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Other lenses to consider:

• SMC Pentax DA 18-135mm F/3.5-5.6 ED AL IF DC WR. More versatile than your current lens. Should have better image quality than a superzoom because of less extreme zoom range. It's weather sealed, if that's important to you.

• Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM C. Comparing test images from Canon version, appears sharper than Tamron. Seems to be available for Pentax mount.

• Old Pentax manual focus lenses. They are inexpensive and should be usable with your camera because many use an older version of the same mount. The older coatings are also still very good.

As for the other lenses in your list:

• Rokinon FE8M-P 8mm F3.5 Fisheye. Fisheyes are a lot of fun, but may get used infrequently.

• Pentax DA 35mm F2.4. Its focal length is basically already covered by your 18-55 zoom, and it's only about a stop faster.

  If it does not have significant differences from your existing lens, there is a good chance it won't get used. For me to use a prime, it must have significant differences from my zooms – focal length, aperture, or "look".

• Something in the 70-300mm range. The range you specify is a bit large. A 70-200mm will likely have better image quality.

  Also, at any given moment, there is a good chance you will have the wrong lens on your camera. You have to constantly be looking ahead to what lens you will need next. To ease the transition between switching lenses, I like to have overlapping zoom ranges. Also, consider keeping a compact camera in your pocket.

Other lenses to consider:

• SMC Pentax DA 18-135mm F/3.5-5.6 ED AL IF DC WR. More versatile than your current lens. Should have better image quality than a superzoom because of less extreme zoom range. It's weather sealed, if that's important to you.

• Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM C. Comparing test images from Canon version, appears sharper than Tamron. Seems to be available for Pentax mount.

• Old Pentax manual focus lenses. They are inexpensive and should be usable with your camera because many use an older version of the same mount. The older coatings are also still very good.

As for the other lenses in your list:

• Rokinon FE8M-P 8mm F3.5 Fisheye. Fisheyes are a lot of fun, but may get used infrequently.

• Pentax DA 35mm F2.4. Its focal length is basically already covered by your 18-55 zoom, and it's only about a stop faster.

  If it does not have significant differences from your existing lens, there is a good chance it won't get used. For me to use a prime, it must differ from my zooms in focal length and either aperture or "look".

• Something in the 70-300mm range. The range you specify is a bit large. A 70-200mm will likely have better image quality.

  Also, at any given moment, there is a good chance you will have the wrong lens on your camera. You have to constantly be looking ahead to what lens you will need next. To ease the transition between switching lenses, I like to have overlapping zoom ranges. Also, consider keeping a compact camera in your pocket.

Other lenses to consider:

• SMC Pentax DA 18-135mm F/3.5-5.6 ED AL IF DC WR. More versatile than your current lens. Should have better image quality than a superzoom because of less extreme zoom range. It's weather sealed, if that's important to you.

• Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM C. Comparing test images from Canon version, appears sharper than Tamron. Seems to be available for Pentax mount.

• Old Pentax manual focus lenses. They are fairly inexpensive and should be usable with your camera because many use an older version of the same mount. The older coatings are also still very good.

As for the other lenses in your list:

• Rokinon FE8M-P 8mm F3.5 Fisheye. Fisheyes are a lot of fun, but may get used infrequently.

• Pentax DA 35mm F2.4. Its focal length is basically already covered by your 18-55 zoom, and it's only about a stop faster.

  If it does not have significant differences from your existing lens, there is a good chance it won't get used. For me to use a prime, it must have significant differences from my zooms – focal length, aperture, or "look".

• Something in the 70-300mm range. The range you specify is a bit large. A 70-200mm will likely have better image quality.

  Also, at any given moment, there is a good chance you will have the wrong lens on your camera. You have to constantly be looking ahead to what lens you will need next. You may still miss shots when something unexpected happens. To ease the transition between switching lenses, I like to have overlapping zoom ranges. Also, consider keeping a compact camera in your pocket.

