YES, buy a light meter, which maybe cost you about RM500, or if you have smart phone, rely on digital this time, download the free light meter. Turn your smart phone to a free light meter.
iPhone do have free light meter. I'm using this. Easy and good, fast and accurate.
Pick the ISO, 100 if lomography xpro 100, then decide on the aperture or shutter speed, just either one. After you pick one, the other will automatically give you the correct reading.
Click on the area that you want the correct exposure. Just like sunset, click on the sky if you want the sky in correct exposure, the sky will has brilliant color, but you will lost the details on land, which all will be in shadow. If you want to see the details on land, click on land to get the correct exposure.
Get fun with it.