Some information on windscreens.
http://www.filmebase.pt/Wind.htmlI recently investigated windscreens and decided to go with DPA.
I did find this information on adverse affects of windscreens and
high frequency roll off.
I found this at the schoeps site.Adverse Effects on Sound Quality:
In general, when comparing two windscreens which are equally
efficient, the smaller one will always have a greater influence on
the sound. Conversely, if two windscreens have the same size, the
more efficient one has the greater adverse influence on sound
quality, usually impairing a microphone's frequency response as well
as the polar pattern of directional microphones. It is thus
advisable to select a windscreen that is no more efficient than
necessary, and as large as feasible.
Acoustic foam windscreens generally do no more harm than to cause
some roll-off at high frequencies. This can be corrected either
through electronic equalization or by choosing a brighter microphone
capsule (e.g., MK 3). Hardshell basket windscreens, however, produce
irregularities in high-frequency response (depending on the type of
capsule) which cannot be easily compensated for and which color the
sound noticeably. With pressure-gradient transducers they also
reduce low-frequency sensitivity and directivity.
The use of hollow-sphere foam windscreens on pressure-gradient
transducers leads to much less roll-off and coloration at high
frequencies, but also reduces low-frequency sensitivity and
directivity.
Peace out,
Wiggler