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Author Topic: Recent return to the P25+. Not an amateur but HELP NEEDED  (Read 11712 times)

ASSEMBLY

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #20 on: January 23, 2015, 06:18:34 am »

Ben,  the image circle on most V lenses is sufficient?  Sounds amazing!  How does it compare to Rodey/Schneider glass?  Can the layman/woman tell the difference?

Chris Livsey

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #21 on: January 23, 2015, 06:47:43 am »

Sean with a WRS you can use this:
http://www.ebay.ch/itm/Cambo-WDS-WRS-Lens-board-fit-hasselblad-lens-phase-one-leaf-digital-back-/171643633696?pt=LH_DefaultDomain_0&hash=item27f6c20020
I bought it two years ago from the same seller and after a small modification I can shift all my V lenses up to 12 mm.
The CFE 40 IF is now a very important lens for my interior photos.

Ben

Ben, small modification? Care to elucidate?

CFE 40 IF shift is given as 1mm here : http://harrysproshop.com/Hasselblad_Flex/hasselblad_flex.html
Is the shift related to the digital back crop as I presume the quotes are for full frame  6x6?

In what way is this set up superior to the flex adapter?

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ben730

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #22 on: January 23, 2015, 06:59:24 am »

Use F11 and everything is perfect up to 12mm shift. With the P40+ you can shift more but corner sharpness
gets worse, but normally I don't need corner sharpness in skys and ceilings and floors..........
With the P25+ you will be happy.
There are some very good V lenses as the 40 CFE IF, the 100, the 120 and I love also the 80 CFE and the 150 CFI.
My Rodeys/Schneiders have larger image circles but in the center (+ - 5mm shift) they are not visibly sharper.
But this should be discussed by pixel peepers, I only have to earn money with these lenses.....

ben730

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #23 on: January 23, 2015, 07:28:43 am »

Chris
I think this 1 mm is for 6x6.
I prefer this setup because I can horizontal + vertical shift at the same time and the Flex adapter can't take Rodeys/Schneiders.
The Flexbody also can tilt, this makes it less stable. Sometimes very small displacement destroys an image......
By the way, I still have a Flexbody in good condition to sell...

The small modification was to cut off some metal that diminished the image circle to 9mm and paint this parts black. When I look at the pictures on eBay
I see that this problem is solved now. With this peace you may have more than 12mm shift.
 


Chris Livsey

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #24 on: January 23, 2015, 08:05:09 am »

Chris
I think this 1 mm is for 6x6.

I agree, reply appreciated, an attractive  option, I've not had hands on the flex body so as always user comments are more pertinent than the blurb!!
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ASSEMBLY

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #25 on: January 23, 2015, 08:46:59 am »

Ben, that's some great information.  Thanks for sharing.

Any experience in using CF lenses with similar results.  In other words are CFE lenses a must?

ben730

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #26 on: January 23, 2015, 09:58:01 am »

" In other words are CFE lenses a must? "

Sean
I don't think. I prefer the focusing ring and the cable lock on the CFEs.
Maybe they are more straylight resistant.
I use the CF 120, CF 100 and the CF 60.
The only must is the CFE 40 IF. This lens is a class of it's own.


Chris Livsey

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #27 on: January 23, 2015, 12:18:19 pm »

" In other words are CFE lenses a must? "

Sean
I don't think. I prefer the focusing ring and the cable lock on the CFEs.

The CFi range has the pc cable lock as well FYI.
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ASSEMBLY

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #28 on: January 24, 2015, 08:14:30 am »

Chris, 

Not sure that you've mentioned your complete setup (ie back used and crop factor) but curious as to what the field of view is with the 40 CFE IF.  One shot, no stitching.  Vertical, horizontal.  Also, what's it roughly like in 35mm terms?

Doug Peterson

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #29 on: January 24, 2015, 09:05:15 am »

Chris, 

Not sure that you've mentioned your complete setup (ie back used and crop factor) but curious as to what the field of view is with the 40 CFE IF.  One shot, no stitching.  Vertical, horizontal.  Also, what's it roughly like in 35mm terms?


The second tool here will show you the comparative angle of view between nearly all photo formats, allowing comparison by vertical, horizontal, diagonal, absolute focal length, and allows stitching:
https://digitaltransitions.com/page/tech-camera-visualizers

ASSEMBLY

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #30 on: January 24, 2015, 10:21:02 am »

Wow! That's some impressive HTML, Doug.  Thanks for the link.

I promise I'll get back to Jeff this weekend - a bit of a crazy week.

Chris Livsey

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #31 on: January 24, 2015, 11:56:37 am »

Chris, 

Not sure that you've mentioned your complete setup (ie back used and crop factor) but curious as to what the field of view is with the 40 CFE IF.  One shot, no stitching.  Vertical, horizontal.  Also, what's it roughly like in 35mm terms?


