I got it 'cheap' last month, less than a 20 dollar bill after shipping, I
had only put a bid on it to watch it, and on occasion I get stuff that
cheap.
I didn't understand everything you mentioned.
Using a 3.8 lens, that would make it about a 6.3 right?
Using a f8 it would be a f10?
Actually I know I didn't understand, the confusion must be 'stops'.
How many numbers is an F stop? Or is this that 1.4 times itself thing?
I have a 2 X Vivitar too, rather nice considering it isn't a Zuiko, but it
does lose some clarity, I didn't check it out across the room against the 3
X, maybe I can do that during the thunderstorms tomorrow hen I don't want to
be outside.
Ahh.. I have a book and I understood something, it is the 1.4 thingy. SO I
multiply 3.8 or 8 times 1.4, two times to get an idea of where my new F stop
is likely to be.
f3.8 x 1.4 = 5.32 x 1.4 = 7.5... acceptable if the glass is any good.....
f8 x 1.4 = 11.2 x 1.4 = 15.7 that's going to be fun......
And again, my shutter speed should be 1/the lens mm?
So a 210 mm lens with 3 x teleconverter should have a shutter speed
somewhere around 1/600?
Scott
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Piers Hemy
Sent: Tuesday, February 27, 2007 1:28 AM
To: olympus@xxxxxxxxxx
Subject: spam: [OM] Re: Vivitar Automatic Tele Converter 3X-21
I remember getting a 3x TC decades ago, thinking it woul be the answer to
not being able to afford longer lenses. It will cost you 2.5 stops by my
reckoning - an f/2 aperture will have the effect of f/6; an f/4 the effect
of an f/12.
Do I sound very unenthusiastic?
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Scott Peden
Sent: 27 February 2007 06:43
To: Scott Peden
Subject: [OM] Vivitar Automatic Tele Converter 3X-21
Can anyone tell me what quality this is? It is 58 mm long or 2.25 inches
long.
Anyone know how many F stops I lose when I use this?
I tried googleing this a couple of times and can't find out anything.
I just put it on a 3.8f 210 mm Haminex lens and the initial tests (indoors,
corner to corner in my bedrooms) amazed me, I thought I was using my nicer
2X Vivitar lens that is about 1.5 inches thick. I've got to have good
weather to try this out where I have been shooting the Red shouldered hawk.
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