Is 645D compatible with Pentax 6x7 lenses ?

tuco · 03-17-2010, 07:56 AM

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Originally posted by bensonga

Maybe a RAID system with several terrabytes and a small Cray supercomputer to process the images.

Now if only the photos I made were worthy of such a setup.

Oh well, fun to dream of it anyways....

Gary

When I scan my 6x7 and 6x6 negatives at 4000dpi, I get over 10,000x8,000 and 8,000x8,000 pixel images. I've been handling it fine both in storage space and editing with an older PowerMac G5 (12GB ram) with not too much of a problem. But I must say I don't do too much editing with them at that size unless I have to. I first scale them down to a more manageable size if they are destine to be an online shot.

Similarly with that large of a digital camera file I'd suspect you'd be scaling them down too for editing unless you're going to be making a very large print.

Last edited by tuco; 03-17-2010 at 07:00 PM.

artemapei · 03-18-2010, 09:35 PM

Originally posted by bensonga

I know, I know.....I'm just thrilled to see the 645D come to life and will be even more thrilled on the day I can afford to buy one.....but I don't think I'll ever give up the dream of a digital P67. Can you imagine the IQ of a 6x7 sensor?!?! Maybe 60-80 megapixels......some of those big "fat pixels" (9 microns or more).

Gary

80Mp will be at 645 (41.5x56) in 3-4 years

so, 67 sensor (100Mp up at least) will be avail not earlier than in 10 years...

ogl · 03-28-2010, 05:35 AM

bensonga · 03-28-2010, 01:14 PM

Oh man....you're killing me with these photos! :-)

What's the story here? Where'd you get the pics etc? I don't see a P67=>645 adapter on there.

My 645NII arrived last week and I've been using some of my P67 lenses on it. I like those so much, I think I'm going to send the manual focus 645 lenses I purchased back to KEH. I'll just hold out until I can find some of the 645 FA lenses to go with it.

The 645D is moving to the top of my wish list, that's for sure!

Gary

Ramón · 03-28-2010, 01:26 PM

Originally posted by bensonga

Oh man....you're killing me with these photos! :-)

What's the story here? Where'd you get the pics etc? I don't see a P67=>645 adapter on there.

My 645NII arrived last week and I've been using some of my P67 lenses on it. I like those so much, I think I'm going to send the manual focus 645 lenses I purchased back to KEH. I'll just hold out until I can find some of the 645 FA lenses to go with it.

The 645D is moving to the top of my wish list, that's for sure!

Gary

Click on the photo, properties and voilà:

ŽÊ^‚ÅŒ©‚éƒyƒ“ƒ^ƒbƒNƒXu645DviƒÀ‹@j - ƒfƒWƒJƒWatch

A lot of Pentax 645D photos... and yes, there is the 6x7 to 645 adapter.

Ramón

bensonga · 03-28-2010, 02:20 PM

Thanks Ramon.....lots of great photos of the 645D there!

Gary

knumbnutz · 03-29-2010, 10:21 PM

WOW, i gonna have to get a bib if you keep posting those fotos...... major drool factor.
TFS
Cheers Neil

GeneV · 03-31-2010, 12:20 PM

Originally posted by tuco

When I scan my 6x7 and 6x6 negatives at 4000dpi, I get over 10,000x8,000 and 8,000x8,000 pixel images. I've been handling it fine both in storage space and editing with an older PowerMac G5 (12GB ram) with not too much of a problem. But I must say I don't do too much editing with them at that size unless I have to. I first scale them down to a more manageable size if they are destine to be an online shot.

Similarly with that large of a digital camera file I'd suspect you'd be scaling them down too for editing unless you're going to be making a very large print.

I do the same thing on an HP laptop with 3gb RAM. My uncropped 6x7 scans at 4000dpi are actually closer to 11,000 x 9000 pixels. It works, and you can even edit a 6x7, but it does chew on a 90-100mp image for a few seconds sometimes. It is much worse in color.

Smolk · 03-31-2010, 04:24 PM

Hi Tuco, which scanner do you use?

I've temporarily settled for an Epson 4490 - which will do for the moment. I'm scanning slides I took 10-17 years ago without ever seeing them (as I had no projector for the last 17 years... don't ask). I can see the difference between 35mm and 645 on the 4490, and can only imagine how 6x7 would look like. I'm wondering whether a good medium format scanner should not be on my wish list....

As for the 67D: would that not be overkill? If you can print 2 x 3 meter (meter!) from the 645D, what is there to be gained in a 67 format other than differences in noise etc which I suspect will be dealt with for the smaller sensors as time goes by?

tuco · 04-01-2010, 10:28 AM

Originally posted by Smolk

Hi Tuco, which scanner do you use?

