With so many beautiful deep sky objects out 
there, how do you pick which one to shoot? Well   with fisheye lenses you don't have to pick, 
because you will literally shoot the whole night   sky in a single photo. Hello, this is Nico Carver. 
I'm a deep sky astrophotographer and in this video   i will be testing and reviewing five fisheye 
lens in terms of their night sky performance.   You can find all of my test results and reviews 
for these lenses at astrolenses.com. I received no   compensation to make this video i rented the sigma 
15 and the canon 8 to 15 from lensrentals.com   i already owned the sigma 8 millimeter circular 
fisheye i bought the opteka from amazon with   proceeds from my patreon and the tt artisan 
lens was kindly loaned to me from the company   for the purpose of this unbiased review 
i tested these lenses on my canon eos ra   camera i'm shooting on right now which is a 
full-frame camera with an extended ha response   helpful for picking up nebulae it's an rf mount 
camera so the only lens that fit directly was   the tt artisan the other lenses i adapted 
with a canon ef to rf adapter okay that's   the disclosure and sort of the setup let's jump 
into the physical characteristics of these lenses   okay starting with opteka 6.5 millimeter f3 
this is a lens that comes in at 165 dollars   it's available on canon ef and nikon f 
mounts it's designed for apsc or crop   sensors uh but it will work still on full frame 
you just have to remove the removable lens shade   and you get a circular fisheye look on 
full frame and a diagonal fisheye look on   crop sensors the lens shade is easy to 
remove you just press a button and twist   has click stops for the aperture from f3 to 
f22 it's all manual um including the focus   ring unfortunately the manual focus ring on the 
copy i have doesn't work it doesn't actually focus   uh at all to infinity or anything it just sort of 
stays the same so uh this was something that i'll   mention more when we get to the star tests and it 
was the biggest downside to this lens is that it   wouldn't uh really focus the opteka with lens caps 
on measures 105 millimeters tall 90 millimeters   across and with lens caps off it's 85 millimeters 
tall with lens caps off it's 524 grams or one   one pound three ounces with one caps on it's 
580 grams or one pound five ounces okay moving   on to the tt artisan 11 millimeter f 2.8 this 
retails for about 215 dollars it's available for   all the different mirrorless mounts including 
canon rf nikon z l mount m mount and sony e-mount it's all metal construction it's very heavy for 
its size all manual has a metal lens cap a small   metal lens shade that's not removable it's 
a clickless aperture control goes from f 2.8   to f 16.

Both the aperture control and the focus 
ring are very tight which i like they're sort of   a little bit difficult to move it measures 100 
millimeters with caps on 70 millimeters across   uh 82 millimeters with caps off it weighs 502 
grams with all caps off one pound two ounces about   with the caps on it's 546 grams or one pound 
three ounces okay the sigma 15 f 2.8 diagonal fish   fisheye that would be a diagonal fish eye on full 
frame it goes for 609. it's available on canon ef   nikon f sigma sa and pentax k amounts as a 
non-removable lens shade has mix of plastic and   metal parts so it's a it's very lightweight and 
small um it has both auto focus and manual focus   with a switch on the side uh the aperture control 
is controlled by the camera and so it just has the   focus ring for manual focusing it measures uh 89 
millimeters with caps on 75 millimeters across   the front cap 68 millimeters long with caps 
off 338 grams with caps off 12 or 12 ounces   and 384 grams or 14 ounces with the caps on okay 
next up we have the sigma eight millimeter f   3.5 circular fisheye retails new for 899.

It has 
autofocus or manual focus just like the last sigma   it has a manual focusing ring it measures 95 
millimeters with caps on 77 millimeters across 66 millimeters from front element to flange 
and 394 grams without caps or 14 ounces   and then 482 grams or one pound one ounce with 
caps on okay last lens is the set canon eight to   fifteen f4 l zoom lens this is the only zoom lens 
i tested it's just something i've always wanted   to try out um it is a circular fisheye at eight 
millimeters on full frame or a diagonal fish eye   at 15 millimeters it has a removable um lens shade 
that you would want to remove at eight millimeters   on full frame the the zoom ring is down 
here at the bottom of the lens and the   manual focus ring is more towards the top 
it is 108 millimeters tall with caps on   set 90 millimeters across 82 millimeters from 
flange to the front lens 530 grams without   caps or one point one pound three ounces 584 
grams or one pound five ounces with caps on   okay next we're actually going to look at 
some star tests here are the details for how i   conducted these star tests you can pause the video 
and read through this but the basic gist of it is   they were all done with the same conditions on new 
moon from a portal 3 site with the same equipment   okay first up we have the opteka like i mentioned 
i was not able to properly focus this lens   so all the test results came out out of focus it 
would not focus to infinity it reminds me of an an   older lens i had called the lensbaby circular 
fisheye that had sort of the same problem   and so you can't really tell much about the star 
distortion like coma or chromatic aberration   when the stars are out of focus that said it you 
know if you don't zoom in it looks fine i think   because these shots of course are so wide field so 
it's really up to you whether this focusing issue   is a is a huge problem and of course you may get 
a copy and the focus might be okay it might be a   copy to copy variation thing okay the next least 
expensive lens remember this one is only 215.

