From: Jostein [EMAIL PROTECTED]
Date: 2005/12/20 Tue AM 07:54:18 GMT
To: pentax-discuss@pdml.net
Subject: Re: Stacking lenses for macro.
Quoting William Robb [EMAIL PROTECTED]:
Which lens are you using for the aperture?
The rear lens.
In case some people read this thread
On Mon, 19 Dec 2005, William Robb wrote:
Interesting statement, can I just confirm that you are of the opinion that
the A50/2.8 is sharp wide open? I would have guessed that it would be
designed to work stopped down (*very* stopped down :-).
All the macro lenses I have worked with (notable
Quoting mike wilson [EMAIL PROTECTED]:
Does it need to be of that magnitude, as you will likely be using apertures
of much less than that? Is a bright viewfinder really neccessary? Are you
going to be picturing moving objects? Or just ones that you can't keep
still? 8-)
Yes, a bright
From: Jostein [EMAIL PROTECTED]
Date: 2005/12/20 Tue AM 11:48:31 GMT
To: pentax-discuss@pdml.net
Subject: Re: Re: Stacking lenses for macro.
Quoting mike wilson [EMAIL PROTECTED]:
Does it need to be of that magnitude, as you will likely be using apertures
of much less than
- Original Message -
From: Kostas Kavoussanakis
Subject: Re: Stacking lenses for macro.
The A100/2.8 and FA200/4 seem to work well at every aperture and
distance.
Floating elements?
I suspect this is it.
William Robb
- Original Message -
From: Jostein
Subject: Re: Stacking lenses for macro.
You might want to consider a non macro lens for the rear lens.
I've been afraid of that thought. :-)
John Shaw's best combination involved a regular 200mm f/2.8, but I cannot
foresee an enablement
Quoting mike wilson [EMAIL PROTECTED]:
OK. Seems your options are limited to throwing money at the problem or
waiting for something good and cheap to fall into your lap. Off brand stuff
like Tamron?
:-)
Options are legion. I was hoping for other people's experiences, but it seems to
be
Jostein wrote on 19.12.05 12:34:
I'd be interested to know if you have some experiences with moderate
wide-angles
reversed on a bellows as well.
My friend who is well known macro photographer in Poland took a 13 mm lens
from 8 mm film camera and reverse mounted it on *istD achieving
Tell your friend it's a great pic, Sylwek. :-)
I'm looking for something to achieve ca. 4x magnification.
I have a bellows with a total extension of 130mm. That gives roughly 2.5x with
a
50mm. A good 28mm lens would probably be optimal with a bellows, giving 4x at
112mm extension.
Or maybe
From: Jostein [EMAIL PROTECTED]
Date: 2005/12/19 Mon PM 01:07:19 GMT
To: pentax-discuss@pdml.net
Subject: Re: Stacking lenses for macro.
Tell your friend it's a great pic, Sylwek. :-)
I'm looking for something to achieve ca. 4x magnification.
I have a bellows with a total
On Mon, 19 Dec 2005, Jostein wrote:
Stopping down the 50mm to f/2 improves contrast, but introduce more optical
errors with small apertures on the 200. This leads me to believe that the best
50mm would be the one that is the sharpest at full opening, whatever that may
be...
The 50/1.7 has the
Would the Vivitar macro convertor get you there? I happen to have one
for sale but I'm thinking that the combination of doubling and
extending the lens out would increase your magnification
substantially...
Vic
On 19-Dec-05, at 8:07 AM, Jostein wrote:
Tell your friend it's a great pic,
On 19 Dec 2005 at 14:07, Jostein wrote:
Stopping down the 50mm to f/2 improves contrast, but introduce more optical
errors with small apertures on the 200. This leads me to believe that the best
50mm would be the one that is the sharpest at full opening, whatever that may
be...
What about an
From: Kostas Kavoussanakis [EMAIL PROTECTED]
Date: 2005/12/19 Mon PM 01:31:19 GMT
To: pentax-discuss@pdml.net
Subject: Re: Stacking lenses for macro.
On Mon, 19 Dec 2005, Jostein wrote:
Stopping down the 50mm to f/2 improves contrast, but introduce more optical
errors with small
On Tue, 20 Dec 2005, Rob Studdert wrote:
On 19 Dec 2005 at 14:07, Jostein wrote:
Stopping down the 50mm to f/2 improves contrast, but introduce more optical
errors with small apertures on the 200. This leads me to believe that the best
50mm would be the one that is the sharpest at full
Thanks Rob,
According to John Shaw, two macro lenses don't stack well together. Though I
doubt he has tried Pentax optics, I think I will explore other options first.
