#1  
Old 06-12-2017, 06:51 AM
garymck (Gary)
Registered User

garymck is offline
 
Join Date: Aug 2005
Location: Geelong
Posts: 788
Nikon lenses to CCD?

Hi,
I have some Nikon kit lenses that have no aperture selection ring that I would like to try some very wide field imaging using my ASI071MC Pro. Is there any adapter that can be used with this camera to enable aperture selection?

I have seen that there are adapters available that may be suitable, but am not sure of which one would be the correct one to get - I have no familiarity with them at all.

Would appreciate advice as to which one to get and/or if they are even suitable.

TIA
Gary
Reply With Quote
  #2  
Old 06-12-2017, 07:19 AM
Atmos's Avatar
Atmos (Colin)
Ultimate Noob

Atmos is offline
 
Join Date: Aug 2011
Location: Melbourne
Posts: 6,980
If you set one of the function buttons on your anikon as a Preview, I think that is what it’s called, it sets the aperture blades while you’re looking through the view finder as a way of judging depth of field and the like.

If you hold the preview button down while the camera is on and remove the lens with the aperture blades set at what you want, the aperture remains set.
I’ve done this with my Sigma Art 85mm numerous times.
Reply With Quote
  #3  
Old 06-12-2017, 07:24 AM
pluto's Avatar
pluto (Hugh)
Astro Noob

pluto is offline
 
Join Date: Dec 2011
Location: Sydney
Posts: 1,982
I'm sure you already know that ZWO make a Nikon lens adapter for their ASI cameras but of course it has no aperture control.

I have seen adapters for other lenses to other mounts which incorporate a mechanical iris allowing you to stop down an auto lens but nothing that would allow you to use Nikon lenses on an ASI camera.

There used to be a trick on Canon lenses where you could stop down the lens on a Canon body and then remove it from the body while holding the dof preview button and it would keep the lens at the aperture where you set it. Not sure if that works with Nikon lenses though.

However, if the Nikon kit lenses are much like the Canon kit lenses I probably wouldn't bother for astro stuff.
If it were my money I'd look for some nice older manual Nikon lenses rather than spend lots on adapters to use a kit lens.

My $0.02, hope it helps


EDIT Ah Colin got in before me!
Reply With Quote
  #4  
Old 07-12-2017, 06:49 AM
garymck (Gary)
Registered User

garymck is offline
 
Join Date: Aug 2005
Location: Geelong
Posts: 788
Thanks guys,

I'll try the preview trick - I actually have a Nikon to m42 adapter, so I'll give it a try just as an experiment. I have read that the Nikon kit lenses are not bad if stopped down a bit, so will be worthwhile as an experiment. I f I decide I like it, I will hunt down an old manual Nikon lens. Any ideas which one to hunt for around the 135-200mm mark?

cheers
Gary
Reply With Quote
  #5  
Old 07-12-2017, 07:26 AM
Atmos's Avatar
Atmos (Colin)
Ultimate Noob

Atmos is offline
 
Join Date: Aug 2011
Location: Melbourne
Posts: 6,980
I believe that some of the older 200mm F/4D lens’ were quite respectable.
Reply With Quote
  #6  
Old 07-12-2017, 07:45 AM
pluto's Avatar
pluto (Hugh)
Astro Noob

pluto is offline
 
Join Date: Dec 2011
Location: Sydney
Posts: 1,982
Quote:
Originally Posted by garymck View Post
Any ideas which one to hunt for around the 135-200mm mark?
I have an old Nikon 135/2.8 that is surprisingly sharp with virtually no coma. It also has a convenient little pull out hood built in.
Like this one.
Reply With Quote
  #7  
Old 07-12-2017, 12:06 PM
JA
.....

JA is offline
 
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 2,934
Quote:
Originally Posted by garymck View Post
Hi,
I have some Nikon kit lenses that have no aperture selection ring that I would like to try some very wide field imaging using my ASI071MC Pro. Is there any adapter that can be used with this camera to enable aperture selection?

I have seen that there are adapters available that may be suitable, but am not sure of which one would be the correct one to get - I have no familiarity with them at all.

Would appreciate advice as to which one to get and/or if they are even suitable.

TIA
Gary
Hello Gary,

There are a number of possibilities. Which lenses do you have?

Best
JA
Reply With Quote
  #8  
Old 08-12-2017, 03:18 PM
garymck (Gary)
Registered User

garymck is offline
 
Join Date: Aug 2005
Location: Geelong
Posts: 788
Hi JA
I have:
18-105 f3.5-5.6G ED
55-200 f4.5-5.6G ED
35mm f1.8G Prime

Cheers
Gary
Reply With Quote
  #9  
Old 09-12-2017, 07:46 AM
JA
.....

JA is offline
 
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 2,934
Quote:
Originally Posted by garymck View Post
Hi JA
I have:
18-105 f3.5-5.6G ED
55-200 f4.5-5.6G ED
35mm f1.8G Prime

Cheers
Gary
Well there you go. The perfect choice . The 18-105 gives up nothing really in sharpness to its prime brothers and will best or equal many. It is a very sharp lens, even wide open. The only thing you give up compared with primes is light gathering ability vide aperture. The 18-140 is also excellent. At the wide end there is slight coma, but this is reduced/eliminated at the tele end. The 18-105 is much better than the 55-200, see comparison image of MTF graphs cut & pasted below.

For what you've said you wanted to do,with your size CCD, I'd use what you have. Use your Nikon CCD adapter to mount the lens to your CCD AND if you are willing you use something to hold the iris open, by actuating the aperture lever on the back of your lens (since it is a G type lens) you're good to go. The aperture lever is not that delicate, but don't be too ham fisted.

Best
JA
Attached Thumbnails
Click for full-size image (NIKON 18-105 v 55-200.jpg)
132.6 KB15 views

Last edited by JA; 09-12-2017 at 08:36 AM.
Reply With Quote
  #10  
Old 09-12-2017, 09:29 AM
garymck (Gary)
Registered User

garymck is offline
 
Join Date: Aug 2005
Location: Geelong
Posts: 788
Thanks JA,
I found a thread elsewhere about using a piece of cotton tied to the aperture lever to hold it open. I'll give it a whirl and see how I go.

cheers
Gary
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 04:21 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement