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Re: [OM] OM4 Ti

Subject: Re: [OM] OM4 Ti
From: "Tom Trottier" <tom@xxxxxx>
Date: Mon, 19 Jul 1999 15:26:43 -0400
Tim,

To test shutter speeds at home, at least from 1/60th up, you only need 
a TV. The TV screen (NTSC - NA & Japan) is repainted each 60th of a 
second with 212 horizontal lines. (PAL & Secam  differ  in frequency & 
lines, sorry,  please look it up).

So take a picture with some light & uniform subject showing, & count 
the horizontal lines that show :
lines   Shutter Speed   
212     60              (full screen)
101     126             (= 60 * 212 / lines) (1/2 screen)
51      249
25      509
13      978
12      1060
11      1156
10      1272
9       1413
8       1590
7       1817
6       2120
5       2544
4       3180
3       4240
2       6360
1       12720

Tom

--- Original Message ---
From:                   Tim_Grange@xxxxxxxxxxxxxxxxx
Date sent:              Mon, 19 Jul 1999 05:14:54 -0400

> Dear Olympus Mailing List Subscribers,
> 
> I am new to the list and would like to ask the advice of members on the
> following:
...
> 2. Reading the 'crash test' on the OM4 Ti posted on R Lee Hawkins' site, it
> seems that the camer's shutter speeds may not reflect the true duration that 
> the
> shutter remains open. Is there any way that one can test this easily at home? 
> If
> I buy the body, I intend to do a full test to make sure it is in full working
> order (it comes with 12 months guarantee). I would also like to test my OM2N
> body as well.
...
> Tim Grange
------------------
From:Tom Trottier, President, ACT Productions Inc.
tom@xxxxxx                      http://www.act.ca
+1 613 594-4829               fax +1 613 594-8944
199 Holmwood Ave, Ottawa, Ontario, Canada K1S 2P3
"Make it as simple as possible, but no simpler" - Einstein

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