Other lenses to consider:

• SMC Pentax DA 18-135mm F/3.5-5.6 ED AL IF DC WR. More versatile than your current lens. Should have better image quality than a superzoom because of less extreme zoom range. It's weather sealed, if that's important to you.

• Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM C. Comparing test images from Canon version, appears sharper than Tamron. Seems to be available for Pentax mount.

• Old Pentax manual focus lenses. They are inexpensive and should be usable with your camera because many use an older version of the same mount. The older coatings are also still very good.

As for the other lenses in your list:

• Rokinon FE8M-P 8mm F3.5 Fisheye. Fisheyes are a lot of fun, but may get used infrequently.

• Pentax DA 35mm F2.4. Its focal length is basically already covered by your 18-55 zoom, and it's only about a stop faster.

  If it does not have significant differences from your existing lens, there is a good chance it won't get used. For me to use a prime, it must have significant differences from my zooms – focal length, aperture, or "look".

• Something in the 70-300mm range. The range you specify is a bit large. A 70-200mm will likely have better image quality.

  Also, at any given moment, there is a good chance you will have the wrong lens on your camera. You have to constantly be looking ahead to what lens you will need next. To ease the transition between switching lenses, I like to have overlapping zoom ranges. Also, consider keeping a compact camera in your pocket.

Other lenses to consider:

• SMC Pentax DA 18-135mm F/3.5-5.6 ED AL IF DC WR. More versatile than your current lens. Should have better image quality than a superzoom because of less extreme zoom range. It's weather sealed, if that's important to you.

• Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM C. Comparing test images from Canon version, appears sharper than Tamron. Seems to be available for Pentax mount.

As for the other lenses in your list:

• Rokinon FE8M-P 8mm F3.5 Fisheye. Fisheyes are a lot of fun, but may get used infrequently.

• Pentax DA 35mm F2.4. Its focal length is basically already covered by your 18-55 zoom. If it does not have significant differences from your existing lens, there is a good chance it won't get used. For me to use a prime, it must have a significantly different "look" from my zooms. If I cannot look at an image and instantly know it was shot with a different lens, there is no point of going through the trouble of changing lenses.

  For low light, look for something F1.8 or faster. With good image stabilization, 1-2 stops may not be significant enough to matter.

• Something in the 70-300mm range. At any given moment, there is a good chance you will have the wrong lens on your camera. When using multiple lenses, you have to constantly be looking ahead to what lens you will need next. You may still miss shots when something unexpected happens. Consider keeping a compact camera in your pocket.

Other lenses to consider:

• SMC Pentax DA 18-135mm F/3.5-5.6 ED AL IF DC WR. More versatile than your current lens. Should have better image quality than a superzoom because of less extreme zoom range. It's weather sealed, if that's important to you.

• Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM C. Comparing test images from Canon version, appears sharper than Tamron. Seems to be available for Pentax mount.

• Old Pentax manual focus lenses. They are fairly inexpensive and should be usable with your camera because many use an older version of the same mount. The older coatings are also still very good.

As for the other lenses in your list:

• Rokinon FE8M-P 8mm F3.5 Fisheye. Fisheyes are a lot of fun, but may get used infrequently.

• Pentax DA 35mm F2.4. Its focal length is basically already covered by your 18-55 zoom, and it's only about a stop faster.

  If it does not have significant differences from your existing lens, there is a good chance it won't get used. For me to use a prime, it must have significant differences from my zooms – focal length, aperture, or "look".

• Something in the 70-300mm range. The range you specify is a bit large. A 70-200mm will likely have better image quality.

  Also, at any given moment, there is a good chance you will have the wrong lens on your camera. You have to constantly be looking ahead to what lens you will need next. You may still miss shots when something unexpected happens. To ease the transition between switching lenses, I like to have overlapping zoom ranges. Also, consider keeping a compact camera in your pocket.