I currently use a 4990 for my LF. Then I picked up a 9000ED for my MF. I saw an improvement in my 4990 scans when I finally purchased some scanning software instead of what it came with using multiple sample scans feature of the new software.

Phil1 · 04-11-2010, 02:43 AM

Just a heads up on a hard to find genuine Pentax 645 to 6x7 adapter:

Pentax MF Lens Adapter 645 to 67 6x4.5 6x7 67II 126151 - eBay (item 230458877300 end time Apr-14-10 11:57:19 PDT)

These should get expensive as the 645D starts to sell. Three days left from Sunday on bidding.

(No connection with the offer)

hsteeves · 04-11-2010, 06:20 AM

sorry, but that one has my name on it as I consider it to be my ticket to longer focal lengths ...

veraikon · 04-11-2010, 06:49 AM

IMHO ist that adapter still available through Pentax - so I doubt that the prices are rising

Smolk · 04-11-2010, 07:57 AM

Problem is, I only went for the 645 system because it is still reasonably light. That's not the case with the 67, me finks. Currently, I'm carrying the P645 with some lenses around with my MacBook so as to be able to use it whenever the occasion arises. Yet I noticed, it's much better without the laptop - every pound counts here. So using 67 lenses, while attractive indeed, seems to be self-defeating here unless one does studio work or take the car.

Ivan J. Eberle · 04-11-2010, 08:23 AM

Isn't the primary point to using a larger format that it's capable of outresolving the smaller format, not necessarily because lenses are superior (typically, there's an inverse relationship between image circle size and resolution) but due to the sheer amount of real estate covered by the format?

So can anyone tell me exactly which of the P67 lenses are such stellar performers that they're on equal footing with (or exceed the quality of) the equivalent P645 lenses-- when used on 645 format? Any of them?

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03-17-2010, 07:56 AM	#16
tuco Pentaxian Join Date: Jul 2009 Location: Pugetopolis Posts: 11,025	Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. Originally posted by bensonga Maybe a RAID system with several terrabytes and a small Cray supercomputer to process the images. Now if only the photos I made were worthy of such a setup. Oh well, fun to dream of it anyways.... Gary When I scan my 6x7 and 6x6 negatives at 4000dpi, I get over 10,000x8,000 and 8,000x8,000 pixel images. I've been handling it fine both in storage space and editing with an older PowerMac G5 (12GB ram) with not too much of a problem. But I must say I don't do too much editing with them at that size unless I have to. I first scale them down to a more manageable size if they are destine to be an online shot. Similarly with that large of a digital camera file I'd suspect you'd be scaling them down too for editing unless you're going to be making a very large print. Last edited by tuco; 03-17-2010 at 07:00 PM.

03-18-2010, 09:35 PM	#17
artemapei Forum Member Join Date: Nov 2009 Location: Moscow-Guangzhou Posts: 71	Originally posted by bensonga I know, I know.....I'm just thrilled to see the 645D come to life and will be even more thrilled on the day I can afford to buy one.....but I don't think I'll ever give up the dream of a digital P67. Can you imagine the IQ of a 6x7 sensor?!?! Maybe 60-80 megapixels......some of those big "fat pixels" (9 microns or more). Gary 80Mp will be at 645 (41.5x56) in 3-4 years so, 67 sensor (100Mp up at least) will be avail not earlier than in 10 years...

03-28-2010, 05:35 AM	#18
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382

03-28-2010, 01:14 PM	#19
bensonga Senior Member Join Date: Mar 2010 Location: Alaska Photos: Albums Posts: 149	Oh man....you're killing me with these photos! :-) What's the story here? Where'd you get the pics etc? I don't see a P67=>645 adapter on there. My 645NII arrived last week and I've been using some of my P67 lenses on it. I like those so much, I think I'm going to send the manual focus 645 lenses I purchased back to KEH. I'll just hold out until I can find some of the 645 FA lenses to go with it. The 645D is moving to the top of my wish list, that's for sure! Gary

03-28-2010, 01:26 PM	#20
Ramón New Member Join Date: Mar 2010 Location: Barcelona Posts: 21	Originally posted by bensonga Oh man....you're killing me with these photos! :-) What's the story here? Where'd you get the pics etc? I don't see a P67=>645 adapter on there. My 645NII arrived last week and I've been using some of my P67 lenses on it. I like those so much, I think I'm going to send the manual focus 645 lenses I purchased back to KEH. I'll just hold out until I can find some of the 645 FA lenses to go with it. The 645D is moving to the top of my wish list, that's for sure! Gary Click on the photo, properties and voilà: ŽÊ^‚ÅŒ©‚éƒyƒ“ƒ^ƒbƒNƒXu645DviƒÀ‹@j - ƒfƒWƒJƒWatch A lot of Pentax 645D photos... and yes, there is the 6x7 to 645 adapter. Ramón

