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Forum: Pentax Medium Format 01-28-2020, 02:45 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Good evening,

more than one year passed by until I found what I looked for - a solution fr a rigid mounting of the lens. Have a look to the fount solution using a ASI astronomy camera mounting ring. It works properly with an arca adapter on the tripods ball head. The Ring uses the P67-EOS-adapter on a diameter of 86mm. The ring bought at teleskop express webshop was manually manipulated to handle the release-knob of the P67 mount and the foam insinde was removed. The shade was a smaller one from Heliopan, inside covered with ultra black color by airbrush. Stray light sensitivity is reduced as I expected and the mech. dimensions are better to handle. The lens is large enough. Works with GFX50R via adapter as well. The camera attached here is "M" from Canon. All Adapters from K&F Concept or similar work as well, K-Mount, 645, GFX, EOS...

Jrg
Forum: Pentax Medium Format 01-23-2018, 12:16 AM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Hello Desertscape,

the mess with the missing tripod mount is the dominating problem I think, also as it intensifies the vibrations if you have the lens attached to the 67 without a point to stabilize the setup nearer to the front... - as I wrote I use it with a EOS 1Ds MkII - how the hell use the tripod mount of the adapter???

With a better hood contrast now is ok as I found, I'll try it with a polarizer the next days if the weather will be better as should be as the told in the tv. A rear filter would have been nice also with such a voluminous lens, but we have none.

The lens itself mechanically as Pentax produced it is very fine, the parallel developments of Pentacon and Zeiss Jena for the SIX are archaic in comparison with it. And even heavier, but with tripod mounts. The problems with contrast when the szene is not lighted exaktly from behind with the delivered hoods of the Pentacon 4.0/300 and the Sonnar 4.0/300 are the same, therefore I had the Heliopan-hood which is showed on the foto.

Concerning fringing - will test it stoppend down 1 or 1.5 stops next days at the night sky ...

Kind regards
Joerg
Forum: Pentax Medium Format 01-22-2018, 12:43 AM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Hi desertscape,

thank you for this information, as you see I start using the Pentax 67-System this days and the first impressions are very good, it is necessary to learn how to handle the massive lenses, but the results promise `more`.

Kind regards

Joerg
Forum: Pentax Medium Format 01-21-2018, 10:18 AM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Good evening all together,

last week I got a non-EDIF 300mm f4 in near mint condition for a minimal invest, so I thought it would be useful to test the adapter P67-EOS. The first tests with my EOS 1DS MkII were disappointing with low contrast. With my vintage lenses from Pentacon or Zeiss Jena often the too short lens hood causes those problems. So I tried to adapt a longer Heliopan hood:



{Inserting pictures via Flickr works :p:p:p}

This evening I tested a second time near the Loreley rock - now the images are easy to focus (with the split screen) and the colours are ok, sharpness was no problem neither with the short built-in hood nor with the Heliopan hood. The handling is ok with the camera attached, but a solution for the tripod is difficult. Mounting with the camera screw is nonsense, and the screw at the adapter is not much better. Focusing to infinity works properly.

Kind regards
Joerg
Forum: Pentax Medium Format 01-17-2018, 01:01 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Hello,

I could get a 400 4.0 EDIF for some days to test, the first experiences teached me to think about the mechanical tolerances of the tripod mount and the camera body.

The heavy weight of the lens and the orientation on the german mount seem to produce minimal moves of the combination. Fixing the lens only with the tripod mount is not sufficiant although the tripod mount seems to be very massive.

My idea is to use a vixen-style prism rail as a basis for fixing the lens with the tripod-screws and the camera body with a camera-holder. Focusing will be realized by a robofocus-motor and a belt-drive. If additional connecting of the camera body is not sufficient the last option is the tripod-mount of the P67 - EOS adapter, that is what the components offer ...

I will test and report.

Kind regards
Joerg
Forum: Pentax Medium Format 01-14-2018, 11:32 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Hello Ilya,

please use google and search for the keywords "widefield astrophotography", "pentax 67", "Pentax 67 400 4.0 ED IF". Fotos in use of the Takumar 400 were in a forum, I haven't marked it, I don't intend to have such a lens in the next future. You will find much interesting on narrowbandimaging.com and cloudynights.com. Those images are not mine so I will not distribute them.

Kind regards
Jrg
Forum: Pentax Medium Format 01-13-2018, 11:38 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Hello Desertscape,

what you wrote is also the essence of what I found in the web, the EDIF will perform wide open, I compare the "*"-Lenses of Pentax with the Canon's "L"-series, The Pentax lenses seem to be interesting for manual use on my EOS because of the easy adaption, good price and modern designs, in Germany we often look on our own vintage lens brands, but the prices for the commonly as good seen lenses are far from realism.

The 400 4.0 EDIF seems to have a very precise flat image-plane also, there exist CCD-Images with sensors much larger than 35mm with absolute fine stars to the edges and without any blur and fringing, so the invest in such a lens will have much potential for the future.

So far as seen in the www all of the EDIF's perform very well, so the 400 4.0 will be the first, bus perhaps not the last, we will see. This moment I observe some on EBay, the prices for a komplete package as deliveres are around 1.000 € + shipping, I try to keep patient and wait for the best offer. Fast buying is expensive buying on EBay.
Until having purchased a copy of the lens I optimize my german mount and autoguiding, enough to do. Some shorter lenses are here and also a EOS 20Da for testing, so the time will not become to long.

Kind regards
Joerg
Forum: Pentax Medium Format 01-11-2018, 01:09 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Good evening from Germany,

thank you to the community for the received information, akquisition of a copy is started, now I will see what is on the market here. Next job is the mounting of the lens on a telescope mount. Some ideas come from the links the forum delivered, others come from some publications of VdS in Germany. I will report what happens and how it looks like.

Kind regards
Joerg
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 01-09-2018, 01:26 PM  
Canon T50 - a Professional Camera?
Posted By optikus
Replies: 4
Views: 671
Hello,

T90 fullfills 90% of those things, F1n is able to perform, in a Colani-Housing. I have one and use it, with FD-Lenses and adaptable third-party-lenses, second FD-camera present is my T70, which can be seens as a successor of AE1 or A1, but the handling is in some aspekts very special. T50 is limited to Av-Operation so that it is not to consider as applicable for more then point and shoot action. All T's suffer from the problem to get them serviced if necessary, so they are to handle with care.

Kind regards
Joerg
Forum: Pentax Medium Format 01-08-2018, 12:46 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Wow ... ok, so I know the job to do ... - Luminous Landscape seems to be interesting. And the idea of the quality of the lens is confirmed as I think.

Thank you very much for the information.

Joerg
Forum: Pentax Medium Format 01-08-2018, 09:50 AM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Hi,

thanks a lot for the information, saw his images, impressing. It seems to be as suspekted, that the ED are really apochromatic. I found more users in the astro-scene who found some of the 67-lenses very capable, so I will see ...

Kind regards
Joerg
Forum: Pentax Medium Format 01-06-2018, 11:27 AM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 18
Views: 2,256
Hello,

I want to try the use of this lens with a astro-modified (enhanced red sensitivity) EOS 5D camera. Is there any experience concerning this lens for astrophotography here, especially its sensitivity for color fringing on the red and blue end of the spectrum?

Thank you for your replies.

Joerg
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