Home
SearchSearch MemberlistMemberlist RegisterRegister ProfileProfile Log in to check your private messagesLog in to check your private messages Log inLog in

testing my lenses - part 85 - Sirius 18-28mm/4
View previous topic :: View next topic  


PostPosted: Tue Nov 15, 2011 12:31 am    Post subject: testing my lenses - part 85 - Sirius 18-28mm/4 Reply with quote

m42 mount, this is the first lens i don't like a performance of













PostPosted: Tue Nov 15, 2011 2:07 am    Post subject: Reply with quote

It's not that bad, last shot is quite good. IQ isn't everything.


PostPosted: Tue Nov 15, 2011 5:16 am    Post subject: Reply with quote

Those pictures are good! Much better than I tought! I had this lens once and it produced the crappiest images and not a single sharp one even at f11!


PostPosted: Tue Nov 15, 2011 8:31 am    Post subject: Reply with quote

Hm, not as bad as I expected, but not really suitable for landscapes as I did expected.

It is reasonably sharp in the center but only there. The lack of definition as even before you reach the edges is bad for landscapes but it leads to pretty attractive bokeh and OoF areas making this lens a reasonable choice for cityscapes or street photography, or even wide portraits.


PostPosted: Tue Nov 15, 2011 8:51 am    Post subject: Reply with quote

Maybe all Sirius lenses are just average....my Sirius 28-200 f4-f5.8 is nothing special.


PostPosted: Tue Nov 15, 2011 9:11 am    Post subject: Reply with quote

sirius lenses are made by korean samyang, this same lens comes under following names:samyang, centon , cambron , exakta varioplan , vitacon, beroflex,practicar


PostPosted: Tue Nov 15, 2011 5:43 pm    Post subject: Reply with quote

Yes.. made by Samyang, back when they still consistantly introduced crappy lenses.


PostPosted: Tue Nov 15, 2011 9:43 pm    Post subject: Reply with quote

I also have a Sirius branded version of this lens in Nikon mount and my experience is in line with these results. At 18mm, it is rubbish at f4 and at f8 it is still soft at the edges even on 4/3. It must be dreadful on full frame. I found the edge softness was not equal left and right, so there is presumably quality control issues with the centring of this lens.

I also found the lens is exceptionally poor when focused on distant objects. It is soft everywhere then. But the centre does get acceptably sharp when focused at closer distances. This is either another quality control issue or the design is badly corrected at infinity.

Mark


PostPosted: Fri Dec 16, 2011 5:54 pm    Post subject: Reply with quote

I find this strange because my Centon branded version was much sharper when stopped down a little, perhaps it is sample variation or there are unknown variations that we are unaware of, perhaps Samyang offered more than one level of quality?

Here are my results with the lens:

http://forum.mflenses.com/viewtopic.php?t=38725


PostPosted: Sun Mar 10, 2013 8:37 pm    Post subject: Reply with quote

new samples using E-M5