Vibrance

Very bright and vivid all color.  Excellent scene.  Best Regards,

Hi Sankha,

This is a colorful scene display from Nature.

However, I do see a reduced clarity level.

Here are some of the possible reasons:

1] At full zoom, using F/6.3 is good for most zooms like what you have. However, the zoom level used can easily be compromised by the design for subjects that are nearer to you than for subjects at Infinity (where most zooms are better corrected).

2] The fact is that the zoom ratio is large, being that an 18 mm -270 mm zoom is covering a 15: 1 range. In my many years of experience testing most every zoom lens made, including this lens, the performance level is compromised from that of a shorter range zooms like 5:1 or less, and further compromised from a good fixed focal length lens.

3] There could have been some vibration (like hand shake) that caused a small amount of blur. This can easily happen at higher zoom magnifications. Even with an Image Stabilized lens, blur can occur because the circuits do not always compensate properly.  

4] The point of focus might be off. If you used autofocus, this is not uncommon. Manual focusing assures that the point of focus selected will be maintained during the shot.

5] The zoom setting could also be compromised by a mechanical issues that often is associated with many zooms using many optical elements. A zoom lens rarely repeats it set point, and in some cases , the smallest amount of misalignment of one of the elements can result in image quality loss.  

6} I would take some images at 270 mm without using the UV filter in place., Often, a filter with poor optical quality can reduce the performance level of any lens, especially at longer focal length settings. I test thousands of filters yearly, I find a great number of them not suitable for my fixed and zoom lens that I use in the lab or in the field.

Best Regards, Mike

great colors very beautiful work congrats gerolamo

Thanks Wanghan, Mike and Gerolamo.

@Mike: Thank you for explaining that to me. I was initially excited about the 18-270 after I bought it. But I have also noticed that it does not perform well at its highest focal length. So it may be the lens or it may be me, I should have used a tripod. Also there was wind. So that probably explains the small amount of blurriness. 

However, I was completely unaware that this could be caused by the UV filter. I will now try the 270 mm focal length without the UV filter. While buying a UV filter for this lens, I did notice that there were quite a few options, with different prices. I chose a filter which was moderately priced. Do you have any suggestions as to what to look for when buying filters?