Yes they are massive beasties. The MTO lens has a TWO-ELEMENT achromatic corrector (!) with about 4cm of solid glass up front. I expect yours does, too. Take a close look at the reflections you can see in the front corrector...
BTW is the corrector coated, or uncoated ? Mine was uncoated and after 4 surfaces was losing about 50% of the incoming light through reflections.
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