My popup flash on my nikon d40 didnt fire when i open the popup, and cant take picture..

Film Cameras were NIKON TTL Nikon Digital Cameras are I-TTL. These two systems are not compatible. Film cameras did the metering in real time. When enough light struck the film the flash was turned off. With I-TTL the flash fires a quick flash and the image is quickly analyzed and the flash fires again to take the photo. With digital it is delayed and it is NOT in real time. The camera only looks at a few pixels to make the analysis fast. I hope this helps

Hi,

If it clicks when the flash is already open, it seems there would be a problem with the flash open sensor. The camera thinks the flash is closed, so it tries to open it again and it refuses to fire, because firing in the closed position would blow the bulb.

The D40 flash is a bit different, but if you open it (just unscrew the two little screws in front) you'll recognize the sensor clips. Open and close the flash and see if the make contact when open.

(And DON'T fire the flash when open, or at the very least don't touch anything in there when firing or you'll get zapped.

Goodluck..

Are you sure you're using fresh batteries?

It sounds like you're trying to use the SB-600 off camera, as a slave flash. While the SB-600 does indeed have slave capability, the D40 does not have the ability to function as a commander. Thus, the SB-600 is being triggered by the D40's pre-flash.

As stated above, the D40 does not function in commander mode. You can mount an SB-800 or SB-900 flash unit, which will function as a commander as well as a flash. Or you can mount an SU-800 commander unit.

Alternatively, you can switch the D40 to manual flash mode so as to eliminiate the preflash. However, you will then have to calculate the proper exposure yourself.

there is a sensor in there that tells the camera the flash is up you need to take it to a repair shop its not a at home thing

What white balance mode are you using? Try changing it to Auto. Did you ever try to clean the sensor?

The D40 will not take great photos of an indoor event without blurring or noise. You need a fast lens and a high ISO using the popup flash or on camera flash would be ideal but some of these events you can not use flash. All these images I shot with a Nikon D40. http://www.facebook.com/home.php?src=fftb#/pages/Keller-TX/Raving-Design/78762448229?v=photos&ref=ts Learn to use the camera for ur events. Experiment it's all about trial and error. Ray

is it set to auto? if not i suggest you check the aperture and shutter speed setting :)

If lightning bolt icon is blinking in viewfinder, flash is not ready. Either flash isnt popped up all the way or flash strobe tube is bad.

If it clicks when the flash is already open, it seems there would be a problem with the flash open sensor. The camera thinks the flash is closed, so it tries to open it again and it refuses to fire, because firing in the closed position would blow the bulb.

Here's a <a href='http://photo.net/bboard/uploaded-file?bboard_upload_id=42254384'>photo of the sensor in a D70</a>. The D40 flash is a bit different, but if you open it (just unscrew the two little screws in front) you'll recognize the sensor clips. Open and close the flash and see if the make contact when open.

(And DON'T fire the flash when open, or at the very least don't touch anything in there when firing or you'll get zapped.