[rollei_list] Re: Lens recommendation
- From: James Richard Tyrer <tyrerj@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 10 Aug 2010 02:43:27 -0700
On 08/09/10 04:40, Elias_Roustom wrote:
If you have removed the front cell, you should be looking at the rear
cell through the aperture.
I removed the front cells? element? and there was still glass between
me and the aperture, and glass behind that still.
What's an element and what's a cell anyway? A six element lens has six
pieces of formed glass, or six surfaces?
I think my lens looks like this in cross section: ( ( : )
--
The lens is probably a 6 element 4 group double Gauss lens so there are
2 outer elements and the two groups nearest to the aperture are probably
made of two pieces of glass cemented together.
How did you manage to remove just the front element? As I said, you
would have had to unscrew the ring that has the lettering on it.
IAC, to remove the front cell (now missing the front element) which I
presume is well stuck or you would have it out by now: The lens should
have 40.5mm (female) threads on the front that will accept a standard
filter. It is the piece of metal with those threads on the inside that
you need to unscrew to remove the front lens cell -- the threads are on
the front lens cell. I would put the front element back in first but it
probably doesn't matter. Something with 40.5mm threads will be useful.
I use a small metal lens hood. So, screw it in tight then squeeze the
lens hood (or what ever you are using) on the opposite sides (the exact
opposite of what you want to do when trying to remove a stuck filter
:-)) and unscrew. Be careful not to hold onto the aperture ring as you
will be working against your self. This works for me an then I usually
have to use something rubber or use masking tape on the smooth sides of
the cell to get the lens hood off of it.
James Tyrer
---
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