10 replies to this topic

[SomeonePOG]

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 -

• https://www.bhphotov...for_2_lens.html
• https://www.bhphotov..._t1_5_cine.html
• https://www.bhphotov...rical_Lens.html
• https://www.bhphotov...ical_Lens.html

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.

[Titan II]

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

 

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

[SomeonePOG]

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.

[brlasy1]

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.

[SomeonePOG]

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

[Titan II]

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/

[SomeonePOG]

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

[BPoletti]

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.  

[Tapio]

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).

[SomeonePOG]

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

[Tapio]

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).