Best smartphones under 30000

The price band of Rs. 30000 will offer you a wide choice. I do not consider it to be a tough choice to make. That being a medium price range, your chosen device will definitely be outstanding with its performance.
Here are a few options though I cannot claim them to be part of any exhaustive list.

Moto X Force
With an AMOLED screen of 5.4 inch size, Moto X Force has a resolution of 1440 x 2560 pixels. It comes with an internal storage of 32 GB coupled with 3 GB RAM. You can expand the memory capacity by means of microUSB card. The device runs on Android Lollipop 5.1 and upgradeable to Android Marshmallow. You have access to 21 MP rear camera and a 5 MP front snapper. The battery capacity is 3760 mAh.

Price of the device is Rs. 26999 across different E Commerce sites.

One Plus 3
One of the latest to come from One Plus which once claimed itself to be Flagship killer, One Plus 3 runs on SAndroid Marshmallow. Recently the phone has received an update to Android Nougat. You have a 5.5 inch AMOLED screen at full HD resolution of 1920 x 1080 pixels. It comes with a 64 GB internal storage capacity with no expandable memory option. The unique selling point of the device is its whopping 6 GB RAM. You get a 16 MP rear camera along with a 8 MP front shooter. The battery capacity of OnePlus 3 reads 3000 mAh which should be efficient for a robust backup.
The phone is priced at Rs. 27999.

Huwawei Honor 8
Yet another device running on Android Marshmallow, it comes with 5.2 inch LTPS display at full HD display at 1920 x 1080 resolution. You have access to 32 GB of internal storage that can be expanded through microSD card. Coupled with it is 4 GB of RAM. The device comes with a 12 MP rear camera along with a 8 MP front camera. The battery capacity of Honor 8 reads 3000 mAh.
Price of the device is Rs. 29999.

Asus Zenfone 3
Asus Zenfone is a best choice for camera buffs. It was one of the phones that introduced laser auto focus. It is equipped with a 5.5 inch IPS plus screen at a resolution of 1920 x 1080 pixels. The internal storage of the device reads 64 GB that can be expanded further. It comes with a massive 4 GB of RAM. The phone has a 16 MP rear camera with f/2.0 aperture. For selfie lovers, it offers a 8 MP front snapper. The smartphone runs on Android Marshmallow. Asus Zenfone 3 has a battery capacity of 3000 mAh.
The phone is priced at Rs. 18999.

LeEco Le Max 2
It is one of huge screen devices at 5.7 inch. The quad HD display has a resolution of 1440 x 2560 pixels. The phone is equipped with an internal storage of 64 GB, but you will not be able to expand the memory any further. There is a huge RAM capacity of 6 GB. The rear camera on the device is an excellent 21 MP in resolution, while the front camera resolution reads 8 MP. The smartphone runs on Android Marshmallow. The battery capacity of Le Max 2 is 3100 mAh.
The price specified is Rs. 16999.

Xiaomi Mi 5
Xiaomi Mi 5 has a screen size of 5.15 inch and a full HD IPS display at 1920 x 1080 resolution. It has an internal storage of 32 GB and no expandable memory option. Coupled with it is 3 GB RAM. The Mi 5 runs on Android Marshmallow 6.0. You have access to a 16 MP rear camera and a 4 MP front snapper. The battery capacity on Xiaomi Mi 5 is 3000 mAh.
Price of the device is Rs. 32999.

Lenovo Z2 Plus
The device comes with a 5 inch super AMOLED screen at a full HD resolution of 1920 x 1080 pixels. The screen is protected by Corning Gorilla Glass. The device comes with an internal storage capacity of 32 GB, but there is no memory expansion option. The RAM capability reads 3 GB. The smartphone runs on Android Marshmallow 6.0.1. The device has a 16 MP rear camera and a 8 MP front shooter. The battery capacity of the smartphone is an impressive 3500 mAh.
The price of the device is Rs. 17999.

