samyang 35mm f1.4 - Page 2

gbeal · #21 25-04-2013, 02:07 PM

Difficult to follow, but from what I think you are suggesting, the Samyang is better, correct?
Definitely interesting.
Gary

blink138 (Pat) · #22 25-04-2013, 02:32 PM

it certainly looks better to me gary but these are the very first time i have ever used any sort of lens on a dslr
i am not even toatally sure if indeed it is a fair comparison as the canon is zoom and the sam not
i just had them both at 35mm and f2.8
pat

gbeal · #23 25-04-2013, 03:13 PM

Zoom? OK, that might be enough to make such a difference. Not really fair at all then, LOL.
Anyway, the SY seems a good lens, and stopped down a tad can only get sharper.
Gary

gregbradley · #24 28-04-2013, 09:29 PM

Quote:

Originally Posted by obsidianphotos

Thank you so much for the pics Pat. Really appreciate it. Certainly looks the goods. Tiny bit of coma evident but a lot less than I expected for F/1.4
Definitely adding it to my shopping list.....
Cheers

I don't know. Thats a fair bit of coma.

It probably would disappear around f2 to F2.2 if its the same as its 24mm F1.4 sibling I have. So in a way these F1.4 lenses are a misnomer for astro work. They are usually no good until stopped down. Coma and chromatic aberration are too high until about F2.2 and you are back to practically F2.8 anyway. In terrestial imaging these characteristics are not so much of a problem as they are bought mainly for shallow depth of field effects. But for astro coma and CA are super important.

Sigma 35mm F1.4 is the lens to get here. More expensive but hey - its the sharpest lens DXO Mark has ever tested. That's an amazing feat.

The trouble of course is they are $800.

Having said that my Samyang 24mm F1.4 is a nice lens and gives rich colours. Its also got a nice focus ring feel which is important with a manual focus lens.

Greg.

blink138 (Pat) · #25 29-04-2013, 07:20 PM

Quote:

Originally Posted by gregbradley

I don't know. Thats a fair bit of coma.

It probably would disappear around f2 to F2.2 if its the same as its 24mm F1.4 sibling I have. So in a way these F1.4 lenses are a misnomer for astro work. They are usually no good until stopped down. Coma and chromatic aberration are too high until about F2.2 and you are back to practically F2.8 anyway. In terrestial imaging these characteristics are not so much of a problem as they are bought mainly for shallow depth of field effects. But for astro coma and CA are super important.

Sigma 35mm F1.4 is the lens to get here. More expensive but hey - its the sharpest lens DXO Mark has ever tested. That's an amazing feat.

The trouble of course is they are $800.

Having said that my Samyang 24mm F1.4 is a nice lens and gives rich colours. Its also got a nice focus ring feel which is important with a manual focus lens.

Greg.

thanks for the input guys....... now is the comparison unfair because one of them is a zoom?
and greg i must admit i dont see much coma on the samyang compared to the canon...... i guess thats why i am interested in how fair a comparison really is as this is my first ever lens
pat

gregbradley · #26 29-04-2013, 08:16 PM

Fair enough Pat. If it responds like my 24mm F1.4 coma is not an issue after F2. It was below that.

I think you'll find that this is typical of fast lenses. They exhibit coma and false colour wide open and need to be stopped down to clean up.

So there is a slight gain compared to an F2.8 lens but not as much as it could be.

My Nikon 85mm F1.8g and 50mm F1.8g werre good from about F2.0 to F2.2 as well.

Greg.

blink138 (Pat) · #27 29-04-2013, 08:58 PM

Quote:

Originally Posted by gregbradley

Fair enough Pat. If it responds like my 24mm F1.4 coma is not an issue after F2. It was below that.

I think you'll find that this is typical of fast lenses. They exhibit coma and false colour wide open and need to be stopped down to clean up.

So there is a slight gain compared to an F2.8 lens but not as much as it could be.

My Nikon 85mm F1.8g and 50mm F1.8g werre good from about F2.0 to F2.2 as well.

Greg.

ah i see what you are saying now greg
is it unfair comparison because the samyang has been stopped down but the canon is wide open at f2.8?
would the canon look a lot better stopped down a couple of stops? (because that looks awful on the edge at 2.8)
the next chance i get then i will take a short exposure with the samyang at f1.4
pat

Hakka (Lincoln) · #28 30-04-2013, 10:01 PM

If anyone wants samples from the sigma 35 let me know.

gregbradley · #29 01-05-2013, 08:14 PM

Quote:

Originally Posted by Hakka

If anyone wants samples from the sigma 35 let me know.

Me please. This lens is high on my wish list.

Greg.

gregbradley · #30 01-05-2013, 08:17 PM

Quote:

Originally Posted by blink138

ah i see what you are saying now greg
is it unfair comparison because the samyang has been stopped down but the canon is wide open at f2.8?
would the canon look a lot better stopped down a couple of stops? (because that looks awful on the edge at 2.8)
the next chance i get then i will take a short exposure with the samyang at f1.4
pat

Most lenses peak in performance around F5.6 to 7.1 or close by. Its a very unusual and top end lens that is great wide open. I only know of a few like that.

F1.4 type lenses are designed for terrestial photographers to create a shallow depth of field background blur effect. So corner performance is usually not an issue as you are concentrating on something in the centre and the rest of the image is blurred. So coma, chromatic aberration are not important. Not so with astrophotography where we want speed and wideopen fast lenses with no aberrations. Not many meet that need.

Greg.

blink138 (Pat) · #31 01-05-2013, 11:24 PM

Quote:

Originally Posted by Hakka

If anyone wants samples from the sigma 35 let me know.

yes please lincoln!
pat

Hakka (Lincoln) · #32 02-05-2013, 06:14 AM

These are full resolution JPGs, converted from D800E RAW files, unedited.

file #1 is f1.4 iso800 51sec
file #2 is f2.8 iso1600 71sec

The exposures aren't matched but it will give you an idea of the coma and CA at f1.4 and f2.8. I've only used it for one star shoot so I dont have any shots at other apertures yet.

There's also a city night shot in there, f6.3 13sec iso100, unedited.

https://www.dropbox.com/sh/89j5iyvgqhg8q6d/OAoWBWTtJh

gregbradley · #33 02-05-2013, 02:27 PM

Gorgeous shots Lincoln.

That is unbelievable. There is no noticeable chromatic aberration in the F1.4 image. This is the first time I have seen a lens do that.

I gotta get one of those lenses. The resolution is so fine. Sigma used to be regarded as hit and miss and some good but QC issues etc but they seem to have gone to whole new level with these Art series lenses. Like a Lexus from a Toyota.

Greg.