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Samples: Mamiya Sekor SF C 145mm F4.0

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waldo_posth View Drop Down
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Post Options Post Options   Quote waldo_posth Quote  Post ReplyReply Direct Link To This Post Topic: Samples: Mamiya Sekor SF C 145mm F4.0
    Posted: 26 May 2015 at 13:34
Samples: Mamiya Sekor SF C 145mm F4.0

mount: Mamiya 645 manual focus
format: 6 x 4,5 cm
year: ca. 1975-2000
max aperture: F/4
min aperture: F/32
elements/group: 7/5
aperture blades: 8
min focus distance (mm): 1500
filter diameter (mm): 77
length (mm): 115,5
weight (g): 900

additional information:
This is a soft focus lens. The soft focus effect is adjustable and most visible wide open. Stopped down it almost vanishes completely. In addition to the SF ring, the focus ring and the aperture ring there is broad additional ring which can be used - by pushing back - to close the aperture continually without any clicks. This helps to manually focus this lens: The soft focus effect does make exact focusing difficult.

Used on a full frame body the lens is amazingly sharp even wide open (probably due to the fact that only the center of the image circle is used). Sharpness at infinity, using the strongest soft focus effect, is somehow limited; but this is rather due to the character of soft focus, of course. The lens is built like a tank, quite heavy, but does not feature a tripod collar. Colors are very good IMO; flare is very special with this lens: The lens is particularly sensitive to bright white lights - see the examples below.

Although this is a medium format lens from the days of film I am quite confident that the soft focus effect cannot easily be imitated by software processing.

The camera used is a Sony SLT-A99V with a Novoflex Mamiya 645-Minolta AF adapter.

This thread is open for C&C and for posting additional pictures. Please ONLY post pictures taken with the lens in the title - or start a new thread.

#1 Mamiya Sekor SF C F/4 145mm



#2 Soft focus ring



#3 Strong SF effect F/4



#4 Medium SF effect F/4



#5 Weak SF effect, stopped down to F/8



#6 Comparison - strong SF effect F/4



#7 Comparison - weak SF effect F/4



#8 Comparison - strong SF effect F/4



#9 Comparison - weak SF effect F/4



#10 An example for the typical SF "flare"



#11



#12



#13



#14



#15



#16



#17



#18



#19



Thank you for viewing!

Edit: links restored! I have added the images from the "The 2015 Day Prime Challenge" - instead of a link (#14-#19).

Edited by waldo_posth - 22 July 2017 at 22:12
"Stare, pry, listen, eavesdrop. Die knowing something. You are not here long." (Walker Evans)   http://www.flickr.com/photos/waldo_posth/
 



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darosa View Drop Down
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Post Options Post Options   Quote darosa Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2015 at 23:59
Thanks for adding this special lens to the Samples forum Harald!

I'll add a few shots (all with a7s):


1 Violets


2 Onions


3 Orchid


4 MA 229


5 Yellow door


All these were made wide open (F4) and the 'soft focus ring' on either orange (max) or red (medium).

More examples here.
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waldo_posth View Drop Down
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Post Options Post Options   Quote waldo_posth Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2018 at 12:26
Peonies - soft focus ring on red (middle position).

Sony A99M2 Novoflex adapter
Other images of these peonies are here and here.
"Stare, pry, listen, eavesdrop. Die knowing something. You are not here long." (Walker Evans)   http://www.flickr.com/photos/waldo_posth/
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