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VichySchwa
Joined: 08 Jan 2013
Posts: 32
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 Posted: Wed Mar 20, 2013 3:30 pm Post subject: Focus to infinity? |
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VichySchwa wrote:
Got a cheap M42-EOS adapter for my T4 28mm lens to use on my 5D Mk I, and want to verify if what I'm looking at means I can't focus to infinity. To me, common sense would dictate that the marker for focus (Red dot and line in pic below) should line up with the top of the camera and this doesn't...
#1
Would I be correct that this lens won't focus to infinity? Aside from chucking this adapter and getting another (and then finding out I have the same problem with the next adapter), any suggestions? Sanding outside surface down a small amount? Has anyone bothered to destructively hack an adapter?
Thanks... |
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Aanything
Joined: 27 Aug 2011
Posts: 2187
Location: Piacenza, Italy
Expire: 2014-05-30
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| Posted: Wed Mar 20, 2013 3:36 pm Post subject: |
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Aanything wrote:
Those cheap adapters are often made with not extreme precision, so it can be that the thread is a bit rotated, but that doesn't mean it won't reach infinity. I have some in which the lens ends up with the focusing mark perfectly centered, but are slightly too thick to allow infinity.
Only way to check infinity is to try focusing on something far away, and see if focus can reach it (or maybe go past it).
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visualopsins
Joined: 05 Mar 2009
Posts: 11053
Location: California
Expire: 2025-04-11
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| Posted: Wed Mar 20, 2013 5:43 pm Post subject: |
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visualopsins wrote:
In the past, inexpensive adapters had thickness problems. Not so much now. Adapters are typical made slightly thinner than required, so lens will focus slightly past infinity. Too thick acts as extension tube, allowing only closer focus (same symptoms as here).
That's not much rotation -- the lens should focus close to infinity.
Does the lens focus ring only turn to 10 meters, as shown in photo? If yes, something is wrong with the lens. If it turns all the way to infinity and infinity focus is not reached, then adapter is too thick.
Let's see a photo with lens at infinity focus. My favorite subject is star field. Distant landscapes work too (with wide angle lens).
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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Lightshow
Joined: 04 Nov 2011
Posts: 3666
Location: Calgary
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| Posted: Wed Mar 20, 2013 6:11 pm Post subject: |
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Lightshow wrote:
Some M42 adapters are rotated slightly so the infinity mark is not obscured by the overhang on the crop cams, infinity should not be effected.
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kendo1
Joined: 07 Dec 2012
Posts: 171
Location: Edinburgh
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| Posted: Wed Mar 20, 2013 6:38 pm Post subject: |
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kendo1 wrote:
It looks like infinity would be in focus at f4, maybe close at 2.8.
Hyperfocal distance.
Only way is to take some pics. |
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luisalegria
Joined: 07 Mar 2008
Posts: 6602
Location: San Francisco, USA
Expire: 2018-01-18
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| Posted: Wed Mar 20, 2013 6:52 pm Post subject: |
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luisalegria wrote:
Its also possible that something in the adapter is preventing movement of the rear of the optical block.
This happens sometimes with adapters that are designed to press the M42 auto pin. They have a flange in the back of the mount to press the pin, and sometimes it is too wide.
If you take the lens+adapter off the camera, check the back to see if something is blocking the movement of the focus mechanism.
_________________
I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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VichySchwa
Joined: 08 Jan 2013
Posts: 32
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| Posted: Wed Mar 20, 2013 7:31 pm Post subject: |
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VichySchwa wrote:
(Edit) Luis added a good point... The adapter does *not* have a lip to press the pin. I use the preview button on the side as a workaround.
Test Shots taken at lunch, 1/800 at f/11, ISO 400, no corrections...
Reference pic via my EOS 22-55 zoom:
100% crop from the T4 28mm:
100% crop for the AF lens:
To my eye it looks a teeny bit off and may be more obvious (if the flare or fringing doesn't overwhelm) at more open stops... |
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visualopsins
Joined: 05 Mar 2009
Posts: 11053
Location: California
Expire: 2025-04-11
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| Posted: Wed Mar 20, 2013 8:14 pm Post subject: |
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visualopsins wrote:
Lower right side edge in first photo -- the chain-link in the gate -- looks more in-focus than the sign, i.e., front-focus...
Check T4 mount is properly attached, seated completely.
Adapter should be 45.46mm (M42) - 44mm (EOS) = 1.46mm thick. Have micrometer or calipers? Or another M42 lens, preferable wide-angle, to check infinity? The T4 lens could need focus adjustment...the "PASSED" sticker makes this unlikely...
