Lens wish list for Pentax 645

2351HD · 06-10-2016, 02:44 PM

I have been thinking about my ultimate landscape lens lineup for the Z, it is as follows:

DA 23mm f/5.6 (so as to be light)
DA 30mm f/4 Tilt Shift (could even just be tilt only)
DA 45mm f/2.8 OS (light and sharp by f/4 for walk around)
DA 90mm f/4.5 Tilt Shift
DA 45-90mm f/4.5 OS
DA 100-200mm f/4.5 OS
DA 300mm f/5.6 LS (maybe OS too, and needs a tripod foot rail solution that works with the Z)

Any or all could be DFA lenses if weight and size does not become to large. Focus must be on image quality not maximum aperture.

For travel handheld, I would take the 23, 45 and 100-200 OS, or substitute all 3 for just the 45-90mm for a one lens solution.

Now I just need a mirror less 645z with an EVF and EFC shutter, plus make it a little lighter. I understand some need or want an OVF but I don't. Give me these things before a 100mp sensor camera that doesn't have EFC and EVF etc. The 645z image quality is enough.

Cheers, Scott

Edit: added 45-90mm, don't know how I forgot it.

Last edited by 2351HD; 06-11-2016 at 11:35 AM.

Kolor-Pikker · 06-11-2016, 04:50 AM

I agree about the 45mm, the current 55mm I often find is not quite wide enough a lot of the time, but also not long enough other times, so something along the lines of a 45 + 75mm would be great.

Obviously, a new 45-80mm zoom would also scratch that itch, and if Pentax pulls the same magic as they did on the 28-45mm, I'd overlook an f/4.5 max aperture, but I really want them to go the extra mile and make some faster-than-2.8 lenses. Yes, the DoF will be thin, but as long as the parts that are in focus are razor sharp, it's all good.

OS (SR) should be a requirement on all lenses going forward, except for tilt-shifts. Without it, you need 2-3x the focal length value in shutter speed to get critically sharp images hand-held, and even on a tripod I like to keep it at 1x. Pushing for more pixels is not a realistic advancement for Pentax right now.

**iCrop** · 06-11-2016, 10:02 AM

Originally posted by Kolor-Pikker

OS (SR) should be a requirement on all lenses going forward,

Sorry, but I disagree on this point. Whatever you call it, OS or SR, it makes the lens too heavy. With the ISO performance of the 645Z, a shutter speed 2-3 times the focal length is quite practical. And I'd go for that DA 23mm (or anything in the 20-25mm range) in a heartbeat, if it were light and sharp.

2351HD · 06-11-2016, 11:33 AM

I like OS, but I can't help feel that it's not very good on Pentax MF. I always found that the OS on my DFA90 macro would blur images more than having it turned off. Same goes for the 28-45.

Yes I agree also, a new 45-90mm would be sweet, I will amend my list.

---------- Post added 06-12-16 at 04:36 AM ----------

Also, I would be happy if the wide angle TS lens was 35mm and not 30mm.

mikeSF · 06-11-2016, 12:59 PM

Agree. As a landscaper, I'm 100% shooting via tripod. OS would be turned off 100% of the time and wasted weight/bulk.

Having a portrait 645 solution with OS as in the current line up of course makes sense.

On the wide end, 23mm would not be wide enough for seascape work, IMO, I would want a slow ~18, 19, or 20mm prime probably.

2351HD · 06-11-2016, 01:12 PM - **1 Like**

Wow that's wide Mike, usually for me 18mm equivalent is enough, but of course a 20mm (15-16mm eq) is ok too.

It needs to take filters though.

mikeSF · 06-11-2016, 02:20 PM

Originally posted by 2351HD

Wow that's wide Mike, usually for me 18mm equivalent is enough, but of course a 20mm (15-16mm eq) is ok too.

It needs to take filters though.

fwiw, despite the calculated field of view, i find the D FA25 on the 645D/Z to be less wide than the DA15 on APS-C

Bob L · 06-11-2016, 02:36 PM

You can sign me up for a moderately wide tilt lens.

Whilst I prefer OVF's, I can also see the attraction of EVF's. There's no reason why the type of viewfinder should be mutually exclusive and a "swing over" EVF from the top of the pentaprism shouldn't be too much of an engineering and ergonomic challenge.

Bob

2351HD · 06-11-2016, 05:09 PM - **1 Like**

Originally posted by mikeSF

fwiw, despite the calculated field of view, i find the D FA25 on the 645D/Z to be less wide than the DA15 on APS-C

I think that has something to do with the aspect ratio of 4:3 to 3:2.

Royce Howland · 06-11-2016, 09:00 PM

I would likely purchase a 45mm tilt-shift, and would certainly purchase a 35mm tilt-shift. Both tilt and shift would be useful for my landscape and other outdoor work, and shift would be useful for perspective control with architecture work. Beyond that, I'm pretty happy with my current lenses. Or the potential of some that are available that I simply haven't acquired yet. Tilt-shift is what I miss the most from my old 35mm system; other things that would be nice to have are a distant second for me.

**Ed Hurst** · 06-12-2016, 04:04 AM - **1 Like**

I still want that 21mm f2.4 prime without OS

texandrews · 06-12-2016, 08:44 AM

For me it's a wide T/S (35 would be ok), and something like a 28 prime, and slow would be fine with both---should be optimized for sharpness, low distortion and flare control. A new 45 prime would also be quite nice, one that is better, and same considerations as above. Then of course a new LS lens, 75 or 55.