This   tt artisan 11 millimeters f 2.8 um and at f 2.8 it 
looked pretty good um but then at f 3.5 it really   sharpened up and looked great in all corners edges 
and center so i would probably use it at f 3.5   because it didn't improve much from f 3.5 up to f 
5.6 okay next up we have the sigma 15 millimeter   this had some substantial vignetting and 
other issues including pretty heavy uh   coma even at f 5.6 here's the sigma 8 millimeter 
circular fisheye and this lens looked pretty good   even at f 3.5 but it got a little bit better 
at f4 and then it didn't improve much after f4   looked pretty good from there on out the canon 
8 to 15 f4 l this is at eight millimeters so   all the way out and you get the circular look at 
f4 through f 5.6 it looked pretty much the same   all throughout there with some coma and chromatic 
aberration same thing with at 15 millimeters f4 f   4.5 and f 5.6 so it all looked about the same 
in terms of the star quality okay let's look at   some head-to-head comparisons now so these are 
center crops of just the circular fisheyes and   here it's really apparent how the opteka is 
suffering from that not being able to focus   and also here with the corner crops we 
really can't tell much about oteka's   performance like i said earlier because those 
stars are out of focus well we can see that   both the canon 8 to 15 and the sigma 8 have you 
know a little bit of chromatic aberration and coma   but really not too bad could be a lot worse and 
the the coma is a little bit more exaggerated on   the canon compared to the sigma now let's look 
at some center crops of the diagonal fish eyes   they all look really good they're all pretty 
sharp but when we look at the left edge   here you can see that the tt artisan the 
mirrorless lens but also the cheapest lens   of the three i think really wins in this 
in the edge test has the least amount of   star distortion and coma coma is that what gives 
stars instead of a circular shape more of a   triangular shape and when and when it's really 
exaggerated like on the sigma here on the right   it's sort of a triangular shape with wings it sort 
of looks like a little bird in flight um the canon   uh was again did pretty well um but but not as 
good i think as the tt artisan even though um it   did it did have uh did do a good job with contrast 
and and sharpness it it did exhibit some coma and   chromatic aberration as well okay here are my 
final thoughts on all this i was really happily   surprised by the tt artisan at only 215 dollars 
it really shows the promise of these mirrorless   lens designs you can't adapt a mirrorless 
lens to a dslr which is the big downside so   i think something like 90 percent of all camera 
you know advanced camera users are still using   dslrs and not mirrorless cameras so um it does 
limit the potential but i think mirrorless is the   future so i'm really excited by how well that 
lens did for especially considering the price   next up is the sigma eight millimeter circular 
fisheye this is a lens i already owned i bought   it used for about five hundred dollars and i was i 
was pleased by its performance it's not perfect um   but it's it's quite good for a circular fisheye 
lens and and probably uh slightly better than   the canon in terms of uh performance on stars 
after that we have opteka this one was only 150   so i didn't expect much but uh the frustrating 
thing is just like my lensbaby that i used to have   which was like a 300 lens it didn't focus properly 
to infinity i was reading this article online   um about how to maybe fix this in these cheaper 
fisheye lenses how to open them up and just change   the focal distance yourself to try to fix the 
manual focus issue and so i'm going to try that   with the subtecha since i wanted to see if i can 
make it work to finish these star tests with it uh   then we have the sigma 15 millimeter diagonal 
fish eye i was a little bit disappointed with   this one um it was nice and bright but uh the star 
distortion the coma especially towards the edges   of the frame were really pretty bad um when you 
get the sort of bird's eye bird's wing flaring   on the stars that's uh that's a pretty bad coma 
and then finally this canon 8-15 this is a f4   lens so a little bit slower if you weren't if 
you didn't have tracking i probably you know   wouldn't recommend this one because it's a little 
bit of a slower lens and it's also very expensive   um but it is cool that it combines if you 
have a full-frame camera a circular fish-eye   and a diagonal fish-eye lens into one lens so that 
sort of gives you more creative potential with it   and it the performance was quite good of course 
but it was also very expensive lens at 1300   okay so all these reviews um are going to be 
available in text form on astrolenses.com so   you can head over there to download pictures or 
read about these and you can also follow the links   on that site to purchase them through my affiliate 
links i'm just going to leave you with a processed   photo since we've been looking at single exposures 
this is a stack of a couple hours of exposures   just to show you the potential um of a fisheye 
lens uh and this was done with my sigma eight   millimeter and uh my canon ra and some different 
filters and uh lastly i just want to thank all   of my patrons over on patreon i couldn't have 
done this video without you because um you're   helping finance this channel and lets 
me do cool things like renting and   buying uh equipment in this case lenses to try 
out and review which i'm really enjoying so   here's uh to all of my patrons you're about to 
see all their names in the credits right now   until next time this is Nico 
Carver from nebulaphotos.com

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