Opticron ESGA and Lumix TZ3 Vignetting - advice please (1 Viewer)

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Perry Grin

Well-known member

• Jan 28, 2008

• #1

Opticron HDF zoom and Lumix TZ3 Vignetting - advice please

Hi All,

Firstly, I'm not into digiscoping big time, but always like to try and take a couple of record shots every now and then and obviously want them to be as nice as poss. Secondly I'm assuming vignetting is the term to describe the effect when your picture is blacked out except for a circular view in the middle which had your subject in it!

Currently I have the Lumix TZ3 which I am using hand held against the lens. With my opticron IS60 scope the shots I get are fine - no vignetting, but as this is a non-ED scope overall quality is not great

When I use the camera with my Opticron ESGA (ED glass) and HDF lens I get quite a lot of vignetting. I've tried zooming in and out with scope and camera but without much luck.

Are there any tricks of the trade or is this simply something that should be dealt with by cropping?

Thanks in advance

Perry

 

Last edited: Jan 29, 2008

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Perry Grin

Well-known member

• Jan 29, 2008

• #2

Bump!

 

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Henry B

Well-known member

• Jan 29, 2008

• #3

Think theres a conflict on match up ,what lens are you using.

 

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Perry Grin

Well-known member

• Jan 29, 2008

• #4

Henry B said:

Think theres a conflict on match up ,what lens are you using.

Click to expand...

The HDF zoom. Does this mean that the two just aren't compatible?

 

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Henry B

Well-known member

• Jan 30, 2008

• #5

Perry, have you checked out the digi-scope forums ,there,s more info in their than I will ever know.

 

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Perry Grin

Well-known member

• Jan 30, 2008

• #6

Henry B said:

Perry, have you checked out the digi-scope forums ,there,s more info in their than I will ever know.

Click to expand...

Yeah, I have had a brief look around. Seems that the eyerelief/lens diameter/focal length doesn't quite match up. There are a few photoshop fixes suggested but I've got too much vignetting for that. Think I'll just try to crop out the vignette and see if the resolution holds out.

I only posted this in case someone had a magic fix!

Cheers

Perry

 

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Texun

member

• Mar 25, 2008

• #7

Ideally, the lens diameter of the camera lens should be smaller than the lens of the eyepiece. Also I prefer non-zoom eyepieces and really like the Pentax XL series.

 

alan_rymer

Well-known member

• Mar 25, 2008

• #8

I use the ES80 GAED with HDF Zoom lens.
With my Canon Powershot A95, Zooming out on the camera to x2 gets rid of vignetting.
I have just started using the A640 ( much larger lens and is x4 zoom ), and vignetting is always there, but it doesn't matter as its 10MP so I just crop!.

Don't know the spec of your camera, its possible you are always going to have this problem!.

 

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Perry Grin

Well-known member

• Mar 25, 2008

• #9

alan_rymer said:

I use the ES80 GAED with HDF Zoom lens.
With my Canon Powershot A95, Zooming out on the camera to x2 gets rid of vignetting.
I have just started using the A640 ( much larger lens and is x4 zoom ), and vignetting is always there, but it doesn't matter as its 10MP so I just crop!.

Don't know the spec of your camera, its possible you are always going to have this problem!.

Click to expand...

Yeah! It looks like I am just going to have to get used to this. I'm getting best results by zooming in a touch (about 1.5x) and then cropping. Images aren't great, but I'm only really trying to get reasonable record shots and they are more than adequate for that.

Cheers

Perry