It only took me 4 months, but I FINALLY saved up enough money to buy a battery grip for my K-7. A recent incident prompted me to hurry up my savings; a few days ago, we finally got a single gorgeous day amidst lots of ugly days, so I took out my bike and went for a ride. 6 shots into the session, the #$%#&!@ proprietary battery died because I ONCE AGAIN forgot to charge it. At that moment, I vowed that I'd get a battery grip and never suffer the same fate again. My shooting session was ruined at this point, and I was too bitter to continue riding, so I just went home. I put the battery in its charger (almost forgot again) and waited the interminable 6 hours... by which time the sun was gone. Meanwhile, I re-arranged our budget so that a battery grip would be possible sooner.
I briefly considered buying one of the many clones available on eBay. I've read lots of positive reviews about them, and they're really affordable. But the lack of weather resistance was a deal breaker for me. I've been taking my camera into some crazy conditions since I got it, and I don't much like the idea of having water seep into the battery compartment and short something out. With this in mind, a genuine Pentax grip was the only option, and that meant saving for a little while longer.
I received my new battery grip from Amazon yesterday (I even saved enough money for 2-day shipping). At 270 grams without batteries, it already adds over half a pound to my camera's weight. This is unfortunate since I always try and minimize the weight I carry when I'm biking. After I added 6 Sanyo Eneloop batteries, the weight climbed up to 425 grams, which is almost a full pound! Considering this, I'll probably want to remove one of the lenses from my bag to compensate. When you're mountain biking on rough trails, every gram counts. I already thought my bag was heavy enough...
Attaching the grip to the camera was simple as can be. I especially appreciate the built-in compartments for the contact covers, which makes it less likely that I'll lose those. The weather-sealing around those contacts is also a nice touch. It's unfortunate that they weren't able to add an SD card holder in the AA tray, especially since there's one in the alternate tray, but I guess 6 batteries takes up a lot of space. For some reason, I was under the impression that the battery grip should have a place to store the Pentax Remote F, but it does not.
The grip and the batteries I used. Note the compartment to store the contact caps from the grip and battery, over on the left side.
When looking at battery grips for other cameras, I noticed many of them have a massive "pole" that goes into the camera, presumably into the battery compartment. I like the fact that this battery grip doesn't have that. This makes it easier to store in my camera bag when it's off the camera.
My first impression when the grip was attached to the camera: my K-7 is finally complete. It's like my camera was always missing a part of itself, and now it's whole. My right pinky finger falls naturally into its groove in the grip instead of curling back into the palm of my hand. Everything feels much more stable. There's noticeably less camera shake when hand-holding. The whole thing feels like a stable hunk of quality.
I love the ergonomics of the camera with the grip attached
My second impression: my camera weighs a lot more than it used to. My camera with D-LI90, memory card and neck strap (but no lens) just went from 825 grams to 1250 grams! That's still lighter than many other cameras out there, but it's a big difference for the K-7. Luckily, my Op/Tech USA neck strap prevents my neck from feeling over-burdened, and it hasn't affected the portability of the camera. I just went on a 3 hour-long shooting session yesterday using many different lenses, and my neck never got sore.
Another nice benefit; larger lenses are better balanced with this setup. When I had the DA* 50-135mm on there, it felt perfectly balanced and proportioned. Granted, the DA*50-135mm is well balanced on the K-7 even without the battery grip present, but even more so with a battery grip. Also, when the whole camera assembly is hanging from my neck with the DA* 50-135mm, the lens stays pointed forward instead of drooping down. This prevents accidental impacts on the handlebars when I'm walking my bike, especially when the hood is mounted pointed forward.
The DA* 50-135mm looks far less overwhelming when the grip is present
The added controls on the grip are a nice bonus. It's great to have all those commonly-used buttons and dials at my fingertips when using the camera in portrait mode. Also, the camera assembly is perfectly shaped so it feels exactly the same regardless of its orientation. My fingers fall naturally into their respective grooves and everything is very comfortable. I do have one issue with the controls though: the front e-dial feels exactly like the one on the camera, but the rear one is recessed a bit. This is probably on purpose to avoid turning it by accident when we change orientation, but it makes it a bit harder to use.
One major gripe I have is with the new location for the tripod mount. It's no longer in line with the lens focal point, but off towards the right instead. I don't particularly care about the lens focal point itself, but by placing the tripod mount this way, the camera assembly is now even more unbalanced on my light travel tripod, especially when I have a heavy lens mounted. Using a large telephoto lens is exactly when I'd be more likely to need a tripod in the first place. I don't understand why it was necessary to do this. The whole camera assembly with a DA* 50-135mm weighs almost exactly 2 KG (4.4 pounds), which is the exact limit of my travel tripod. But since it's now a heavily unbalanced weight, this makes the tripod less stable than I'd like. As a result, my travel tripod has been relegated to low-angle use, close to the ground and with legs splayed wide. Or, I can remove the battery grip before using my travel tripod, but this involves unscrewing the battery grip and then screwing on the tripod mount, and then the reverse for when I want to put the battery grip back on. It's a pain. I almost wish I could put a tripod mount on my lens instead.
Why? WHY?
Overall, my verdict is extremely positive. I love the feel of my K-7 with a battery grip attached, and I love the new-found stability. I also love the way lenses are more balanced now, and the fact that the added weight hasn't affected my neck (thanks to the Op/Tech USA neck strap). The added controls are an excellent bonus, and the design of the storage compartments for the contact caps is brilliant. Most importantly, I can use any AA batteries now when I forget to recharge the lithium ion battery. I always have a bunch of AA's ready to go, and I can buy AA's at any convenience store.
On the other hand, I regret that the added weight means I'll probably leave one more lens behind when I go biking. And I really hate the location of the tripod mount... what's the point of doing that when they make a clear effort to place it at the center of the lens on the camera?
I'm very pleased with my purchase and only regret not getting the battery grip sooner. I hope this review helps someone else who's debating whether to get one!