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Re: [OM] Need help

Subject: Re: [OM] Need help
From: "C.H.Ling" <chling@xxxxxxxxxxxxxx>
Date: Sat, 30 May 1998 23:18:52 +0800
----------
> From: Richard Schätzl <Richard.Schaetzl@xxxxxxxxxxxxxxxxxxxx>
> To: olympus@xxxxxxxxxxxxxxx
> Subject: Re: [OM] Need help
> Date: Saturday, May 30, 1998 7:23 PM
> 
> C.H.Ling wrote:
>  
> > At the same aperture the performance of both lenses come very close.
> > With a new purchased 55->49 adapter ring and a normal old 49mm UV
> > filter, I connected the 50/2 to the slide copier without any problem.
> 
> I´ve heard, that the "focal length", of the 2.0, is only 42mm at 1:2.
> Olympus writes, that they recomend to use it reversed on the bellows and
> that it will produce magnifications slightly larger than 1:1. Maybe it
> is the same problem, as with the 3.5 (bellows to long for 1:1 with the
> 50mm Macro), but Mordmüller writes in his book, that the 2.0 is more
> dependend on the floating element correction than the 3.5. This would
> make the solution, to get 1:1, less optimal, to set the focus ring to
> slightly lower rates as 1:2 with fully retracted bellows. 
> 

I have just check with 50/2 and 50/3.5 with OM bellows, it is true that for
better performance you have to mount the lenses in reverse position (also
to set the lens at 1:2). At that position the 50/3.5 got a mag. around
1.2x, but for the 50/2 I got a much higher mag. (around 1.5x) changing the
setting to infinity have nearly no effect, but only got softer image.  

So, if you want to take 1:1 mag. you have to mount the lens in normal
position and set the lens to less than 1:2. To obtain better result, you
have to stop down the lens to f11 or 16.

> Do you know if the 80mm MACRO Zuiko  will deliver better quality for
> slide copying? 

I am not sure, but I think so, since it is designed at 1:1 mag.

> I guess the limiting factor for copy works is the film, at least the
> film spec. papers (AGFA, Fuji, Kodak) suggest this. Some people recomend
> to copy on a biger format to get all the detailes of the orginal, not
> the way I want to go.
> I´ve done so far only copy work to negative film.
> 
> Richard
> 
I rare do slide copying, since I mainly use negative, but it is not the
major reason. I found copying slide with normal daylight neg. gave me very
high contrast. I use electronic flash for copying, since the OM cameras do
not provide multi-exposure. I have to set the camera to "B" and fire the
flash at 0.5 stop under, then remove the slide and fire the flash again at
2-3 stops under (of course I have to do at a dark room). With this method I
can reduce the contrast but the result can't compare with normal shooting
negative. 

I am considering to buy a Polaroid ProPalette 8000 for slide and neg.
recording. Then I can do the inter-neg. digitally or edit my photos then
get it record on slide or neg. Of course, with such a high pirce equipment,

I will try to work freelance with it for earning some money. (you may know
the economic situation in South East Asia, where Hong Kong cannot be
excepted.)

C.H.Ling 




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