Blurry pictures
Refocus your camera's objective lens. If the pictures remain blurry, then your preamplifier might be producing phase shift. If possible, only use a direct-coupled (DC) preamplifier. Most integrated preamplifiers are direct coupled. If you have a discrete preamplifier, it must include no coupling capacitors or transformers between transistors. Capacitors and transformers cause phase shifts that can destroy your picture. Electrolytic capacitors also introduce leakage, which will further degrade your image.
Exception: You may couple your input transducer with a capacitor. While even this capacitor will affect your images, eliminating this capacitor might upset preamplifier bias. Improper bias is the greater evil. An input capacitor can also prevent DC bias current from flowing in the transducer. Such current can damage a solar cell input transducer. Check your circuit to see if you can operate without the input capacitor.
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