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Re: [OM] Overextending your reach

Subject: Re: [OM] Overextending your reach
From: "Jim Nichols" <jhnichols@xxxxxxxxxxxxx>
Date: Thu, 29 Sep 2011 17:54:19 -0500
Thanks, Chris.  It has been an interesting day.  I just shot a few more 
images with the Takumar 135 and the 2X Soligor mounted on the E-1.  The 
combo is lighter than my E-1 + Telyt-R 250, and is sharp when I braced on a 
tree, but the Telyt wins out in image quality.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Chris Trask" <christrask@xxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Thursday, September 29, 2011 5:44 PM
Subject: Re: [OM] Overextending your reach


> >
>> >    I'm going to set up a more definitive test later, but the first 
>> > thing
> I
>> > need is a good colour chart or even better one of those lens test
> charts.
>> > Next time I drop in at the local camera shop I'll see if I can obtain
> one.
>> > I don't have a colour printer, so it's no point in downloading one.
> But,
>> > I
>> > do have a small Munsell colour circle in my copy of Sidelinger's "Color
>> > Manual" that I could use.
>> >
>>
>> I did my normal RAW image processing on the two images, and will post the
>> links below.  To me, the Telyt has less contrast, but more detail.  Your
>> tastes may vary from mine.
>>
>
>    I went over to the local camera shop and all they had was a very
> expensive set of those sheets with the colour rectangles, which was not 
> what
> I had in mind.  Instead, I stopped at a nearby artist supply shop and got 
> a
> pocket colour wheel used for mixing oils and water colours plus a stiff,
> dead-white piece of card stock for a background.  The colour wheel has 
> small
> lettering plus a bar code, which are ideal for this little exercise.
>
>    Now, a bit of a correction here.  My 3-element X2 teleconverter is a
> Soligor, not a Sigma as I have been saying earlier.  The 7-element X2
> teleconverter is a Sigma.  Our scapegoats and lackies regret the error. 
> :{b
>
>    The lens used here is once again a Tokina 28-70mm RMC.  For the 
> baseline
> photo the FL is 70mm and the aperture is f:8.  For the photos with the 
> three
> teleconverters the FL is 35mm and the aperture is f:5.6.  Shutter speed is
> 1/500.  Focusing is done at f:3.5.
>
>    Clarity was judged by way of an area of fairly fine text, which 
> afforded
> evaluation inevery direction on the subject plane.  Compared with the
> baseline photo, the clarity with the Sigma 7-element X2 teleconverter is 
> all
> but exactly the same.  The Vivitar X2 telemacro is a close second, while 
> the
> Soligor 3-element X2 is last.
>
>    With regard to colour, the Soligor was a bit lighter in the reds and
> oranges while the Sigma and Vivitar were virtually unaltered.  Yellows,
> greens, and blues were the same for all three.
>
>    This test reaffirms my years-long impression of the 7-element Sigma, 
> and
> gives me added confidence that the Vivitar telemacro is a worthy piece of
> field macro equipment.
>
> Chris
>
> -- 
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>
> 


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