Setup is 501c/m with Phase One P20 back (square sensor)
The sensor is 36.9mm square so diagonal is 52.1845mm
The frame is 6x6 which in real life is 56mm square so 79.196mm diagonal.
That gives a crop factor of 1.52 (1.5 is always quoted!!)


The diagonal angle of view of a 40mm lens on the 6x6 frame is 88 degrees so that cropped gives 60 degrees which is equivalent to using a 60mm lens on 6x6 full frame.
In 35mm terms a 60 degree angle of view diagonal is given by a 35mm lens (rounding figures to nearest equivalents).

Hope that is clear  :)


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Doug Peterson

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #32 on: January 24, 2015, 11:57:42 am »

Wow! That's some impressive HTML, Doug.  Thanks for the link.

Thanks. I had a lot of fun learning Raphael JS to make it. It was still a ton of work, but SO much less work than trying to code it from scratch.

I promise I'll get back to Jeff this weekend - a bit of a crazy week.

No rush on our end. We're glad to help when you're ready :).

ASSEMBLY

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #33 on: January 25, 2015, 08:37:55 am »

Chris,

Thank you, that is clear and helpful. Would you mind sharing an image taken with that setup?  Preferably a tight interior shot.

Much appreciated.

ASSEMBLY

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #34 on: January 26, 2015, 02:32:19 pm »

So prior to starting this thread, I found and purchased a 40mm CF for a reasonable price on eBay.  Just arrived and it seems pretty serviceable.

I know you recommend the CFE IF, but wondering if this CF copy has the same image circle.  Anyone know?  I dont have a Cambo YET to try it out but curious if I should just send it back or keep it.

thx.

ben730

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #35 on: January 26, 2015, 04:11:21 pm »

I know you recommend the CFE IF, but wondering if this CF copy has the same image circle.  Anyone know?  I dont have a Cambo YET to try it out but curious if I should just send it back or keep it.

Sorry, I can't remember the image circle, but mine (CF FLE) was nowhere sharp enough and was weak in backlight situations.
The IF is something else. It's also strong on the D800 with a Mirex shift adapter, stronger than my Nikkor 45 PC.
Only problem is it's weight and it's price.....
Ben

Chris Livsey

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #36 on: January 27, 2015, 12:22:36 pm »

Chris,
Thank you, that is clear and helpful. Would you mind sharing an image taken with that setup?  Preferably a tight interior shot.
Much appreciated.

You can't get tighter than this en-suite  ;) Not dressed!! Mixed light, came in at 3167 -0.5, and yes the sensor needs a clean. Levelled off on tripod. The triangle of light LHS of the radiator is daylight from the skylight. Profile is P20 flash, standard film curve.

@f8, focus on radiator, 50 iso, about 3 secs ( I was counting! ) C1v7 Happy to send the RAW if mail will take it 18MB.


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ASSEMBLY

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #37 on: January 27, 2015, 09:33:38 pm »

Chris,

Thank you greatly for taking the time to explain and post that image.  At the moment I dont believe I need the RAW file.

Trying to put this to bed....

My last question is re: H lenses.  Does anyone have similar experience in using a tech camera with the wider H lenses?  I'm assuming the H mount is backwards compatible with the V bodies? Are they similarly sharp?  If I'm throwing ~$5k at the 40mm CFE IF, should I just get a similarly wide H lens?  I could benefit from a wide +movements lens and keep my H2 body (with autofocus) for other work.  Questions are whether the 28mm or 35mm have similar image circles, and if they're as sharp.

I may have jumbled H and V in that paragraph, let me know if I'm hard to follow.

Thanks in advance. 
« Last Edit: January 27, 2015, 10:11:23 pm by SeanKarns »
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ASSEMBLY

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #38 on: January 27, 2015, 10:10:50 pm »

BTW. I appreciate your putting up an un-edited photo for review.  Most (self-conscious photogs) would post a final photo, but its what's in the actual RAW image that truly counts.  Cheers.

Chris Livsey

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Re: Recent return to the P25+. Not an amateur but HELP NEEDED
« Reply #39 on: January 28, 2015, 02:45:18 am »


Trying to put this to bed....

  I'm assuming the H mount is backwards compatible with the V bodies? Are they similarly sharp? 

Thanks in advance. 

I think you jumbled. The older V glass can be mounted on the H body with the adapter, mine is at Hasselblad for service, it works well for static work. The H lenses cannot go on the V body. There is a longish article from Hasselblad showing the H glass is "better" MTF wise than the older V. This was they switched from Zeiss to Fuji and there were concerns, understandably, from those using Zeiss since day one.
http://www.hasselblad.co.uk/media/1663143/the_evolution_of_lenses.pdf

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