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Venus Optics STF 105mm F2
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PostPosted: Fri May 08, 2015 2:19 pm    Post subject: Venus Optics STF 105mm F2 Reply with quote
They have finished a working prototype. Samples here http://forum.xitek.com/thread-1444928-1-1-2.html .

Update:

STF 105mm F2.0(T3.2)
AoV: 11 degrees and 38"
Construction: 11e/8g
Aperture blades No.: 8 for F aperture, 14 for T aperture(both aperture can't use at the same time like the Minolta STF).
Mechanical automatic aperture control on Nikon, Pentax and probably Sony A mount.
MFD: 0.9M
Size: 76x98.9mm
Filter: 77mm
Weight: ~745g

Price: CNY 3880

http://forum.xitek.com/thread-1533456-1-1-1.html

Last edited by calvin83 on Mon Jan 18, 2016 5:16 am; edited 7 times in total


PostPosted: Fri May 08, 2015 2:27 pm    Post subject: Reply with quote
Wow, very nice and sharp. Great color and contrast -- nice saturation. I can count her eyelashes and the individual strands of hair on her forehead.

I'm not familiar with the make and model. Is this an AF lens? Price range?


PostPosted: Fri May 08, 2015 2:38 pm    Post subject: Reply with quote
A lens with apodization filter?
A competitor to the rare lenses with this - whow! 105mm with f/2 T3.0 sounds for me more useful than the Sony 135 STF.

Their preliminary 15mm f/4 wideangel macro lens sounds interessting too!

Last edited by ZoneV on Fri May 08, 2015 2:44 pm; edited 1 time in total


PostPosted: Fri May 08, 2015 2:38 pm    Post subject: Reply with quote
cooltouch wrote:
Wow, very nice and sharp. Great color and contrast -- nice saturation. I can count her eyelashes and the individual strands of hair on her forehead.

I'm not familiar with the make and model. Is this an AF lens? Price range?


Venus Optics recently released a really good 2:1 macro lens 60/2.8 (about $370) and it's fully manual. I think this 105mm will be manual, too, and I hope that the price is also reasonable. If it's around $400 I will consider getting it, looks very promising.


PostPosted: Fri May 08, 2015 2:48 pm    Post subject: Reply with quote
@cooltouch
Manual lens. No price info till now.

@ZoneV
Form what I understand, the apodization is build and the lens comes with two sets of aperture.

@Langstrum
I think they will give this lens a competitive price.


PostPosted: Fri Nov 13, 2015 6:42 pm    Post subject: Reply with quote
Update:
Tentative spec.(the final spec. should not be far away from this):

    Color Black/Silver grey
    MFD 0.9M
    Focus throw ~270 degrees
    98.9mmx76mm/700-800g(both measured without the hood attached)
    Automatic aperture control on some mounts


http://forum.xitek.com/forum-redirect-goto-findpost-ptid-1444928-pid-63606104.html


PostPosted: Sat Nov 14, 2015 9:39 am    Post subject: Reply with quote
Looks pretty good to me except the MFD, which is too long my my photography


PostPosted: Sat Nov 14, 2015 10:20 am    Post subject: Reply with quote
I've never understood people complaining about MFD, that's what extension tubes are for.


PostPosted: Sat Nov 14, 2015 12:17 pm    Post subject: Reply with quote
0.9M should be fine for portraits which is the main purpose of this lens. Friends


PostPosted: Fri Dec 04, 2015 8:39 am    Post subject: Reply with quote
New sample http://forum.xitek.com/forum-redirect-goto-findpost-ptid-1444928-pid-64048778.html


PostPosted: Fri Dec 04, 2015 12:55 pm    Post subject: Reply with quote
Judging from the samples, the bokeh is so smooth and the microcontrast is top-notch, it's so good that I can see hairs from model's nose...


PostPosted: Sat Jan 02, 2016 1:04 pm    Post subject: Reply with quote
The pre-sale are now available, more information here
http://forum.xitek.com/thread-1533456-1-1-1.html

STF 105mm F2.0(T3.2)
AoV: 11 degrees and 38"
Construction: 11e/8g
Aperture blades No.: 8 for F aperture, 14 for T aperture (Both aperture can't be used at the same time?)
Filter size: 67mm
Size: 76x98.9mm
Weight: ~745g

Price: CNY 3880

Last edited by calvin83 on Sat Jan 02, 2016 3:45 pm; edited 1 time in total


PostPosted: Sat Jan 02, 2016 1:57 pm    Post subject: Reply with quote
Looks like a fun lens to use!


