2015

Staff Blog

Archive '2015'

img:Review of Kenko Mirror Lens 400mm F8
Aug 30, 2015

Review of Kenko Mirror Lens 400mm F8

By Marina Stepanenko, Vido http://vido.com.ua/article/6667/obzor-zierkal-no-linzovogho-obiektiva-kenko-400mm-f8/ This kind of lenses has its origin in astronomic telescopes and in 1970-th was very popular due to its compact construction and low price. This time as a object of review we take modern representative of catadioptric (or mirror) system lens - Kenko Mirror Lens 400mm F8. Lets take a close look. If we look inside Kenko Mirror Lens 400mm F8 we may find system of mirrors that helps radically to reduce the size of the lens comparing with classic optical lens: 400mm F8 from Kenko weights approximately 500g, while other 400mm analog with classic optical system will be not less than 1.5 kg and have corresponding size. Simple optical construction gives another advantage - low chromatic aberrations. Chromatic aberrations usually appear in tele lenses. To minimize these aberrations venders use lenses made of low dispersion glass, that as a result bumps the costs and the price of the product. Kenko Mirror lens 400mm F8 is compact and lightweight, but the price for these 2 important and attractive features is F8 that is cannot be changed. Light volume can be controlled by 67mm size neutral density filters, ISO or shutter speed. Focusing is realized only in manual mode and that is the standard for mirror lens except discontinued Sony SAL 500 f8 Mirror. Kenko Mirror lens 400mm F8 that adopts T-mount mounting standard can be used with almost every camera using T-mount adapter. In our case lens was tested on Micro Four Thirds mount camera with crop-factor 2x, so the lens had focus length equivalent to 800mm lens on full frame. With T-mount for Micro Four Thirds Ergonomics Lens has a big wide focusing ring with ridged rubber finish. The rotation of focusing ring is smooth with good resistance and this is very important because due to long focal length focusing is very severe and easy to miss. The rotation of focusing ring is about 270 degrees that allows to focus from 115cm getting 1:2.5 magnification scale. Kenko Mirror Lens 400mm F8 may be used as macro lens, but the range of utilization can be limited. Lens body is made from metal and presented in 3 color variations: Black, Titanium and White. Example of shot. 3 m distance to the object. What is the limits of challenge with Kenko Mirror Lens 400mm F8 400mm focal length is great, but 800mm is greater. We shot...

img:Some notes about cross screen filters
Aug 30, 2015

Some notes about cross screen filters

From Joe Ipsilanti and "Pro Photo" Among variety of filters cross screen effect filters or star filters are often staying behind the screen. But in fact these kind of filters are very unique and have power to completelychange your image. So, what are these cross screen filters for? Looking through photos you might notice lights that are creating a cross of 4 or 6 rays around some points of light sources. The image is very romantic and impressive. As a rule, this effect is achieved by making aperture size as small as possible. This creates crossing lights coming through diaphragm blades. Sometimes this effect looks cool. But due to some inconvenient conditions like dark places closed diaphragm cannot be implemented effectively. Moreover, cross lights may not appear as you desire. For this purpose cross screen filters are the most effective way to express your intentions. The secret is in many scratches on the surface of the filter glass. The scratches change refractions of the light as you want. Cross screen filter has a rotation ring. It means that filter can be rotated so the direct on of the light can be changed. Cross screen filters may be 2, 4, 6, 8 and more. Number means how many rays filter can reproduce. The most optimum number of rays is 4. Cross screen filters are mostly demanded during festivals or winter holidays when the streets are full of illumination.   For sure cross screen filters are important along with C-PL and ND filters....

img:About neutral filters
Aug 30, 2015

About neutral filters

Von Denis und "ProPhoto" http://review.lospopadosos.com/nd-filter Neutral filters may be called dimming filters or ND filter (Neutral Density). If you are long shutter speed photographer, you can use neutral filter not only at night, but also during the day time. Dimming filter does what exactly the name means - dimming, in other words reducing the volume of light, that comes through the lens. This filter may be useful when: » you want to make a portrait with open diaphragm to reduce depth of field during the sunny day. » you want to make a portrait with flash but your camera does not have FP-synchronization and shutter speed is restricted by camera. » you want to make effect of blurring motion (like waterfall) but it is too bright to make shutter speed longer. » you want to erase walking people and moving objects to shot only buildings during the day time. This is photo with short shutter speed. Now with longer shutter speed. We can see only one couple of young people who are seating on the bench and a tourist with a map. If we make shutter speed longer there will be no people left on the picture. Due to the quick change of the weather conditions color and lighting is different. Neutral filters may be of different density that can be figure out from the name of the filter. The most light one is ND2. Number means the proportion of light that comes through the filter (for ND2 the proportion is 1/2, that is a half of the whole light volume). The next towards the dark is ND4 and ND8. If you attached several ND filters an once and want to figure out what did you get in total, you have to multiply all numbers of the filters attached. ND2xND4=ND8. But if you want to set a one or more seconds shutter speed during sunny daytime, you will need ND1000 or more. Besides you have to use tripod. By the way, I do not see any reason to buy ND2, because ND2 effect can be achieved by general C-PL filter. Concerning C-PL filters beside ND filters there is a special category that is variable ND filters. Variable ND filter consists of two C-PL filters that are sandwiched together. Linear sides of two filters turned inside to face each other. This kind of construction requires high quality standards. But if...

