I had a D3000 in the past and it's a great camera for who want to start doing picture with great quality
I have few question..
witch kind of objectives do you use with your D3000 they must be AF-S objectives AF only will work,but no auto-focus
Witch kind of settings do you use?..automatic,no-flash,mode "P" or mode "A"
And finally,do you owned it brand new or used?
By using this kind of camera for a while..best recommanding I can tell
not use the Dlighting option,that false sometime the viewing on screen..
never remain on screen for a picture,the best way to view them is on a computer screen..
when taking picture,never put the focus on the headlight,picture will be too much dark,make the focus on the side of the locomotive give better results
if your lense have VR option,it's good on day time..on night shot,better to put it off for better results VR will false proccessing on night environment.
on day time,do not go over ISO 200 and at night time,over ISO 400 you will have risk to have noise in you pictures.(look like grains in black parts of the picture)
if you have a picture sample,just add it on a post,so we can have a much better idea..
here's a shot I did with my D3000
http://www.railpictures.net/viewphoto.p ... 1#exifshow
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If you want to improve your skill,alway's remember three things.
1) camera are only a tool,the resulst alway depending from who push on shutter button..
2)get prepared..when prepare to take a shot,choose your frame,imagine your subject and get some shot,to find the best setting,you will impressed yourself by the results..
3) Share with other photographs your'e will meet on your way,it's the best way to learn..