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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VichySchwa
Joined: 08 Jan 2013
Posts: 32
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| Posted: Wed Mar 20, 2013 9:36 pm Post subject: |
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VichySchwa wrote:
| visualopsins wrote: |
| Lower right side edge in first photo -- the chain-link in the gate -- looks more in-focus than the sign, i.e., front-focus... |
D'oh! The first, uncropped photo is not of the T4 lens, it's of my AF lens that's a wide-normal zoom. Not a great lens quality-wise but I was not positioned parallel to the fence... I was pointing to the stop sign... But of course, not parallel to that either...  Which is why I chose f/11 instead of wide open...
| visualopsins wrote: |
Check T4 mount is properly attached, seated completely.
Adapter should be 45.46mm (M42) - 44mm (EOS) = 1.46mm thick. Have micrometer or calipers? Or another M42 lens, preferable wide-angle, to check infinity? The T4 lens could need focus adjustment...the "PASSED" sticker makes this unlikely... |
I have 2 other lenses I picked up recently-another T4 55-135 vivitar and a fixed mount M42 200mm vivitar... I'd have run those thru its paces and post when I have a chance... |
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killwilly
Joined: 16 May 2011
Posts: 111
Location: United Kingdom
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| Posted: Thu Mar 21, 2013 8:36 am Post subject: |
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killwilly wrote:
I have six M42 lenses and two adapters, one chipped and one unchipped, but I only have one lens that lines the red mark dead center of my 7D and that lens is my Zeiss Jenna 50mm f2.8. I had the same problem with my 450D. Both adapters have the flange to depress the pin
However, despite this alignment difference, all, but one will focus to, or even past infinity and that is my Vivitar 28mm. I just can not find how to adjust the infinity focus on that lens. 
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Alan. |
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TAo2
Joined: 09 Mar 2012
Posts: 319
Location: Scotland
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| Posted: Thu Mar 21, 2013 12:08 pm Post subject: |
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TAo2 wrote:
It really doesn't matter where the infinity marker ends up; as long as the lens still reaches infinity - two different cameras, four different lenses...
 
 
Assuming the lens reaches infinity without the adaptor, then it still should when attached tae it. If it doesn't then it's an adaptor problem.
ps does that adaptor have glass in it? |
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VichySchwa
Joined: 08 Jan 2013
Posts: 32
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| Posted: Thu Mar 21, 2013 4:55 pm Post subject: |
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VichySchwa wrote:
| TAo2 wrote: |
| It really doesn't matter where the infinity marker ends up; as long as the lens still reaches infinity - two different cameras, four different lenses... |
[pics snipped]
Those pics are helpful and clear up one part I wasn't clear on. Thanks!
| TAo2 wrote: |
Assuming the lens reaches infinity without the adaptor, then it still should when attached tae it. If it doesn't then it's an adaptor problem.
ps does that adaptor have glass in it? |
No glass...
I will post pics from my fixed 50 1.8 and the Vivitar 55-135 zoom as a second test-my next best approximation... I also will set the 50mm to infinity, not autofocus the subject--that may also have fudged the results above since I *did* autofocus the reference shot. Hope to do that after lunch... |
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VichySchwa
Joined: 08 Jan 2013
Posts: 32
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| Posted: Thu Mar 21, 2013 11:07 pm Post subject: |
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VichySchwa wrote:
Pics were taken a slightly different times of day, same subject as prior post. This time settings were 1/125, f/11, ISO 200, focus manually set to infinity. I am standing parallel to the orange sign and that is *supposed* to be the intended focus subject in this and the prior post's shots...
Reference Shot uncropped (I took shot from a farther away distance because the vivitar lens infinity is past 60 ft):
This is a 100% crop of shot taken on the Vivitar 55-135 zoom:
And this is a crop of the first shot, taken by the Canon AF 50mm 1.8:
More opinions/input welcome. Will have to see if I can get a caliper to measure the flange thickness of the adapter... |
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skut
Joined: 14 Dec 2012
Posts: 4
Location: Batangas
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| Posted: Fri Mar 22, 2013 5:49 am Post subject: |
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skut wrote:
this is what i do
Last edited by skut on Fri Mar 22, 2013 5:59 am; edited 1 time in total |
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calvin83
Joined: 12 Apr 2009
Posts: 7581
Location: Hong Kong
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| Posted: Fri Mar 22, 2013 5:55 am Post subject: |
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calvin83 wrote:
| skut wrote: |
this is what i do
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The best lens is the one you have with you.
