Official Sony A7 or A7r discussion thread (Season II)
- Thread starter kei1309
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albertri
Senior Member
Will check if I could find one for LR if I could hen I may consider this lens hehehe
ricleo
Senior Member
hehe sure can find. just take from the link i provided earlier
hyperFocal
New Member
I found an alternative version (seems to be merge of 2 profiles and apparently also corrects vignetting). Have you tried this one? I dun have the lens to try.
http://www.svenstork.com/2013/10/02/rokinon-14mm-lightroom-lens-profile/
It's hard to tell because it's just 1600px, but the sides don't look especially sharp compared to the center so I'm not sure if it's sharp edge to edge. If you post a link to a full size sample, can see for sure. With the distortion, I'm pretty sure that it can't be. Seems quite a neat lens for the hobbyist , especially the central sharpness, but the distortion would be quite difficult for serious architectural use. The combination of pincushion and barrel distortion is unusual and could be caused by the adapter.
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Sample #3 taken yesterday for the sensor reflection problem.
This time its with a Voigtlander 12/5.6, so its certainly not isolated to one-two lenses.
DSC0473620140223ILCE-7-sensor_refection by jenkwang, on Flickr
However, its fixable in post with about 5 mins of cloning.
Doable, but certainly an irritation and dependant on being able to find similar textured/lighting/items to clone into.
DSC0473620140223ILCE-7-1 by jenkwang, on Flickr
This time its with a Voigtlander 12/5.6, so its certainly not isolated to one-two lenses.
DSC0473620140223ILCE-7-sensor_refection by jenkwang, on Flickr
However, its fixable in post with about 5 mins of cloning.
Doable, but certainly an irritation and dependant on being able to find similar textured/lighting/items to clone into.
DSC0473620140223ILCE-7-1 by jenkwang, on Flickr
Thoth
Senior Member
Sample #3 taken yesterday for the sensor reflection problem.
This time its with a Voigtlander 12/5.6, so its certainly not isolated to one-two lenses.
DSC0473620140223ILCE-7-sensor_refection by jenkwang, on Flickr
However, its fixable in post with about 5 mins of cloning.
Doable, but certainly an irritation and dependant on being able to find similar textured/lighting/items to clone into.
DSC0473620140223ILCE-7-1 by jenkwang, on Flickr
Wah... looks jialat sia...
ricleo
Senior Member
i did see this one, but decided not to use it as I will typically use the samyang at F8 and smaller, where there is already no vignetting problems. That profile will be useful if you intend to use the lens at F2.8 most of the time
ricleo
Senior Member
you can check out my flickr links. There are 2 night time shots the first night i got the lens. one at F8 one at F2.8 (distortion not corrected yet tho). both at full resolution of a7r.
distortion did you see my subsequent post with the ACR lens profile used? i wld say distiortion has been corrected quite satisfactorily to me.
nope the adaptor wld not cause additional distortion as it has no glass within it. The samyang is known to have this moustache distortion, but since correctable by LR/ACR profile, is of no issue.
good news. i found the lens correction profile and added it to the list of lenses in adobe camera raw folder and my CS6 now corrects my samyang perfectly. Lines are pretty much now nice and straight a click away in CS6.
source of the correction profile. I couldn't get my CS6 to recognise the additional samyang profile though. so what i did was to copy the file in and replaced the profile of the canon 14mm f2.8L.
http://ip-networx.de/index.php?option=com_content&task=view&id=49&Itemid=91
baa tanhaa
Member
i have a question..
in theory, which will be better ?
to shoot an object at 300mm focal length in full frame mode and crop to desired size or shoot at 450mm focal length in apsc mode (10megapixel)without cropping.
which option above will give better image quality?
in theory, which will be better ?
to shoot an object at 300mm focal length in full frame mode and crop to desired size or shoot at 450mm focal length in apsc mode (10megapixel)without cropping.
which option above will give better image quality?
silvermoon1407
Senior Member
Depends on the glass, and which sensors (FF and APS-C) are you comparing...
baa tanhaa
Member
let's say the glass is the sony G 70-300mm ssm with the sony a7
albertri
Senior Member
Ive read good reviews From Tamron 24-70 from Canon and Nikon mount so it should have the same performance on Sony FF including A7/r.
I am also thinking of this lens. Seems this lens performs better than the Sigma counter parts.
albertri
Senior Member
Saving this link it may come handy one day hehe. Thanks for sharing
albertri
Senior Member
Wow this is bad widest lens I have is 19 and 21 mm so far not seen this issue on A7r is this isolated to RF lenses or even SLR and FE lens?
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It's the same. When you shoot 300mm in full-frame, then crop the result into 10mpix (at the center), you'll get the same IQ as if you set the A7 into APS-C mode and shoot with 300mm x1.5. Because you're using the same center area of the sensor to capture in APS-C size instead of the whole sensor (full-frame).
The only difference I can think of is that you can frame the picture properly during the shot if you set the camera to APS-C mode, if your intention is to make use the full 450mm.
But shooting at full-frame mode give you more flexibility during cropping, e.g. you can crop a 12mpix or 15mpix size, slightly to the left/right/etc.
hyperFocal
New Member
If your lens is sharp across the frame, it is better to shoot in FF, then crop later.
baa tanhaa
Member
thanks for your clear reply.. understooded!
thanks for your reply too..
It might just be that you have not shot in similar situations yet (eg. cityscapes+light source direct at lens)
The A7r may have a different sensor cover glass and some reports suggest that the effect is 'dimmed down'.
But it certainly affects even the FE35
http://www.fredmiranda.com/forum/topic/1247655/140#12014763
http://www.dpreview.com/forums/thread/3613281#forum-post-52986111
On A7R+FE35
http://dearsusan.net/2013/12/11/spotty-flaw-in-zeiss-fe-35-28-za-sony-a7r-combo/
http://www.dpreview.com/forums/thread/3613281?page=5
On both cameras with same lenses but seemingly a bit less on A7r
http://erphotoreview.com/wordpress/?p=4431
I'm just trying to come to some sort of understanding if this will mess up photos so badly that I can't risk using it as my only tour/landscape/cityscape camera.
My feeling for now (still ongoing) is that it can be pretty ugly, but generally can be cloned out.
I will carry my DP1m as a backup when necessary.
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