Author Topic: CCTV lens (Fujian China) 35mm f/1.7 (C-mount) Lens Samples ***** (Read 29019 times)

gareth · « **on:** February 01, 2010, 08:36:54 PM »

This China-made CCTV is sold locally in street / bidding sites at around USD 32.
The apertures range from f/1.7 to f/16 without clickable stops.
Minimal focusing distance - 30cm

The lens on E-P2

I tried on it on a fine day a while ago in early January.
The pictures below were cropped to square format from 4:3 originals.
Unlike its 25mm brother, the lens does not have vignetting at 4 corners.
The cropping was done only for concentrating on the subjects and for compositions.

Li Ka Shing Tower, Hong Kong Polytechnic University (HKPU)
1/200 sec - ISO 200 (No aperture info. I didn't have a consistent habit to record f-stop by then)

Apples of donation, HKPU
1/100 sec - ISO 640

Student's lockers (HKPU)
1/320 sec - ISO 200

Pebbles
1/800 sec - ISO 200 (+0.7EV)

I took the following photo in an early morning with diffuse sunlight coming through the window panes of my reading room. I can tell the aperture of this photo because the 35mm lens was at its wide open to take a photo of its smaller brother.

f1.7 - 1/40 sec - ISO 1250

adash · « **Reply #1 on:** February 03, 2010, 08:42:37 AM »

Surprisingly sharp for such a cheap lens!
As far as I know, c-mount is for 16mm film with smaller image area,
so vignetting usually occurs on m4/3 sensors, does it not?
Is this a specially designed lens for big sensor sizes, or it just happens to have a larger image circle?
Can you please post uncropped images and images with accent on bokeh?
The one I found on the net is not so nice:

gareth · « **Reply #2 on:** February 03, 2010, 08:56:48 AM »

Hi Adash.
The uncropped 4:3 JPEG 1024 pixel width of the first picture:

I cannot see vignetting for all the photos I took.

Will try bokeh later on.

whatkatiedoes · « **Reply #3 on:** February 03, 2010, 09:23:21 AM »

The locker shot is great - i love these cheap cctv lenses!

gareth · « **Reply #4 on:** February 04, 2010, 04:45:27 AM »

@adash
Tried wide open and bokeh. The day was dull and the sky was cloudy at ~5PM

f/1.7 - 1/125 sec - ISO 200 (-0.3EV)

Same place
f/5.6 - 1/60 sec - ISO 1250 (-0.3EV)

Other wide open shots:
f/1.7 - 1/80 sec - ISO 200 (-0.3EV)

f/1.7 - 1/100 sec - ISO 200 (+0.3EV)

cosinaphile · « **Reply #5 on:** February 04, 2010, 05:59:30 AM »

nice lens i want one are they on e bay?

gareth · « **Reply #6 on:** February 04, 2010, 06:27:27 AM »

@cosinaphile
I bought from this seller in Hong Kong:
http://bit.ly/bvI5FA

I searched eBay and found this offer, the lens looks the same as mine.
The seller is also from Hong Kong.
The picture link by adash is also from this source.
http://bit.ly/bHbj9b

Disclosure:
No conflict of interest. I do not know both sellers.

adash · « **Reply #7 on:** February 04, 2010, 06:28:32 AM »

Thank you very much, Gareth!
This little thingy seems to perform almost as well as big OM glass, for example.
Can you, please, do something else for me - post a 100% crop around an area you consider most contrast in first two images. Aroung the left edge of the sharpest leaf, roughly the same arrea and no more than 600px each dimension.

gareth · « **Reply #8 on:** February 04, 2010, 06:43:38 AM »

@adash
You're welcome.

Full size (4032x3024) JPEG of the two pic in my Flickr account:

http://farm5.static.flickr.com/4051/4329473567_80aa4303df_o.jpg

http://farm5.static.flickr.com/4014/4329474081_15abc8a557_o.jpg

adash · « **Reply #9 on:** February 04, 2010, 09:35:55 AM »

Gareth, thank you again.
Now we have a solid reference for this unusual lens!

PrintLabGuy · « **Reply #10 on:** February 04, 2010, 09:50:57 PM »

The bokeh in some of these images is a bit distracting and ugly for my tastes, but to each his own.

gareth · « **Reply #11 on:** February 04, 2010, 09:57:22 PM »

Yes. I also feel that the bokeh are harsh and haphazard.

They're no match with some dreamy, creamy, melancholy bokeh created by the pricey, legendary lenses. No match for the price either.

