So i recently purchased a 2nd hand rokinon 10mm lens for my canon

>>3029438
I dont know if you got a lemon or not, but in live view try zooming in to pinpoint the focus. Just to see if it works.

>>3029443
still nothing :/
its so odd though because there is no focusing issues at the other stops

This is a photo board, post examples of the missed focus.

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>>3029449
here is the blurred one

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>>3029449
and here is the focused on, the first one is at f2.8 where as the other one is at f11 both focused on .24 meters

[EXIF data available. Click here to show/hide.]

Camera-Specific Properties:
Camera Software	Adobe Photoshop Lightroom 6.1 (Windows)
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>>3029438
shameless bump

Looks like it's just a shit lens. They're both focused roughly at the wall on the right but the f/2.8 is much softer. Even the f/11 shot is total shit in terms of sharpness.

>>3029476
and i suppose there is no way to repair this lens even at a repair shop?

>>3029480
Probably not worth the cost. Go outside and take some more photos with it at varying focus distances and maybe we can pin down what's wrong with it.

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>>3029485
hopefully i did this correctly, but this one is from .27 m

[EXIF data available. Click here to show/hide.]

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File: IMG_8149.jpg (348KB, 5184x3456px) Image search: [Google]

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>>3029485
.3m and i have more but as i got closer to 1m things just go worst

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Equipment Make	Canon
Camera Model	Canon EOS REBEL T5i
Camera Software	Adobe Photoshop Lightroom 6.1 (Windows)
Image-Specific Properties:
Horizontal Resolution	240 dpi
Vertical Resolution	240 dpi
Image Created	2017:02:26 11:51:34
Exposure Time	1/250 sec
Exposure Program	Manual
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The lens is perfectly fine, and it's actually a great one.
Look up information about hyperfocal distance, it's all about that.

Long story short, the smaller your apperture the larger your depth of field, and the bigger your apperture the narrower the DOF will be. Distance to your subject affects the size of your DOF at any given apperture, making it narrower as you get closer.
Given all of the above, there's something called hyperfocal distance, and it can be calculated by using a formula with apperture, focal length and sensor size as variables. By using the focusing scale on your lens you set de focusing distance to match the hyperfocal, and that way everything from half that distamce to the infinity will be in focus.
There are online calculators for this like http://www.dofmaster.com/dofjs.html

Say you have a canon (1.6x crop factor) with a 10mm lens at f/2.8. In that case, your hyperfocal distance will be 1.87m, therefore if you focus on something 1.87m away from the camera everything from 0.935m to infinity will be in focus. Stop down your apperture and that hyperfocal will get closer and closer, to the point that at f/11 the hyperfocal will be 0.48m, so if you focus on something half a meter away you will get everything in focus from 0.24m to infinity. Quite useful for street photography and video.

Try this and post results if you like, you'll see everything is fine.

>>3029492
>http://www.dofmaster.com/dofjs.html
oh okay ill definitely study this then, thank you so much. i was using a canon 50mm and was worried that my new lens was broken.

thank you anon!

>>3029487
>>3029490
Where are you getting these distance measurements from? Ignore that shit and look through your viewfinder. Are you able to get anything in focus?

>>3029492
This might be his problem but he needs to start by getting something, anything in focus to be sure the lens isn't straight up fucked.

>>3029500
um at f2.8 no... everything is blurry and the more i focus on things further, it seems to just get blurrier,

>>3029500
the only time i get any sharpness is when i drop the stop to like f11 but even then its nothing super stunning

>>3029508
Lens is fucked mate.
if you bought this on ebay/amazon/store, return it.
If you bought it off craigslist then you're probably fucked, see if you can get the receipt off the previous owner and claim on warranty.

>>3029512
sigh... fair enough i doubt ill be able to get that so hopefully i can get it repaired granted now its going to cost me in total retail price. thank you anyways

>>3029512
i was able to fix it! i removed the bayonet and then stuck some paper to get everything in focus. now when the distance says 24 mm, i can focus on an object that is that distance.

>>3029559
can you elaborate on this
what exactly did you do

>>3029587
yeah sure, so what i did was loosen the three screw on the bayonet(lens mount), then i put it on the camera. i took a ruler and measured out 24mm since thats the minimum focus distance and then moved the lens around until that object

>>3029587
is in focus, at that point i unscrew it and try to recreate that shift with some paper underneath the bayonet/mount, then tighten the screws down. its not the prettiest job ever, but its not that noticeable either.

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>>3029587
just for reference, and although i didnt really try to get perfect focus, but here is how the lens captures now. when i really try to focus its sharp as hell.

[EXIF data available. Click here to show/hide.]

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Equipment Make	Canon
Camera Model	Canon EOS REBEL T5i
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>>3029598
Better, but now it's tilted against the focal plane as you can see how the right and left sides of the garage/covered parking areas go out of focus even though they're on the same focal plane as the center. Your lens is fucked but if you can make it work for your purposes then rock on.