The FA 100/2.8 and A*200/4 macros are my only options on the tele side at the
moment.
Jostein
Quoting Rob Studdert [EMAIL
Quoting mike wilson [EMAIL PROTECTED]:
Stopping down the 50mm to f/2 improves contrast, but
introduce more optical errors with small apertures
on the 200. This leads me to believe that the best
50mm would be the one that is the sharpest at full
opening, whatever that may be...
Jostein
On Mon, 19 Dec 2005 14:07:19 +0100, Jostein [EMAIL PROTECTED] wrote:
I'm looking for something to achieve ca. 4x magnification.
I have a bellows with a total extension of 130mm. That gives roughly
2.5x with
a
50mm. A good 28mm lens would probably be optimal with a bellows, giving
4x at
From: Jostein [EMAIL PROTECTED]
Date: 2005/12/19 Mon PM 02:39:17 GMT
To: pentax-discuss@pdml.net
Subject: Re: Re: Stacking lenses for macro.
Quoting mike wilson [EMAIL PROTECTED]:
Stopping down the 50mm to f/2 improves contrast, but
introduce more optical errors with small
It was always my understanding that the stacked lens functioned as a
multi-element very high quality close-up lens with a high diopter value. A 50mm
lens has a diopter value of +20.
My experiments with stacked lenses have convinced me that the stacked lens
needs to have a very wide aperture to
Thanks Vic,
I have a 7-element 2x Tamron. I'll try that. And the AF 1.7x TC as
well.
Jostein
- Original Message -
From: Vic MacBournie [EMAIL PROTECTED]
To: pentax-discuss@pdml.net
Sent: Monday, December 19, 2005 2:32 PM
Subject: Re: Stacking lenses for macro.
Would the Vivitar
I have a suggestion that will get you to 2x with very high quality results.
It turns out the A2X-L teleconverter is compatible with the A* 200 F4. I've
used the combination and it works well
Jostein wrote:
Gang,
Does anyone have a recommendation for lenses that can be stacked
to
as the Nutty Norwegian even
before taking to stacking lenses...
- Original Message -
From: Tom Reese [EMAIL PROTECTED]
To: pentax-discuss@pdml.net
Sent: Monday, December 19, 2005 5:09 PM
Subject: Re: Re: Stacking lenses for macro.
It was always my understanding that the stacked lens functioned
Hi Jostein,
For 4X magnification I usually use my bellows with an FA501.4 reverse
mounted. It works quite well.
With your 200/50 combination I take it you are adjusting the aperture on
the 200. You might want to try closing the 50 slightly too, it might help.
Leon
On 19 Dec 2005 at 13:56, Kostas Kavoussanakis wrote:
Interesting statement, can I just confirm that you are of the opinion
that the A50/2.8 is sharp wide open? I would have guessed that it
would be designed to work stopped down (*very* stopped down :-).
Determined by myself using empirical
On 19 Dec 2005 at 15:34, Jostein wrote:
Thanks Rob,
According to John Shaw, two macro lenses don't stack well together. Though I
doubt he has tried Pentax optics, I think I will explore other options first.
I use TCs and tubes behind my macros for extra mag, I gave up using reversed
lenses
- Original Message -
From: Tom Reese
Subject: Re: Re: Stacking lenses for macro.
Stacking lenses is an excellent way to drive yourself nuts.
http://pug.komkon.org/01feb/pixels.html
William Robb
- Original Message -
From: Kostas Kavoussanakis
Subject: Re: Stacking lenses for macro.
Interesting statement, can I just confirm that you are of the opinion that
the A50/2.8 is sharp wide open? I would have guessed that it would be
designed to work stopped down (*very* stopped
Bill Robb replied:
Stacking lenses is an excellent way to drive yourself nuts.
http://pug.komkon.org/01feb/pixels.html
I think you were nuts before you started.
TR
- Original Message -
From: Jostein
Subject: Stacking lenses for macro.
Gang,
Does anyone have a recommendation for lenses that can be stacked to give
approximately 4x ?
John Shaw warns in his book closeups in nature that not all combinations
stack
well together, and between the
Quoting William Robb [EMAIL PROTECTED]:
Which lens are you using for the aperture?
The rear lens.
In case some people read this thread to gather information, I should add that if
the reversed lens is used for stopping down, the result is vignetting.
You might want to consider a non macro lens
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