Mirror position in bended optical path

Hello,
I am trying to build a magnifying lens system consisting of an
infinity-corrected objective (L1) and a focussing lens (L2) (f=200mm).
Between the objective and the lens is a beamsplitter (BS) to include
an illumination. I think in principle this is pretty much a standard
setup.

| () \ () |

O L1 BS L2 I


The problem I have: The overall length of the system is much to long.
Therefore I would like to bend the optical path one or two times but I
am not sure where to put the mirrors to do that.
There is the option to put them within the (quasi) parallel part of
the optical path, somewhere between L1 and L2, or within the focussing
part behind L2.

Option 1:

| () \

\ / () |

O L1 M1
M2 BS L2 I


Option 2:


| () \ () \

\ |

O L1 BS L2 M1
M2 I

I suppose that the position of the bending-mirrors will affect my
optical imaging, but I am not sure in what way. Therefore my question
is, What will be the better choice of mirror-position.
Thank you very much,
Sven Dudeck
.

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