Nothing doing

Clouds, rain, thunder and more clouds. Not much going on recently.

I bought 72mm and 82mm IDAS LPS-P2 filters to use with camera lenses. On the modified 5D, unlike cropped-frame cameras, there is no room to put an "FF" filter behind the lens and in front of the mirror box. So, I will use these filters on the front of lenses. They can also be used with my E-620, and in 'scopes that can cover a medium format frame.

After trying to buy Kenko R64 filters, which apparently have been discontinued, I bought various B+W 091 MRC filters from B&H. Stacking an 091 filter with an LPS-P2 results in a very wide (30-40nm) H-alpha filter.

In the testing pipeline is:

Scopes:

• Pentax 125SDP vs TOA130F w/35 flattener


• Pentax 125SDP with 67 reducer vs TOA130F with 35 reducer


• Borg 125SD 67 reducer vs 35 reducer


• Borg 125SD with 67 flattener


• Tak FCT-125


• Pentax 75-SDHF vs Sky-90 vs FSQ-85ED vs Borg 77EDII (and perhaps WO M80FDII)


• ETX-90 vs Q-3.5

Lenses:

• Pentax 645 300/4 ED IF


• Olympus OM 300/4.5


• Olympus OM 350/2.8


• Olympus OM 250/2


• Canon FD S.S.C Fluorite 300/2.8


• Sigma 400/5.6 APO


• Olympus ZD 150/2


• Nikon 180/2.8 ED


• OM 50/1.8 vs OM 50/1.4 vs OM 50/1.2 vs Pentax 55/1.8


• OM 24/2.8 vs OM 28/2.8


• CZJ 135/3.5

In the "hack write-up" pipeline:

• Vixen SXW Dec adjustment


• QHY8 fix follow-up