Tuesday, 22 March 2011

Argon sun 488nm 70mm f11

argon sun 70mm f11 lrg, originally uploaded by Mark Townley.

Compared to the continuum image of the same area, this area is quite a bit lower in resolution. This is due to the lower transmission value of the argon filter, only about 50%, as a result there is quite a bit more smearing visible - known as 'seeing smearing'. This can be combatted by using a lower density primary filter on the scope as opposed to the solar wedge, and as result get the exposure time considerably shorter. By doing this I think imaging at this wavelength will yield some interesting results - so, watch this space!