I also too find this feature of modern lenses to be very astro-unfriendly roger, what a waste of precious imaging/viewing time! what bugs me, is how the heck do you put a kendricks dew heater strap on the lens and stop it from pulling/tugging on it and changing focus once achieved - can ya lock the focus in manual? with the old film primes, we just position the kendricks so it pulling the focus hard up against infinty, if anywhere at all - hard right or left as you know - how the heck is this achievable with the dslr stuff? i mean even the primes have multiple infinities!
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