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Showing all 3 reviews by PTCLG

Review of: Vivitar (Kobori) 28-105mm F3.5-4.5 by PTCLG on Wed November 26, 2014 | Rating: 8 View more reviews 
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Views: 48458
Reviews: 4
I got one of this kind of lens last week. It cost me $41 include postage after a negotiation. I would like to give it an overall rate between 8~9, mostly 8.5 or 8.6. A complete information about this lens may be: Vivitar Series 1 28-105mm F/2.8-3.8, Filter size 72mm, P/K mount with "A" mark on the aperture ring Yes, it is the version of filter-size in 72mm, which has been commented as worse by some people worldwide. I was also disappointed at the first with it since the pictures were sometimes blur and very bad just like what the other peoples have said. But today I finally found a problem of this lens. It is the focusing issue and is very easy to be corrected. The issue is that it may give me twice confirmations when I turn the lens to focus on an object. One is true and correct and the other is false and wrong. With my experiences, when I turn the lens from right to left to focus an object, it gives me a confirmation at a "shorter" distance from the object, so the picture is blur, but when I turn the lens from left to right, it will focus in an exact distance and produce a very sharp picture. I did in many times to make sure my judgment is right. I even posted several photos onto a forum in a Chinese society. I also created a picture to show the evidence of the twice confirmations of the focusing issue. The website link is as blow: http://www.mitbbs.com/article_t/PhotoGear/35092323.html Although you might not be able to understand the Chinese texts in the website, you can see a complete information of the lens, all the pictures taken by it and the relevant photographing parameters. You can even find the environment, i.e. sunny, breeze, tripod, ISO, focal, exposure, aperture, etc., from the texts and title of each picture. So now, in my opinion, this lens is a good lens, not a bad one. You can see the IQ is very good even in the wide open of the aperture 2.8 at the Focal 105mm, and the color rendition is very nice. Of course the bokeh is amazing, too. Especially when worked with its macro, even under f/11, the bokeh is still very good in outdoor photographing since it has a very short distance to the object (I guess it is less than 0.5 meter). I also tested its focal 28mm, the IQ at f/2.8 is acceptable to me, and sharp enough at f/4, but very sharp at f/5.6. However, the bokeh is bad due to the closest distance is 1.5 meters. I would like to recommend this lens strongly if the price is around &100, but it might be worth to have it as a collection if the condition is mint and the price is under $200. Good luck!! [LEFT] [/LEFT]

Review of: Vivitar Series 1 Version 3 (komine) 70-210mm F2.8-4 by PTCLG on Sat May 17, 2014 | Rating: 9 View more reviews 
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Views: 106139
Reviews: 21
I got this lens 3 years ago and love it very much. 4 pictures in the following link were taken by this lens on Pentax K20D. http://www.mitbbs.com/article_t/PhotoGear/35095093.html I also made a comparison among Vivitar Series 1 28-105mm f/2.8-3.8 Version at filter size 72mm This lens: Vivitar Series 1 70-210mm f/2.8-4.0 Macro, filter size 62mm, version 3 Canon EF 24-70mm f/2.8L I at the focal 70mm with various apertures and found this lens is the best in this comparison. The comparison is in the following link,and the order in that post is as listed above in this post. http://www.mitbbs.com/article_t0/PhotoGear/35093145.html

Review of: Vivitar Series 1 VMC Macro Focusing Zoom 28-105mm F2.8-3.8 by PTCLG on Sun April 27, 2014 | Rating: 9 View more reviews 
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Views: 82194
Reviews: 9
I got one of this kind of lens last week. It cost me $89 include postage. A complete information about this lens may be: Vivitar Series 1 28-105mm F/2.8-3.8, Filter size 67mm, P/K mount with "A" mark on the aperture ring Yes, it is the version of filter-size in 67mm, which has been commented as very good by some people worldwide. I was very satisfied at the first with it since the pictures were very sharp and clear. This is a very good manual lens. I will upload some pictures taken with this lens, and you can see the image quality (IQ) is very good even in the wide open of the aperture 2.8 at the Focal 105mm, and the color rendition is very nice. Of course the bokeh is amazing, too. Especially when worked with its macro, even under f/11, the bokeh is still very good in outdoor photographing since it has a very short distance to the object (I guess it is less than 0.5 meter). I also tested its focal 28mm, the IQ at f/2.8 is acceptable to me, and sharp enough at f/4, but very sharp at f/5.6. However, the bokeh is not good enough under some specific situations due to the closest distance is 1.5 meters. I would like to recommend this lens strongly if the price is around &100, but it might be worth to have it as a collection if the condition is mint and the price is under $200. Good luck!!



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