previous page in this flare test
article
Within the distance of 22cm (from the centre) I found to be the normal
field of view.
Whatever is in this zone is what we can see through the viewfinder and
is what we want our completed image to contain.
So I have marked this area in GREEN.
When my light source was placed just outside the field of view zone I
saw that there was the starting of an illuminated area on a wall inside
the mirror chamber of the camera.
This became a progressively larger and more brighter reflection until
it was its maximum at 36cm from the centre line.
The image below shows this 36cm refection off the right hand wall.
As the distance away from axis increased this reflection gradually
(slowly) got less but it was still extreme over a wide variety of
angles until 55cm.
At the distance of 55cm this is where the hood actually starts to work.
Amazingly the hood only becomes effective OUTSIDE the area where it is
most needed.(36cm)
The designers obviously never checked to see if this hood design
actually worked as intended.
Really the hood for the 80mm lense should have been made at a much
sharper angle so as to block light beyond the 22cm zone.
Perhaps this hood was intended for use with a wide angle lense and they
just gave it with the 80mm Arsats because they had the same filter
thread or maybe at the Kiev factory they just had no idea at all.....
Whatever the case , this hood should not be used with this lense. !!
But wait , there's more ...
next page in this flare test article