That is just a part of the possible options you have in the price bracket specified by you. I again would wish to state that the list is not exhaustive by any standard.

Here are some of the models under 30K with a good camera.

Xiaomi Mi Max

Xiaomi's phones have the best setup for photography. Be it low end or the high end phones, they have the lens calibrated such that it'd beat even the iPhone camera images. Xiaomi makes use of 16MP on almost every phone above 10K with PDAF and OIS support. And the Mi Max is no exception. If you use the phone without making changes to the device settings, even then you'd get better images. The device comes with Snapdragon 652 processor with 3GB RAM & 16MP primary camera along with 4G VoLTE support. Mi Max Prime and Mi Max, both of these devices have the the best lens that you can get under 30K. The Mi Max is priced at 14,999 Rs and Mi Max Prime at 19999 Rs. If you wish to get any phone for purely photography then this is the model I'd suggest.

OnePlus 3

OnePlus series has some of the good phones for photography but they have good autofocus lenses from Sony. Oneplus 3 is no exception to this feature. It has 16MP lens with autofocus. It's PDAF and OIS gives some of the quality image output. The device has Qualcomm Snapdragon 820 SoC with 6GB RAM. This is second most device I'd prefer for photography. It has 5.5 inch AMOLED screen with 64GB storage. The device is priced at 27999 Rs.

Lenovo Z2 Plus

Lenovo's Z2 Plus is another phone that has a good camera. The device has Qualcomm Snapdragon 820, 4 custom Kryo cores, 2.15Ghz speed. It has 8MP Front facing Camera with good PDAF lens. Phone has 5 inch LCD capacitive touchscreen display with square edged design. It has Android Marshmellow and may get an new nougat update soon. The device is priced at 19,999 Rs. on Amazon.

Moto Z

Moto's Z has one of the good camera lens. And the best part about this phone is that it's price is under 30K. The device has 2 GHz Octa-Core Qualcomm Snapdragon 625 processor with 3GB RAM and 64GB capacity. In terms of performance and everyday usage, the phone is good. Also for photography, the device has good camera lens with 16MP and 5MP wide angle front camera with display flash. The device is priced at 24,999 Rs on Amazon.

Nextbit Robin

Nextbit's this model has some of the jam packed features. It has IPS Display, Gorilla Glass 4 with 5.2 inch display. It has Qualcomm Snapdragon 808 MSM8992 with 1.8 GHz processor. In terms of design it has a nice square design. It has 3GB RAM and 32 GB storage. And the best part is it has a good camera lens with 13MP primary camera. The device has the price 19,999 Rs. on Flipkart.

These are some of the good models under 30K with good camera. I'd say stick with Android phones. Though you can buy old iphone 6S under 30K too. But it won't be much of a good purchase considering the same features you get from Android Models.

Under 30,000 few models work awesome in its features. Some of them would be preferable for flexible working.

OnePlus 3
OnePlus models have better features in the market industry. It has created revolution in the Smartphone industry. It has 5.5 inches of its display size. It comes with dual sim functionality. It also has 4G connectivity for better speed. The Core 2.15Ghz & Dual Core 1.6Ghz Kryo Snapdragon 820 comes as the processor in this model. The massive store area in this model has 6GB of RAM and 64GB of internal storage for greater memory speed and functionality. There is no external slot in this model. The latest android 6.0 version of operating system runs with this model. There is also good quality camera having 8MP in front side and 16MP in rear side. The bigger battery of 3000mAh gives good enough power to the phone. The overall weight of this model is 158g. The price of this model is slashed at Rs. 27,999.

LeEco Le Max 2
LeEco models have been raising its users by its attractiveness and better features in the market. It has 5.7 inches of its display size. It comes with dual sim functionality. It also has 4G connectivity for better speed. The Dual Core 2.1Ghz & Dual Core 1.6Ghz Kryo Snapdragon 820 comes as the processor in this model. The greater store area in this model has 4GB of RAM for awesome memory speed and 32GB of internal storage for better user functionality. There is no external slot in this model. The latest android 6.0 version of operating system runs with this model. There is also good quality of camera having 8MP in front side and massive 21MP in rear side. The battery is of 3100mAh providing ample power support. The overall weight of this model is 185g. The price of this model is slashed at Rs. 17,999.

