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Lens review

2011-09-12
 

Samyang 7.5 mm f/3.5 UMC Fish-eye MFT

9. Ghosting, flares and transmission

A transmission graph of the tested lens is presented below.

Samyang 7.5 mm f/3.5 UMC Fish-eye MFT - Ghosting, flares and transmission

It’s worth comparing with a similar graph, presented in the Panasonic-Leica DG SUMMILUX 25 mm f/1.4 ASPH lens test, published not so long ago. Such a comparison is very appropriate because both lenses feature 7 groups of optical elements so 14 air-to-glass surfaces to cover. The fact that the Panasonic suffers a resounding defeat here is the biggest proof that the quality of Korean Samyang’s technology is really high.

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Coatings, offered by Samyang, are quite characteristic and in full accordance with the performance of the previous models, produced by this company. When other producers usually experience problems with high transmission for the shortest wavelengths, in this area the Samyang performs the best, reaching as high as 98%. In the middle of the range we still get a splendid result of 95-96% and only on the border of the visible spectrum and infrared the transmission decreases near 90%. If you consider the result from the middle of the spectrum as reliable, the efficiency on one air-to-glass surface can be determined as 0.3-0.4%. In the case of blue light it even increases to a really sensational level of 0.2%. A round of applause!

Despite the ultra-wide angle of view the lens works against bright light well. This good result can be partially caused by the hood which is permanently attached to the lens. The problem is that in certain situations the hood is too short to protect the lens against all rays of sunlight. The performance of the lens is so nice that flares must be actively looked for in photos. The examples below show weak light artifacts which are visible just next to my stylish shoes and very shapely legs.

Samyang 7.5 mm f/3.5 UMC Fish-eye MFT - Ghosting, flares and transmission

Samyang 7.5 mm f/3.5 UMC Fish-eye MFT - Ghosting, flares and transmission

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