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Looking for a good lens for APS-C format DSLR.

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#1 SomeonePOG

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Posted 04 December 2022 - 09:50 AM

Hi there,
I am looking for a good lens that's a max of 300$s-ish (would prefer if it was about 250$s).
I have a Nikon D5300 (DX format camera/1.5x crop factor) and already have the standard 18-55mm kit lens. I recently had a good run at the Orion Nebula( https://www.cloudyni...-do/?p=12327921 ) and was impressed with what I was able to do with the lens I already have. I had to crop out the rest of the image due to some weird artifacts(and there was nothing interesting) and the stars were looking bloated since I cropped it. I have seen a few videos by Nebula Photos where he uses a rokinon/samyang 85/135mm lens but he always uses them with a full frame sensor so that there's no distortion. Here's a list of a few lenses I have considered - Note: These all are 85mm since all of them are made for Full Frame sensors and are an equivalent of 127.5mm in a APS-C sensor format.
Edit: I do not own a star tracker and am saving up for one but would like to continue without one thought there are a few hurdles.

Looking forward to hearing your thoughts!

Edited by SomeonePOG, 04 December 2022 - 10:34 AM.


#2 Titan II

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Posted 04 December 2022 - 10:22 AM

https://www.cloudyni...f-so-how-is-it/

 

Rokinon and Samyang 85 1.4 are the same lens with a different name.



#3 SomeonePOG

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Posted 04 December 2022 - 10:24 AM

https://www.cloudyni...f-so-how-is-it/

Rokinon and Samyang 85 1.4 are the same lens with a different name.

From what I understand they are not really good for aps-c cameras.

#4 brlasy1

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Posted 04 December 2022 - 10:32 AM

For about that money, you could get an Astrotech AT60 new, or AT72EDII used, instead of a lens, and have a great AP setup, plus a nice grab and go telescope for visual work.



#5 SomeonePOG

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Posted 04 December 2022 - 10:33 AM

For about that money, you could get an Astrotech AT60 new, or AT72EDII used, instead of a lens, and have a great AP setup, plus a nice grab and go telescope for visual work.

I forgot to mention i do not have a star tracker

#6 Titan II

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Posted 04 December 2022 - 10:41 AM

From what I understand they are not really good for aps-c cameras.

Not a recommendation.  I only posted the info as they were on your list.  BTW... being good with full frame but not aps-c makes no sense.     

 

https://www.phototra...-on-full-frame/



#7 SomeonePOG

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Posted 04 December 2022 - 11:09 AM

Not a recommendation. I only posted the info as they were on your list. BTW... being good with full frame but not aps-c makes no sense.

https://www.phototra...-on-full-frame/


Yea but there is alot of distortion if im not wrong on apsc cameras when using the rok/sam 85mm

#8 BPoletti

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Posted 04 December 2022 - 02:00 PM

I have no direct experience with the Samyang/Rokinon 85mm f/1.4 being discussed.  I am looking for an 85mm that will work well for A/P for my Ha-modified Canon T5i (APS-C).  I have been quite satisfied with the results from a Samyang 135.. F/2.0, so I started looking at that brand.

 

There are some lens test research results on the internet for the variations of the sam/rok 85mm f/1.4 (T1.5).  At wide open aperture, the focus is soft.  There is some distortion at wide open that mostly disappears at between f/2.8 and f/4.  But that takes away the advantage of the f/1.4 aperture.

 

IIRC, in an earlier life, Nikon used to manufacture an exquisite 85mm lens.  Not sure it that would fit your needs, but there is probably a comparison between the Nikon 85mm and the Rok/Sam 85mm out on the internet.  



#9 Tapio

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Posted 04 December 2022 - 02:11 PM

As the sensor is smaller in APS-C camera there will likely be less distornions than in full frame camera.

 

Also for 85mm lens you should get a star tracker (to get longer than few second exposures).


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#10 SomeonePOG

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Posted 05 December 2022 - 09:57 AM

I have no direct experience with the Samyang/Rokinon 85mm f/1.4 being discussed.  I am looking for an 85mm that will work well for A/P for my Ha-modified Canon T5i (APS-C).  I have been quite satisfied with the results from a Samyang 135.. F/2.0, so I started looking at that brand.

 

There are some lens test research results on the internet for the variations of the sam/rok 85mm f/1.4 (T1.5).  At wide open aperture, the focus is soft.  There is some distortion at wide open that mostly disappears at between f/2.8 and f/4.  But that takes away the advantage of the f/1.4 aperture.

 

IIRC, in an earlier life, Nikon used to manufacture an exquisite 85mm lens.  Not sure it that would fit your needs, but there is probably a comparison between the Nikon 85mm and the Rok/Sam 85mm out on the internet.  

Are these 2 the same lenses ? 
https://www.bhphotov...s.html/overview
https://www.bhphotov..._t1_5_cine.html
if so will get the cheaper one, if not please tell me which one is better will be placing order once i have the money in hand



#11 Tapio

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Posted 05 December 2022 - 11:30 AM

Not quite. The Rokinon is a cine lens.

https://www.lenstip....ifference_.html

 

Don't know if in AP it makes a difference. Maybe you can setup auto focusing easier with cine version (but I have no personal experience).




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