Its about like tree sap as it comes out of the tree, flows about 6 inches an hour.I have heard the expression "January molasses",
turpentine is inexpensive, use it to thin the balsam.On another note, it looks like this canadian balsam has indeed thickened up. It's nearly stringy when I put a blob on a piece of paper. All I have on hand is acetone , naptha, or 99% isoptopyl. I'm not going out and spend money on xylol just for this.
Color fringing or other minor errors in the image or a reduction in overall image quality.I wonder what difference it would really make if a doublet like this was put back together turned from original position. Lenses in this day and time are ground to the jillionth of an inch in precision. I suspect nobody would ever notice one bit of difference in picture quality.
I hope you made an index line or two on the side before separating. Cemented pairs are usually optically aligned.
Over here turpentine is only available at artists shops.turpentine is inexpensive, use it to thin the balsam.
Doublets have been used with a drop of oil between the elements.
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