https://lensfever.com/
https://www.instagram.com/_lens_fever/ |
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skut
Joined: 14 Dec 2012
Posts: 4
Location: Batangas
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| Posted: Fri Mar 22, 2013 6:03 am Post subject: |
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skut wrote:
thanks calvin |
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visualopsins
Joined: 05 Mar 2009
Posts: 11053
Location: California
Expire: 2025-04-11
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| Posted: Fri Mar 22, 2013 3:22 pm Post subject: |
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visualopsins wrote:
If infinity focus is being tested, why are we looking at closer subjects? IQ of closer subject with lens set at infinity cannot be compared to AF lens focused on closer subject. Also, the lenses should be tested with wide open apertures.
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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visualopsins
Joined: 05 Mar 2009
Posts: 11053
Location: California
Expire: 2025-04-11
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| Posted: Fri Mar 22, 2013 3:27 pm Post subject: |
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visualopsins wrote:
| skut wrote: |
| this is what i do |
Welcome skut!
Unfortunately that solution adds thickness to the adapter, moving infinity focus farther from reach...
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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skut
Joined: 14 Dec 2012
Posts: 4
Location: Batangas
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| Posted: Fri Mar 22, 2013 4:16 pm Post subject: |
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skut wrote:
| visualopsins wrote: |
| skut wrote: |
| this is what i do |
Welcome skut!
Unfortunately that solution adds thickness to the adapter, moving infinity focus farther from reach... |
no, i grind it a bit using my dremel tool. |
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VichySchwa
Joined: 08 Jan 2013
Posts: 32
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| Posted: Fri Mar 22, 2013 5:25 pm Post subject: |
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VichySchwa wrote:
| visualopsins wrote: |
| If infinity focus is being tested, why are we looking at closer subjects? IQ of closer subject with lens set at infinity cannot be compared to AF lens focused on closer subject. Also, the lenses should be tested with wide open apertures. |
Apologies for the flaws in my testing... I may have confused by using 2 different mf and af lenses, and on top of that confounding the testing with comparing to an autofocused subject, but my intention was to provide a reference shot and then crops of the shot viewed at 100%, concentrating on a specfic area of the shot.
In my original post of the picture of the lens on the adapter, the last distance marking on the lens is 30 ft/10m. In the first post that has pics from my 28mm I stood in the same location, more that 30 ft away from my intended subject (which incidentally is supposed to be the orange sign, not the stop sign) and took the same shots with the T4 and used the AF zoom as a comparison. I showed the full uncropped shot you would see at 28mm, then next pics were a crop of the area I was focusing on to compare whether or not the subject I was intending to focus on was actually in focus and sharp.
The rectangle in the pic above is the area of the crop. Along with using a wide open aperture please let me know what I may need to modify in testing for this to be correct, if I have any other correction to make. Thanks... |
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visualopsins
Joined: 05 Mar 2009
Posts: 11053
Location: California
Expire: 2025-04-11
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| Posted: Sat Mar 23, 2013 12:23 am Post subject: |
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visualopsins wrote:
Find subject at infinity to test infinity focus -- star field, moon, distant mountains...
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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dnas
Joined: 14 Nov 2008
Posts: 488
Location: Japan
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| Posted: Sat Mar 23, 2013 3:35 am Post subject: |
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dnas wrote:
As some others have said, your testing methodology is incorrect.
You need to test for two things:
1. If the adapter will EVER focus to infinity
2. If it focuses to infinity at the lens infinity mark
A. Leave the aperture wide open, otherwise the large DOF may mask any focus errors
B. Choose trees far away s you can examine the detail at 100% crop
C. Select the crop in the middle, not the side ike you did previously
D. Focus at the infinity mark on the lens. Then use live view or some other way to do an exact focus. See if it is still on the lens infnity mark |
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woodrim
Joined: 14 Jan 2010
Posts: 4060
Location: Charleston
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| Posted: Sat Mar 23, 2013 9:04 pm Post subject: |
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woodrim wrote:
The conclusion I have come to is that one never really knows if you reach infinity unless you go past it. Now that I have the NEX with the zoom focus aid, I can tell that on some lenses I go past infinity when before I thought it was correct. The difference can be very little. I'm also noticing that most of my lenses go past infinity with the NEX adapters and I wonder if it is intended to be that way. I prefer it.
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Regards,
Woodrim |
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