PostPosted: Sat Jan 02, 2016 2:00 pm    Post subject: Reply with quote
calvin83 wrote:
The pre-sale are now available, more information here
http://forum.xitek.com/thread-1533456-1-1-1.html

STF 105mm F2.0(T3.2)
AoV: 11 degrees and 38"
Construction: 11e/8g
Aperture blades No.: 8 for F aperture, 11 for T aperture (Both aperture can't be used at the same time?)
Filter size: 67mm
Size: 76x98.9mm
Weight: ~745g

Price: CNY 3880


T and F aperture are not two different apertures, I think, just given for videographers/filmers
(T stands for transmission and reflects the true light transmission of a lens at a given f-stop,
see https://en.wikipedia.org/wiki/F-number#T-stop )

Last edited by kds315* on Sat Jan 02, 2016 2:07 pm; edited 3 times in total


PostPosted: Sat Jan 02, 2016 2:02 pm    Post subject: Reply with quote
It looks like a very good lens to me and the price of ~600$ is reasonable.

IMO, the second aperture could be placed very near to the apodization filter to control the apodization effect and it induces a non-linear reduction in the light transmission, too (the reason to mark it in T values).


PostPosted: Sat Jan 02, 2016 2:15 pm    Post subject: Reply with quote
I think the aperture works like the one in the Minolta STF: the 8-blade aperture works in auto aperture mode(on Nikon, Pentax etc.) while the 14-blade aperture is a step-less aperture.

Last edited by calvin83 on Sat Jan 02, 2016 3:45 pm; edited 1 time in total


PostPosted: Sat Jan 02, 2016 2:22 pm    Post subject: Reply with quote
Anyway, to use a f-stops marked diaphragm with an apodization filter is, IMO, useless.
Because of the filter the f-markings do not reflect correctly the reduction in the light that reaches the sensor.
Its only reason to be there probably is to control the DOF in a traditional manner.


PostPosted: Sat Jan 02, 2016 3:25 pm    Post subject: Reply with quote
calvin83 wrote:
I think the aperture works like the one in the Minolta STF: the 8-blade aperture works in auto aperture mode(on Nikon, Pentax etc.) while the 11-blade aperture is a step-less aperture.


Where did you find this info about the two apertures Calvin? Maybe it was hidden in the chinese text...


PostPosted: Sat Jan 02, 2016 3:44 pm    Post subject: Reply with quote
kds315* wrote:
calvin83 wrote:
I think the aperture works like the one in the Minolta STF: the 8-blade aperture works in auto aperture mode(on Nikon, Pentax etc.) while the 11-blade aperture is a step-less aperture.


Where did you find this info about the two apertures Calvin? Maybe it was hidden in the chinese text...

This is what I think. We will know more details later when reviews avaliable.

P.S. There should be 14-blade aperture for the T aperture.


PostPosted: Sat Jan 02, 2016 4:03 pm    Post subject: Reply with quote
OK, I hope we find out soon about that interesting lens.


PostPosted: Wed Jan 13, 2016 4:33 pm    Post subject: Reply with quote
As there are many website reporting the news of this lens, I think it is time to move this thread to the public area.


PostPosted: Wed Jan 13, 2016 4:38 pm    Post subject: Reply with quote
calvin83 wrote:
As there are many website reporting the news of this lens, I think it is time to move this thread to the public area.


DONE!


PostPosted: Wed Jan 13, 2016 4:43 pm    Post subject: Reply with quote
Thanks Klaus!

I saw someone asked in the pentaxforums regarding the aperture control: the Nikon and Pentax version of this lens has mechanical automatic aperture control. The Sony A version may have automatic aperture control but I can't confirm at this moment.


PostPosted: Wed Jan 13, 2016 10:27 pm    Post subject: Reply with quote
From some of the test images it looks like the apodization filter is not very strong.
But lets wait and see a 1:1 comparison with the Minolta/Sony STF and Fuji. And probably further competitors like that current Kickstarter project.


PostPosted: Thu Jan 14, 2016 3:20 am    Post subject: Reply with quote
Yes. It is certain that the Minolta/Sony STF has a stronger apodization filter than this lens. The sharpness and CA control seems pretty good to my eyes with the current samples. This lens will starts shipping within a few days and we will see more comparison in a short time.
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