img:Review of Kenko Mirror Lens 400mm F8 from PRO PHOTO
Aug 18, 2015

Review of Kenko Mirror Lens 400mm F8 from PRO PHOTO

From “Pro Photo" http://review.lospopadosos.com/kenko-400   This unique lens will surprise you firstly by tiny size and light weight. The secret is in its optical construction. Kenko Mirror lens 400mm F8 is designed according to mirror-lens or catadioptric system, developed by famous soviet physician Dmitriy Maksutov. The same optical structure is applied in big (up to 2 meters in length) telescopes.    What is specific thing in this lens? First, is the central part of the tube fulfilled with second mirror. This effects the speed of the lens. Second, the lens does not have aperture unit. So the control of the light volume coming to the camera through the lens can be controlled either by shutter speed, or 67mm neutral density filters. If we indicate the speed of Kenko Mirror lens 400mm as F number, it would be F8, that is not so speedy. This unique lens will surprise you firstly by tiny size and light weight. The secret is in its optical construction. Kenko Mirror lens 400mm F8 is designed according to mirror-lens or catadioptric system, developed by famous soviet physician Dmitriy Maksutov. The same optical structure is applied in big (up to 2 meters in length) telescopes.    What is specific thing in this lens? First, is the central part of the tube fulfilled with second mirror. This effects the speed of the lens. Second, the lens does not have aperture unit. So the control of the light volume coming to the camera through the lens can be controlled either by shutter speed, or 67mm neutral density filters. If we indicate the speed of Kenko Mirror lens 400mm as F number, it would be F8, that is not so speedy.   This is how Kenko Mirror lens 400mm F8 looks comparing with Nikkor 28-300mm in max. tele position. No need to say that the difference in size with classic 400mm lens will be more impressive.  In size matter Kenko Mirror lens 400mm F8 is very similar to Nikkor 18-55mm kit lens, so it may be carried in compact zoom bag. The weight is 340g that is very attractive for tele lens.   This is how Kenko Mirror lens 400mm F8 looks mounted on Nikon D700. Among other exclusive features of catadioptric system lens it should be noted exceptional sharpness and minimum chromatic aberrations. When Nikon users started forgetting about chromatic aberrations, for other cameras users this lens would be pleasant surprise.  But at the beginning it will be difficult to achieve experience in shooting sharp in-focus photos. First, long focal length will make you set short shutter speed up to 1/250 and more to avoid shaking. This will...

img:Shooting Japanese plum blossoms in macro.
Feb 28, 2015

Shooting Japanese plum blossoms in macro.

Tokyo, Koraku park.  In february in Japan spring is associated with blossom of plum trees that come in many varieties. After that in the second half of March starts cherry blossom season known as "Sakura". I could not neglect this beautiful event of the nature and went to Koraku park in Tokyo to hunt young plum flowers with macro conversion lenses for smartphone. I prepared Kenko macro and wide lens kit with magnet ring mount and Gizmon smart clip with macro lens on it.  Kenko macro&wide lens kit   Gizmon macro smart clip   Magnet type macro lens can be easily attached with the help of metal ring that is sticked around camera lens of the smartphone. What is good about magnet type mounting is that it is easy and quick to remove or change lens while taking pictures.You do not need any smartphone case to screw lenses on. Gizmon smart clip is another way of quick effective mounting lens on your smartphone. The secret is in universal clip construction that allows you to use it with either smartphone or tablets, and even PC notebooks.  The plum trees were just about to bloom and it was quite attractive show for the people with cameras in the park. I could not but join them with my unique equiment. Here below some shots I made with macro and wide conversion lenses and iPhone. Hope you enjoy it.  Thank you for watching!...

img:Spotting with Kenko MIL TOL 400mm F6.7 ED
Feb 26, 2015

Spotting with Kenko MIL TOL 400mm F6.7 ED

A story of one user's experiense with Kenko MIL TOL 400mm F6.7 ED. Aiplanes spotting at Sheremetyevo airport (Moscow, Russia). Recommended to all who are keen on aircrafts and tele photography.  Continue reading:http://ipsilanti.blogspot.ru/2015/02/spotting.html...

img:Gift Show Spring 2015 (February 4 - 6, 2015)
Feb 16, 2015

Gift Show Spring 2015 (February 4 - 6, 2015)

Photo report from Kenko Tokina Company booth. This is a brief photo report from Gift Show that was held in February at Big Sight (Tokyo, Japan). Gift Show takes place 2 times in a year been divided into Autumn and Spring events. Kenko Tokina traditionally participated in Gift Show 2015 and presented high-light products in gift/present category, that we are going to show you here.  The front view of Kenko Tokina booth as you enter the East Hall #2. The VIP space of the booth is dedicated to new Kenko pure made in Japan loupe series. High quality glass and lightweight frame with old Japanese ornament design attracted a lot of people. The other side of the exhibition board features big size loupe and magnifiers.  An example of perfect collaboration of optics and fashion. Kenko mobile category takes the center of the booth and it is not occasionaly.  Mobile corner was crowded thanks to wide variety of smart phone accessories including:Popular Gizmon iPhone case. Gizmon flash and smart clips with effect filters and conversion lenses.Clip stands for smart phones.Glass protectors for smart phones.Optics corner is presented with different models of binoculars that would be perfect for gift to a friend and children. Don't you know that Kenko supplies different health and beauty goods? Here are some products that will support your health condition.Kenko supporters. Kenko air cleaner "Virus catcher" with anti-bacteriological filter. This is important thing in house-keeping - Kenko Snake Camera. Thanks to a long and flexible optical fiber cable you can check car engine room or water supply communications in the house.The last corner is Kenko animation characters design batteries. Thank you for watching this photo report!  Watch the video what Kenko Tokina offers at Gift Show 2015!...