How much zoom is 55 250mm

The lens is supplied with end caps but no lens hood. A lens hood ET and lens case LP are available as optional accessories. The two lenses have similar optical constructions and identical close focusing points, although the mm lens is marginally slimmer and 80 grams heavier and its barrel extends about 8 mm further at full zoom extension.

In our user tests it was a good match of the EOS D but felt slightly less comfortable on the heavier 40D body. Moving from the 55mm position to the mm position required roughly a quarter of a turn and we found the markings on the lens barrel corresponded very well with the actual focal length settings.

When zooming from the 55m position to the mm position, the lens barrel extends by 62 mm and the front element rotates. This makes using angle-critical attachments like polarisers and graduated filters difficult.

No zoom lock is provided — and none is required as the review lens showed no tendency to slide when carried pointing downwards. The focusing ring also moves through about a quarter of a turn but is only usable when MF has been selected on the lens.

Autofocusing speeds were good for a lens of this speed, even in low-light conditions. AF noise was relatively low. Performance The low price of this lens is reflected in some aspects of the optical performance of the review sample. Like most zoom telephoto lenses reaching beyond mm, this lens has a variable max aperture.

Ideally, larger focal length numbers are in the left-most columns of the chart, indicating wider apertures available at longer focal lengths. In this chart, we see that the STM ranks near last place in terms of max aperture available at focal lengths.

Image stabilization adds significantly to a narrow aperture telephoto lens' usefulness. I find IS to be a huge advantage when handholding a lens. Helpful especially to movie audio recording is that this IS implementation is essentially silent. The difference between properly framing a subject at a narrow angle of view such as mm with IS on and with IS off is like night and day. This results in less framing correction via cropping in post processing — which reduces image resolution and costs you time.

You will notice the effects of image quality in your results. Because this lens is so light, I find it hard to hold rock still an inertia issue — and this effects my handheld image sharpness overall.

The 3. At mm, hand shake is significantly magnified. Again, in the field, I needed a significantly faster shutter speed for good results. Image stabilization does not negate the need for a tripod in all situations and a tripod is always preferred when a situation permits use of such. Canon says that image stabilization should be turned off when using a tripod and their reason for this advice is to save battery power.

While the battery consumption difference is generally of little regard to me, I can tell you that this lens frequently delivers very blurred images with IS enabled while tripod mounted. Also of concern is that the subject framing changes slightly when IS is active, leaving you with a potentially misaligned image. The manual recommends leaving IS enabled with monopod use. Image quality has easily been the biggest drawback for me to recommend Canon's mm lenses.

These lenses just haven't been very good performers — especially at the upper end of the FLR. And perhaps the most notable feature of this lens is the image quality it delivers. Use the site's image quality tool to see the difference for yourself. The improvement can be seen in the center of the frame and the difference in the corners is dramatic.

See this difference in the image quality tool. With a narrow max aperture, getting good image quality wide open becomes especially important. This sharpness improvement is a big deal — this lens is delivering impressive image sharpness for the price. The parts of your image that are not sharp also matter and a blurred background is accomplishable with this lens, though primarily at the longer focal lengths. The quality of that background blur bokeh then becomes important.

This lens has a rounded 7-blade aperture. While I have not encountered horrible bokeh overall with this lens, it is not the best performer in this regard. I primarily don't care for the bright concentric rings around the specular highlights in the examples above. Expect about 1. Of course, APS-C format camera owners are used to seeing no noticeable shading from their full frame compatible lenses — even with wide open apertures.

The above Susquehanna River panorama was captured handheld at 55mm in horizontal orientation using a circular polarizer filter. Photoshop was used to merge the multiple images.

The biggest difference is that the STM has. The amount of CA reduces until being very low at mm. CA again becomes noticeable at mm and becomes moderately strong from through mm. You can see the CA in the mm test image below. There should be only black and white in this image the color of the chart. Reply to thread Reply with quote Complain. If you look at the announcement of the Pentax Optio M90 on the front page it says "a zoom range equivalent to 28mm to mm", To get the "35mm equivalent focal length" for a crop-DSLR, e.

Reply Reply with quote Reply to thread Complain. Good answer from raincat, just wanted to add to it. Lemming51's gear list: Lemming51's gear list. F Forum M My threads. Latest sample galleries.

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