Adapter for Nikon d40 to mount a Cosina 75-300mm Macro lens?

I bought a Super Cosina Macro lens 75-300mm at a yard sale (didn't have my camera on hand to test the fit), & I've searched ebay for adapters that might allow the lens to be mounted to my Nikon d40. Minimal knowledge when it comes to adapters & mounting other lens brands.

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Blurry Photos with the 18-55mm lens?!

I'm a beginner Photographer,
I have Nikon D3100 and was doing indoor portraits with 18-55mm lens and A speedlite mounted on the hotshoe of the camera, The lightning condition inside the room was dark so i bumped up the power of the speed lite, they looked pretty good on the camera but when i viewed them on my desktop they were a little bit blurry. They didn't have much clarity as much as my 55-200mm has. What am i doing wrong here,
please help

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How to know which camera lense will fit my camera?

I have had a Nikon D40X and Recently both my lenses were broken (grrr children!) And so I need to invest in new ones.

How do I know a lense will fit my camera?

Also which type of lense would you recommend? I mainly use it to take photos of family parties and carnivals aswell as the occasional landscape/wildlife photo

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Why wont my dslr acsept a micro SD card with an adaptor?

i have a Nikon D3300 and i have a multitude of sd and micro sd cards and whenever i insert a micro sd card in an adapter a message appears on the screen saying "this memory card cannot be used. Card may be damaged. Insert another card" but the cards and adapters are real and work on my laptop and canon dslr.

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Which is the better camera? Nikon or Canon?

Which is the better camera? Nikon or Canon?

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My Nikon J1 keeps turning off?

Everytime I go to change the shutter speed/aperture/pop up the flash, lately it's just been shutting off. I'd have to take the battery out and put it on the charger for a few minutes, and then put the battery back in. It isn't that the battery is dead, and I don't know what to do. It is new and hasn't really been used that much. Should I just see about claiming a warranty (that hopefully my mom bought, don't know though.)

Has anyone else had this problem, and does anyone have suggestions as to how I should fix it?

Thanks. :)

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Have you used these lenses? Nikon, tamron, or sigma 70-200mm f2.8?

Have you used these lenses? Nikon, tamron, or sigma 70-200mm f2.8?
Added (1). I need a good 70-200mm f2.8 dx lens for a nikon body, I have hands on experience with the sigma version, but haven't used the tamron or nikon variants. I was wondering if you could offer any perks of either or compare them if you have used any or all of them.

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Is this flash good for my nikon d3200?

Is this flash good for my nikon d3200?

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Turn off red eye on d7000?

When I use a sb 900 flash it keeps doing like two mini flashes before the main one which I assume is for red eye. How ever I hate that as it makes me miss shots. How do i turn that feature off? Do I do it on the sb900 or so I do it on the nikon d7000? And how?

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Best Nikon professional camera?

What is the best professional camera to get? Looking into buying one anf wanna know an estimate of how much itll be?

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