on stamp; for high magnification, the working

distance is too close.

MTC Photography · December 22, 2001

EMO Macromax 5x loupe is the forerunner of Leica 5x loupe

see

<a href="http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=000Rpu">Macromax</A>

MTC Photography · October 6, 2002

<h3>Leitz Replica Microscope</h3>

Emo-Optik once produced Leitz 'Replica' Microscope, a replica of an

1899 Leitz microscope,commissioned by Leica on the 18th August 1981

subminiature · October 4, 2003

The most famous pocket microscope and telescope is the EMO Emoskop

http://www.submin.com/binocular/manuals/emoskop.htm

and

http://www.submin.com/binocular/collection/seibert/emoskop.htm

MTC Photography · April 6, 2012

Due to change of hosting site, some of the Octoscop images are missing. Here are the OctoscopL images stored at

photo.net.

SEIBERT OCTOSCOP L with genuine leather case in box

4x and 14x loupes

2x and 10x loupes

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EMO-Optik Arthur Seibert Octoscop L

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