The only reason I have ended up on this comparison between these DSLR cameras is that all the cameras, Pentax K 30, Nikon D5100 and Canon EOS 550 D lie in the same category.
If we talk about lens, then its pretty much close with the 16MP lens sensor of Pentax K 30 and Nikon D5100, whereas Canon 550D features 17.9 MP camera lens.
I have listed out the specifications in such a way that you can easily spot the similarities and differences between these cameras.
Canon EOS 550D features IFCL metering system and supports SDXC memory cards. And the fact that it lets you choose between Canon EF and EF S lens makes it a good option.
Nikon D5100 is basically an interchangable lens camera. With its speedy capability of high quality image capturing capability, D5100 is a great tool to a novice and a professional photographer.
If you want to something about Pentax K 30 which makes it a better camera than the other two listed below, then the fact that its weather sealed and lets you use in dust, cold weather, water makes it a perfect outdoor gadget.
Pentax K 30 vs Nikon D5100 vs Canon EOS 550D – Compare Specs
| Specifications | Pentax K 30 |
Nikon D5100 |
Canon EOS 550D |
| Camera Type | DSLR | DSLR | DSLR |
| Lens Sensor | 16 MP | 16.1 MP | 17.9 MP |
| Screen Size | 3 inch LCD screen | 3 inch LCD screen | 3 inch LCD screen |
| Flash |
Yes | Yes | Yes |
| Native Resolution |
4928 x 3264 | 4928 x 3264 | 5184 x 3456 |
| Dimensions | 130 x 97 x 71 mm | 127 x 96 x 78 mm | 129 x 98 x 62 mm |
| Weight | 650 grams | 560 grams | 530 grams |
| Battery | 410 shots | 660 shots | 440 shots |
| Video | 1080p @ 30 frames per second | 1080p @ 30 frames per second | 1080p @ 30 frames per second |
| ISO | ISO 100 – 12800 | ISO 200 – 12800 | ISO 100 – 12800 |
| Minimum and maximum shutter speed |
30 sec – 1/6000 sec | 30 sec – 1/4000 sec | 30 sec – 1/4000 sec |
| Best Price | $850 | $800 | $840 |