Honor 8
Honor models have been raising its number of users by its stylish looks and greater features in the market. It has 5.2 inches of its display size. It comes with dual sim functionality. It also has 4G connectivity for better speed. The Octa Core 4x2.3Ghz Cortex A72 & 4x1.8Ghz Cortex A53 Kirin 950 comes as the processor in this model. The storage area in this model has 4GB of RAM for awesome memory speed and 32GB of internal storage for a handful of functionality. There is an external slot in this model. The latest Android 6.0 version of operating system runs with this model. There is also good quality camera having 8MP in front side and 12MP in rear side. The battery is of 3000mAh capacit. The overall weight of this model is 155g. The price of this model is slashed at Rs. 29,990.

Samsung Galaxy A7
Samsung models are vast in numbers with different features. It was famous for its flexi use and stylish looks. This model has 5.5 inches of its display size. It comes with dual sim functionality. It also has 4G connectivity for better speed. The Octa Core 1.6Ghz Cortex A53 Exynos 7580 comes as the processor in this model. This model has a 3GB of RAM for better memory speed and 16GB of internal storage for faster user functionality. There is an external slot in this model. The latest Android 6.0 version of operating system runs with this model. The camera is having 5MP in front side and 13MP in rear side. The battery has a 3300mAh capacity. The overall weight of this model is 169g. The price of this model is slashed at Rs. 25,990.

Nexus 5X
Nexus models are fast developing with latest models in the retail market. It has 5.2 inches of its display size. It comes with single sim functionality. It also has 4G connectivity for better speed. The Quad Core 1.4Ghz Cortex A53 & Dual Core 1.8Ghz Cortex A57 Snapdragon 808 comes as the processor in this model. The storage area in this model is having 2GB of RAM and 32GB of internal storage for better memory speed . There is no external slot in this model. The latest Android 6.0 version of operating system runs with this model. The camera is having 5MP in front side and 12MP in rear side. The battery is of 2700mAh . The overall weight of this model is 136g. The price of this model is slashed at Rs. 25,590.

As per your enquiry I have jotted down 5 phones that have their focus on Camera and are priced below Rs.30000. I have mentioned only the camera features and not the other specifications, so that you can find them easy to choose.

1. Moto X Force
This phone is having a 21MP primary camera and 5MP front facing camera with a support of dual LED flash. It has excellent camera featues like 4x digital zoom, drag to focus and exposure, night mode, burst mode, auto HDR, panorama, video stabilization.

Price: Rs.26,999.00

2. HTC One E9 Plus
This model from HTC One has a 20MP primary camera nd ultra pixel front facing camera with features like auto focus, BSI sensor, video recording.
Price: Rs.27,000.00

3. Xiaomi Mi 5
The Xiaomi Mi 5 model is renowned for its high end camera functionality. The Primary camera is of 16 MP while its Secondary camera is of 4 MP. The phone has got some exclusive camera features like PF-AF with dual-tone dual-LED Flash, OIS and more.
Price: Rs. 25,000

4. OnePlus 3
Among all others , OnePlus 3 has given more power to its cameras. The phone has a Primary camera of 16 MP and tthe Secondary camera is of 8 MP with latest standard features enabled, like PDAF OIS with LED Flash and more.
Price: Rs. 27,999

5. Moto Z Play
Motorola had always given the best performance for every aspect including cameras. This particular model is having a 16 MP dual autofocus camera in its rear and 5 MP front camera with display flash. The cameras are supported with laser focus & PDAF along with the feature of color balancing and dual LED flash. It is capable for 4K video recording of 30 fps as well.
Price: Rs.24,999.00