Quote from rmorse:
The only way to do that without a calendar, is to buy a 1 X 2 put spread, where the ATM put you sell 1, and the OTM put you buy twice as many. It needs to be a credit spread. If the stock tanks, the OTM puts become ATM, you'll have +Vega on the down side. If the stock stays the same or goes up, your credit spread makes you money.
Sure, but it's not long vega/theta at inception.