Having said, the somewhat "weird" bokeh can be a character of this particular lens, which may be relevant in some particular photographic subjects. No one can tell if I would meet with this "subject" tomorrow.

whatkatiedoes · « **Reply #12 on:** February 05, 2010, 06:23:23 AM »

Personally i love crazy weird bokeh (especially in the lawn-sprinkler photo) - it becomes a focal point in its own right

cosinaphile · « **Reply #13 on:** February 05, 2010, 08:38:36 PM »

thanks very much gareth,

cheers

cosinaphile · « **Reply #14 on:** February 05, 2010, 08:52:36 PM »

so they can make and sell this facinating for about 35 dollars us fundsand turn a profit ??!!holy moly

imagine if this company set its mind to making a 9 mm 2.5..... 11 or 12mm 1.8 thread mount or even m4\3 with the smaller
image circle of the m4\3 sensor and sold it for 149.00 us dollars

imagine the buzz in the world of photography that would be the result , imagine how many million they would sell. some one in china who could do this is gonna wake up and become rich tommorrow

MrPhotographer · « **Reply #15 on:** March 05, 2010, 10:33:35 AM »

I've bought one of these on eBay (very fast delivery - less than a week) and I'm just waiting on the c-mount adapter (not so fast delivery - 4 weeks as of today

).

Thanks for the pictures and information, after looking at your pictures... I'm getting so excited at the thought of getting my lens on my Pen.

Mike

PS. Think I may get the 25mm f1.4 too

peterb666 · « **Reply #16 on:** March 05, 2010, 10:28:30 PM »

The image is sharp and no vignetting but the bokeh is absolutely vile.

whatkatiedoes · « **Reply #17 on:** March 06, 2010, 04:26:51 AM »

peterb - That comment is a bit ironic given your signature! plenty of people like it, it's a subjective thing.

cosinaphile · « **Reply #18 on:** March 06, 2010, 06:13:51 PM »

the whole bokeh thing is overblown ,different lenses have different attributes ,
i want that lens

i dont care how harsh the bokeh is

sometimes something can be so ugly, it can be seen as beautiful, ask any breeder of chinese dogs

cosinaphile · « **Reply #19 on:** March 06, 2010, 06:20:05 PM »

ok im going out on a limb here, but ive gone back to look at the bokeh again and you know what? they looks like beautifully abstract patterns a bit.... with linear elements splaying out in random patterns , it anit the bokeh of a good leica lens , but it has a certain quirky look im not ready to dismiss because it does not conform to accepted wisdom,

for 35 bucks , its starting to look good!

Finder · « **Reply #20 on:** March 06, 2010, 06:39:29 PM »

Quote from: whatkatiedoes on March 06, 2010, 04:26:51 AM

peterb - That comment is a bit ironic given your signature! plenty of people like it, it's a subjective thing.

Don't give PeterB a hard time. From an optical stand point, the Bokeh is bad--just like a Holga lens is not sharp. But that does not mean it is not pleasing nor desirable.

voyager · « **Reply #21 on:** March 06, 2010, 06:41:13 PM »

Yeah, be nice!

(Also because he can ban you)

Not like he would though.

But I might.

(Ok that's a lie too)

gareth · « **Reply #22 on:** March 06, 2010, 06:43:19 PM »

Quote from: voyager on March 06, 2010, 06:41:13 PM

Yeah, be nice!

(Also because he can ban you)

Not like he would though.

But still be nice though.

peterb666 · « **Reply #23 on:** March 06, 2010, 08:44:46 PM »

Quote from: whatkatiedoes on March 06, 2010, 04:26:51 AM

peterb - That comment is a bit ironic given your signature! plenty of people like it, it's a subjective thing.

Look on the plus side for the lens, it is very cheap, looks very sharp and no vignetting. What a great combo.

Just keep everything in focus because the bokeh is so busy it is distracting. Good bokeh adds to an image; the multi-lined out of focus confusion in those grass shots is far from being pleasant.

By the way, I was referring to the lens image, not any particular person.

Inc · « **Reply #24 on:** April 07, 2010, 04:13:04 AM »

Hi everybody!

I'm just getting started wth my E-P1 (got it second hand 2 weeks ago with both kit lenses).
Yesterday I bought a security camera frm flea market (norma VC 563 with a molynx tv lens 8mm F1:1.3. Pretty sweet

But! There's one problem since I don't have a c mount adapter and I think it won't fit on it because the near thread diameter of the lens is a wee bit more than 37,2mm. (a little less than 38mm)

pictures: (sorry for the crappy quality, I don't have my e-p1 here with me

Are there any c mount adapter that allow me to use this lens with focus to infinity? And everything else ... ?

Thanks!

Inc.

Author Topic: CCTV lens (Fujian China) 35mm f/1.7 (C-mount) Lens Samples ***** (Read 29019 times)

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