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Fun with an old 135mm Lens

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#1 buckeyestargazer

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Posted 29 March 2013 - 12:40 PM

I picked up an old Vivitar 135mm SLR lens that has a screw mount and attached it to my Atik 383L to see what it could do. The minimum f/stop I can go to is f/5.6. Lower than that and the stars get really weird. There's also a fair amount of curvature in the corners, but I don't think it's too bad for a $25 lens bought on fleabay. With my camera the lens give a 6x8 degree FOV.

For the first test I chose the area around IC443/NGC2174/M35.

Posted Image

Comments, critique, questions always welcome.

#2 Bill Snyder

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Posted 29 March 2013 - 03:17 PM

Nice Joel. I always love those widefield shots. I would like to put something together like this someday.
Bill

#3 rigel123

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Posted 29 March 2013 - 04:39 PM

Really cool!

#4 gatsbyiv

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Posted 29 March 2013 - 05:57 PM

Great shot, and the performance of the lens is actually pretty good, especially for $25! You don't often see that area as a widefield, and it has a nice mix of objects.

#5 LazyLightning

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Posted 30 March 2013 - 03:00 AM

Nice choice for a first light with it, really like the field it gives you.

#6 kfir Simon

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Posted 30 March 2013 - 04:05 AM

That is a great image - who said that AP is expensive? :roflmao:

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#7 Harel_Boren

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Posted 30 March 2013 - 06:02 AM

Hmmmmm... I really wasn't expecting this quality when clicking on the link !!!
Just wonderful. Would you be adding color to it too?
Cheers,
Harel

#8 buckeyestargazer

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Posted 30 March 2013 - 09:01 AM

Hmmmmm... I really wasn't expecting this quality when clicking on the link !!!
Just wonderful. Would you be adding color to it too?
Cheers,
Harel


I would like to add color but I doubt I'll be able to get to it this season, unless the weather drastically improves and I can get more than one night in a month!

#9 fetoma

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Posted 30 March 2013 - 10:17 PM

Nice shot Joel! I think if you try to use color, you may get some purple fringing, but it looks great in mono!

#10 buckeyestargazer

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Posted 30 March 2013 - 10:32 PM

Nice shot Joel! I think if you try to use color, you may get some purple fringing, but it looks great in mono!


The glass in these types of lenses is surprisingly good. I've also used a similar 55mm lens, and took this HaRGB shot of Orion:
Orion Constellation

I didn't detect any purple fringing on this one, so I'm hoping that there's not much color aberration with the 135mm lens either. I will probably be shooting mostly narrowband with this lens anyway, which should also eliminate false color.

#11 Dr Benway

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Posted 31 March 2013 - 12:38 PM

I have been collecting the Pentax M42 screw base lenses on eBay for the last few months. I use a Baader Planetarium Russian adapter (M42X1.0-M42X0.75) to mate with my QHY8PRO. Here is the Belt & Sword of Orion with a 100mm Vivitar f/2.8 stopped @ f/4

http://www.astrobin....32617/?mod=none

John

#12 buckeyestargazer

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Posted 31 March 2013 - 02:07 PM

John,
These lenses are great, aren't they? I'm curious, did you crop that image of Orion at all? I couldn't see much curvature in the image, but with my setup I get some curvature in the corners. Not bad for such a wide field, but it's obvious in my images.

#13 Dr Benway

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Posted 31 March 2013 - 11:03 PM

John,
These lenses are great, aren't they? I'm curious, did you crop that image of Orion at all? I couldn't see much curvature in the image, but with my setup I get some curvature in the corners. Not bad for such a wide field, but it's obvious in my images.


I didn't crop the image. It is an f/2.8 lens stopped at f/4. 23X600 seconds. I shot Rho Ophiuchus in February with the same setup.

http://www.astrobin....35763/?mod=none

John

#14 buckeyestargazer

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Posted 31 March 2013 - 11:51 PM

I think I'm seeing about the same amount of field curvature in my image as I see in your images. I had the lens at f/5.6 Any more open than that and the stars started to develop "wings".

I don't know much about SLR lenses. Is there any way to flatten the field a bit more?

#15 Dr Benway

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Posted 01 April 2013 - 09:07 AM

I shoot flats with an EL panel, and use the DBE tool in PixInsight. My flats don't show much of a gradient.

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#16 buckeyestargazer

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Posted 01 April 2013 - 09:34 AM

Your flat looks a bit cleaner than mine! I also think I've got a bit more gradient than you.

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