I tried AF and M but can't get any combination to focus

The set I bought are made for Nikon and support AF.

I have some Kenko extension tubes that I was trying to use in conjunction with my Nikon 70-300mm lens and I can not get it to focus in any mode I try. I use a D90 camera. Any suggestions?
Thanks

What's a DIY?

You might want to check the buy/sell forum. There are always folks who are trying to move up into the higher end models and looking to sell what they have to help defray some of their costs. Just a thought.

I bought some silica gel in what's called "pillow paks" on line and put a cell phone in with them for a week turning it over every couple days. It has been working fine for three months. The pillow paks will keep anything from getting into the camera so you would be able to open it up as much as possible.

It better be the best at $500.00!

Thanks to all but it sounds like there's a lot more involved than what I has imagined. I think I'll just stick with having my B&W developed for me. I don't do a lot anyway but I still enjoy shooting with my old Minolta on occasion. I use my D90 probably 95% of the time.
Thanks again,
Pepper

I just thought if it wasn't too expensive it might be fun to mess with.

I should have mentioned that I only use B&W film.....can't find it anywhere locally !! Too bad ![/quote]

I buy it online, available at many sites.

[quote=usaellie101]
That last line about thank you for the darkroom thought... is not my quote but you've made it look as though it is by putting my name under it,,,not cool.

Newbie here, what's and AEO unit?

[quote=Brucej67]I do B&W film and develop it myself then scan it into the computer. My estimated cost for development comes to $2 for a role of 120mm.


I have an old Minolta Maxxum 7000 that I still use for B&W mostly because I have an emotional attachment to that camera. Can you give me an idea of what kind of money it would take to set up a dark room just to do B&W and also what kind of learning curve one would have to deal with?
Thanks,
Pepper

Post Processing

You’re a business person, figure out what you want to make an hour. Assume you’ll have 2000 hours over the course of the year to bill and spread your equipment and travel expenses over those hours and add the cost to your hourly rate. Figure what you’ll need for insurance, taxes and maintenance and any other incidentals total it up, divide by 2000 and add that to your rate. Don’t just start low thinking you can just raise your prices later it rarely works that way. Assume you’re worth your price and then go sell yourself. JMHO of course.