Noblex 150 focus

[Willem-Jan Markerink <w.j.markerink@xxxxx>]

While replying to some newbie questions about the Noblex 150 fix 
focus model, I realized that DOF does not include infinity until 
f8....while the manual suggests it does:

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
FROM: w.j.markerink@xxxxx (Willem-Jan Markerink)
SUBJECT: Re: Noblex 150 film loading question
DATE: Sat, 15 May 99 18:09:35 GMT
ORGANIZATION: A1 Internet news-server
NEWSGROUPS: rec.photo.equipment.medium-format

In article <373D1B68.50C1@xxxxxxxxxx>,
   Roland <roland.rashleigh-berry@xxxxxxxxxx> wrote:
>I have just got a secondhand Noblex Pro 06/150. There is no instruction
>book to go with it. It takes 120mm roll film. If you know how to use one
>of these then could you please advise me on loading the film. Where
>should the "starts here" line come to

There is a red dot on the bottom, in the middle of the film rail.
Subtle, but present....:-))

>and how many times should the film
>be wound on before the film is ready to take its first shot?

Until the wind-knob goes no further (it locks).
But, assuming you have done several idle shots, the knob isn't at the right 
position right now....before loading, it must have been through all the 6 
frames, and the indicator stops rotating at the end of the roll (the knob 
itself still rotates to wind on the remaining part of the film, and you can 
feel resistance in the knob itself). You then normally remove the film 
(imaginary now), put in a new one, align at the red dot, PRESS THE RELEASE 
BUTTON ONCE (camera off preferably), and then turn the knob/wind on the new 
film until the indicator locks at frame #1.

Note that winding on the remainer of the film can sometimes result in 
jamming, because the film doesn't align properly at the end, and wraps 
outside the spool....don't use large force, simply open the back in subdued 
light, this happens mostly only on the very end of the film.
It also varies with film type/brand.

>Also, is infinity included in the DoF at all F stop numbers?

Mmm....not at f4.5 I believe, the DOF table (from manual) is written as 
'down to X meters', and it starts with f5.6 / 3.3m, suggesting that f4.5 
does not include infinity. This goes further with 2.7m (f8), 2.2m (f11), 
1.7m (f16)and 1.3m (f22)
Other proof: even with the focussing models (06/150 F & U), the 
infinity-setting at f4.5 gives a DOF of 130-6.8m (f5.6 gives a DOF of 
infinity-6.1m, to show the difference with your fix-focus DOF). 
Mmm....now I look at that table, the "5m" setting for the focus models only 
includes infinity from f8 and smaller....at f8, DOF is 
infinity-2.6m....which suggests that you also need f8 with the non-focus 
models to get infinity (see above DOF data). Not nice....

Two additional pointers/recommendations: check my homepage for some general 
panorama chapters, and consider subscribing to the Panorama Photography 
Mailinglist, which can be found in the overview of photo mailinglists on 
the PhotoForum site (linked at my homepage).

(posted & mailed)


--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]