03-28-2010, 02:20 PM	#21
bensonga Senior Member Join Date: Mar 2010 Location: Alaska Photos: Albums Posts: 149	Thanks Ramon.....lots of great photos of the 645D there! Gary

03-29-2010, 10:21 PM	#22
knumbnutz Veteran Member Join Date: Jul 2007 Location: Melbourne, Australia Photos: Gallery Posts: 394	WOW, i gonna have to get a bib if you keep posting those fotos...... major drool factor. TFS Cheers Neil

03-31-2010, 12:20 PM	#23
GeneV Veteran Member Join Date: Oct 2008 Location: Albuquerque NM Photos: Albums Posts: 9,830	Originally posted by tuco When I scan my 6x7 and 6x6 negatives at 4000dpi, I get over 10,000x8,000 and 8,000x8,000 pixel images. I've been handling it fine both in storage space and editing with an older PowerMac G5 (12GB ram) with not too much of a problem. But I must say I don't do too much editing with them at that size unless I have to. I first scale them down to a more manageable size if they are destine to be an online shot. Similarly with that large of a digital camera file I'd suspect you'd be scaling them down too for editing unless you're going to be making a very large print. I do the same thing on an HP laptop with 3gb RAM. My uncropped 6x7 scans at 4000dpi are actually closer to 11,000 x 9000 pixels. It works, and you can even edit a 6x7, but it does chew on a 90-100mp image for a few seconds sometimes. It is much worse in color.

03-31-2010, 04:24 PM	#24
Smolk Pentaxian Join Date: Feb 2010 Location: Eerbeek Photos: Gallery \| Albums Posts: 1,857	Hi Tuco, which scanner do you use? I've temporarily settled for an Epson 4490 - which will do for the moment. I'm scanning slides I took 10-17 years ago without ever seeing them (as I had no projector for the last 17 years... don't ask). I can see the difference between 35mm and 645 on the 4490, and can only imagine how 6x7 would look like. I'm wondering whether a good medium format scanner should not be on my wish list.... As for the 67D: would that not be overkill? If you can print 2 x 3 meter (meter!) from the 645D, what is there to be gained in a 67 format other than differences in noise etc which I suspect will be dealt with for the smaller sensors as time goes by?

04-01-2010, 10:28 AM	#25
tuco Pentaxian Join Date: Jul 2009 Location: Pugetopolis Posts: 11,025	Originally posted by Smolk Hi Tuco, which scanner do you use? I currently use a 4990 for my LF. Then I picked up a 9000ED for my MF. I saw an improvement in my 4990 scans when I finally purchased some scanning software instead of what it came with using multiple sample scans feature of the new software.

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04-11-2010, 02:43 AM	#26
Phil1 Inactive Account Join Date: Sep 2009 Location: SoCal Posts: 1,292	Just a heads up on a hard to find genuine Pentax 645 to 6x7 adapter: Pentax MF Lens Adapter 645 to 67 6x4.5 6x7 67II 126151 - eBay (item 230458877300 end time Apr-14-10 11:57:19 PDT) These should get expensive as the 645D starts to sell. Three days left from Sunday on bidding. (No connection with the offer)

04-11-2010, 06:20 AM	#27
hsteeves Senior Member Join Date: Feb 2010 Location: Saskatchewan Posts: 256	sorry, but that one has my name on it as I consider it to be my ticket to longer focal lengths ...

04-11-2010, 06:49 AM	#28
veraikon Senior Member Join Date: Mar 2010 Location: Inside the Blue Banana ;) Posts: 255	IMHO ist that adapter still available through Pentax - so I doubt that the prices are rising

04-11-2010, 07:57 AM	#29
Smolk Pentaxian Join Date: Feb 2010 Location: Eerbeek Photos: Gallery \| Albums Posts: 1,857	Problem is, I only went for the 645 system because it is still reasonably light. That's not the case with the 67, me finks. Currently, I'm carrying the P645 with some lenses around with my MacBook so as to be able to use it whenever the occasion arises. Yet I noticed, it's much better without the laptop - every pound counts here. So using 67 lenses, while attractive indeed, seems to be self-defeating here unless one does studio work or take the car.

04-11-2010, 08:23 AM	#30
Ivan J. Eberle Forum Member Join Date: Mar 2009 Location: Ventana Wilderness, CA Posts: 83	Isn't the primary point to using a larger format that it's capable of outresolving the smaller format, not necessarily because lenses are superior (typically, there's an inverse relationship between image circle size and resolution) but due to the sheer amount of real estate covered by the format? So can anyone tell me exactly which of the P67 lenses are such stellar performers that they're on equal footing with (or exceed the quality of) the equivalent P645 lenses-- when used on 645 format? Any of them?