I think an 0.5X lens was around $100 the last time I checked, It clamps to the 58mm diameter accessory ring that spins on to the end of the M7A's objective. 25 years ago, but were then not quite able to. It is based on the M7 they tried to make for Wild ca. You can use many accessories from Motic for their K700 microscope. Wild accessories can be expensive if you are in a hurry. I have an adjustable pair from Olympus and another from Zeiss, both of which are parfocal if you adjust them to their limits. High eyepoint oculars from other manufacturers will also work – just make sure they are adjustable because Wild put the intermediate image further in from the flange than almost everyone else. The earlier Wild 10/21 oculars are a low eyepoint design the later 10/21B are high eyepoint for eyeglass wearers. It was and still is a nice design with a well-corrected, four element achromatic objective (the M3 has three elments the M8 has five). Wild/Leica made the M7/M7A models for 20 years, and continued making the M7A even after introducing the later M3x models that should have superceded it. Other than a couple fogged ocular head prisms, probably from someone using the wrong grease, it needed no other service and was still in its original alignment.
I have a Wild M7A that was retired from three decades of inspecting chip on board wire bonds for an automotive electronics supplier. It seems that the objective diameter is 52 mm (can sb confirm this), so I might be able to get some alternates. If I get the microscope, I would like to get at least a 0.5x lens. Another potential issue is Wild Heerbrugg accessories are quite expensive on ebay (if they even fit on M7A - User's manual does not list part numbers for the accessories but I assume they should be interchangeable among some of their products). Any other related documents would be helpful too. Does anyone have experience with M7A? I would like to find the service manual, if it exists at all. I believe that eyepieces do not have high relief but I could not find that information (there is no eyeglasses symbol).
There is much more information and discussions available for their other models like M5 and M8. I was trying to find more information about this particular model but I only found a users manual and some general information about the company and their products. I know this brand is generally highly ranked. It has (what I believe are) standard eyepieces 10x/21mm but the stand is not Wild's - it looks like standard StereoZoom 4 stand with boom. I will be able to see it in 10 days but by looking at the pictures and per discussion with the owner it seems to be in decent condition - only few minor scratches on the body. I have an opportunity to buy Wild Heerbrugg M7A microscope at (what I think) is reasonable price.
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