charlie g wrote:
Hi, Ian, love that black enamel! I sadly found out years ago that LOMO apochromatic objectives I purchased to have a group of apos, at low cost...well my circa 1980's Nikon Labophot/ Din standard..45 mm objectives barrels could not 'rack down for RMS short barrel objectives'...those LOMO apo objectives do not function with my Labophot. Older stands I have can 'rack down to focus with the RMS (short barrel objectives)...and these older stands can 'rack up for function' with Din 45 mm objectives.
To me it sounds like you also needed to place your short barrel/RMS objectives on an older ( pre-Din standard 45 mm objective barrels) stand for function. Is that what you mean when you note that your elegant Zeiss Jenna NF accepts both RMS short barrel objectives ( like the LOMO's you acquired)...and yet this NF stand can in range of focus adjustment function with Din 45 mm objectives?
I thought the short barrel/finite objectives are termed: 'RMS standard', and 'Din standard' only refers to the longer 45 mm objective barrels?
With my circa 1980 Din 45 phase setup..compatible phase annuli are paired...one annulus disc substage in condenser, the second annlus embedded in the phase objective..these are centered with a 'phase telescope occular'...I see for your standard phase kit (Din 45 mm) ..the objectives (each etched with it's annular disc spec), I see the phase telescope, but where are the substage condenser collection of annular discs in your kit?
Beautiful stand you have tricked out with a variety of components, thank you Ian for this showcase and story of this elegant stand. Charlie Guevara
Hello Charlie, the problem for me with the Zeiss Standard is that DIN 33 objectives cannot focus - the stage would not rack up high enough. I did get hold of a Zeiss DIC extender which enabled me just to focus, as long as I didn't fully screw the objective in - so for me a horrible compromise - particularly as doing this is not recommended in terms of good optical practice.
RMS standard is apparently 31mm and DIN standard 45mm.
Phase on the Zeiss Jena is very simple - a single anuli is placed in the light well and the zoom condenser is zoomed up and down to math the anuli with the rings in the objectives. This allows me to use just about any phase objecitve including the LOMO WI 70X 1.23 that many people complain they can't find a matching phase condenser for.
Variable phase is a little different - an add-on is attached to the pancratic condenser - again with one phase ring - and the zoom condense zoomed until both anuli are matched. I'll attach some photos when I get home to better explain this.