The first SLR camera I bought when I was a student in the 1970s was a Pentax K1000 - built like a brick, fully manual everything with a mechanical shutter and could run battery free, albeit without metering. I survived a while with just one lens, 50mm f1.7, but soon started to expand the lens collection. When I bought my next camera body it was necessarily a Pentax so I could retain the growing suite of lenses. I am now on my 10th camera body (4th digital) and can still use all of the lenses in my collection.

My normal field kit (for landscapes and wildlife) consists of:

Pentax K3 + BG-5 Battery Grip
Faster focus, more fps and 24MP sensor were too much to resist.
Pentax K5 + BG-4 Battery Grip
The old work-horse has now been put out to pasture as the backup camera.
Sigma 10-20 mm f/4-5.6 DC
Nice, sharp ultra-wide zoom
Pentax 16-50 mm f/2.8 ED AL(IF) SDM DA*
Once I had this lens in my hands I 'just had to have it'. 
Tamron SP 90 mm f/2.8 Macro
Beautiful lens - light, fast focussing and super-sharp
Tamron SP 70-200 mm f/2.8 LD (IF) 
The old 28-200 was handed down to my son with the K-20d camera and replaced with this one. Much larger and heavier but I love the f/2.8 and it's seriously sharp.
Sigma 300 mm f/2.8 EX DG
Most frequently used with dedicated Sigma 1.4x or 2.0x tele-converter
Lowepro PhotoTrekker AW
This backpack takes all of the above including cameras, lenses and the usual paraphernalia of battery chargers, toolkits and tripod mounts along with room for a few muesli bars and binoculars (although they are usually hanging around my neck...the binoculars, not the muesli bars)
Lowepro Sling
This is great for throwing over the shoulder to carry an extra lens or two and a bottle of water while walking with tripod, camera and 300 lens over shoulder (and leaving the backpack in the car!)
Manfrotto 055X PROB legs + MH055M0-Q5 ball head with Quick Release Plate
This is my second 055 tripod and I love it. It is (relatively) lightweight but sturdy and, with ball head, the full leg extension puts the camera at eye height. In addition, the legs can splay out to wider angles allowing quick height adjustment and support in difficult terrain or when "getting low" to stalk wildlife; and the centre pole swivels to horizontal making difficult to access macro shots much easier
Jobu BWG-HD3 gimbal head
Better balance and flexibility than the ball head for the 300 with x2 adaptor. 
Metz Mecablitz 58 AF-2
A recent addition to the kit, replacing the 28 year old Metz potato masher
Better Beamer Flash Extender
This great little accessory fits onto the front of the flash and focusses the flash beam through a Fresnel lens, increasing the flash output by 2-2.5 stops
Getting there can be half the fun and it's amazing how close you can get to some birds if you don't get out of the car so this is a recent photographic accessory :-)

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