06-10-2016, 02:44 PM	#1
2351HD Veteran Member Join Date: Apr 2013 Location: Brisbane, Australia Photos: Albums Posts: 750	Lens wish list for Pentax 645 I have been thinking about my ultimate landscape lens lineup for the Z, it is as follows: DA 23mm f/5.6 (so as to be light) DA 30mm f/4 Tilt Shift (could even just be tilt only) DA 45mm f/2.8 OS (light and sharp by f/4 for walk around) DA 90mm f/4.5 Tilt Shift DA 45-90mm f/4.5 OS DA 100-200mm f/4.5 OS DA 300mm f/5.6 LS (maybe OS too, and needs a tripod foot rail solution that works with the Z) Any or all could be DFA lenses if weight and size does not become to large. Focus must be on image quality not maximum aperture. For travel handheld, I would take the 23, 45 and 100-200 OS, or substitute all 3 for just the 45-90mm for a one lens solution. Now I just need a mirror less 645z with an EVF and EFC shutter, plus make it a little lighter. I understand some need or want an OVF but I don't. Give me these things before a 100mp sensor camera that doesn't have EFC and EVF etc. The 645z image quality is enough. Cheers, Scott Edit: added 45-90mm, don't know how I forgot it. Last edited by 2351HD; 06-11-2016 at 11:35 AM.

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06-11-2016, 04:50 AM	#2
Kolor-Pikker Veteran Member Join Date: Dec 2014 Posts: 343	I agree about the 45mm, the current 55mm I often find is not quite wide enough a lot of the time, but also not long enough other times, so something along the lines of a 45 + 75mm would be great. Obviously, a new 45-80mm zoom would also scratch that itch, and if Pentax pulls the same magic as they did on the 28-45mm, I'd overlook an f/4.5 max aperture, but I really want them to go the extra mile and make some faster-than-2.8 lenses. Yes, the DoF will be thin, but as long as the parts that are in focus are razor sharp, it's all good. OS (SR) should be a requirement on all lenses going forward, except for tilt-shifts. Without it, you need 2-3x the focal length value in shutter speed to get critically sharp images hand-held, and even on a tripod I like to keep it at 1x. Pushing for more pixels is not a realistic advancement for Pentax right now.

06-11-2016, 10:02 AM	#3
iCrop Site Supporter Join Date: Mar 2007 Location: Tucson Photos: Gallery Posts: 292	Originally posted by Kolor-Pikker OS (SR) should be a requirement on all lenses going forward, Sorry, but I disagree on this point. Whatever you call it, OS or SR, it makes the lens too heavy. With the ISO performance of the 645Z, a shutter speed 2-3 times the focal length is quite practical. And I'd go for that DA 23mm (or anything in the 20-25mm range) in a heartbeat, if it were light and sharp.

06-11-2016, 11:33 AM	#4
2351HD Veteran Member Join Date: Apr 2013 Location: Brisbane, Australia Photos: Albums Posts: 750 Original Poster	I like OS, but I can't help feel that it's not very good on Pentax MF. I always found that the OS on my DFA90 macro would blur images more than having it turned off. Same goes for the 28-45. Yes I agree also, a new 45-90mm would be sweet, I will amend my list. ---------- Post added 06-12-16 at 04:36 AM ---------- Also, I would be happy if the wide angle TS lens was 35mm and not 30mm.

06-11-2016, 12:59 PM	#5
mikeSF Pentaxian Join Date: Jan 2009 Location: East Bay Area, CA Photos: Gallery Posts: 6,620	Agree. As a landscaper, I'm 100% shooting via tripod. OS would be turned off 100% of the time and wasted weight/bulk. Having a portrait 645 solution with OS as in the current line up of course makes sense. On the wide end, 23mm would not be wide enough for seascape work, IMO, I would want a slow ~18, 19, or 20mm prime probably.

06-11-2016, 01:12 PM - 1 Like	#6
2351HD Veteran Member Join Date: Apr 2013 Location: Brisbane, Australia Photos: Albums Posts: 750 Original Poster	Wow that's wide Mike, usually for me 18mm equivalent is enough, but of course a 20mm (15-16mm eq) is ok too. It needs to take filters though.

06-11-2016, 02:20 PM	#7
mikeSF Pentaxian Join Date: Jan 2009 Location: East Bay Area, CA Photos: Gallery Posts: 6,620	Originally posted by 2351HD Wow that's wide Mike, usually for me 18mm equivalent is enough, but of course a 20mm (15-16mm eq) is ok too. It needs to take filters though. fwiw, despite the calculated field of view, i find the D FA25 on the 645D/Z to be less wide than the DA15 on APS-C

06-11-2016, 02:36 PM	#8
Bob L Senior Member Join Date: Mar 2016 Location: La Vienne (86), France Posts: 223	You can sign me up for a moderately wide tilt lens. Whilst I prefer OVF's, I can also see the attraction of EVF's. There's no reason why the type of viewfinder should be mutually exclusive and a "swing over" EVF from the top of the pentaprism shouldn't be too much of an engineering and ergonomic challenge. Bob

06-11-2016, 05:09 PM - 1 Like	#9
2351HD Veteran Member Join Date: Apr 2013 Location: Brisbane, Australia Photos: Albums Posts: 750 Original Poster	Originally posted by mikeSF fwiw, despite the calculated field of view, i find the D FA25 on the 645D/Z to be less wide than the DA15 on APS-C I think that has something to do with the aspect ratio of 4:3 to 3:2.

06-11-2016, 09:00 PM	#10
Royce Howland Senior Member Join Date: Nov 2010 Location: Calgary, Alberta Posts: 275	I would likely purchase a 45mm tilt-shift, and would certainly purchase a 35mm tilt-shift. Both tilt and shift would be useful for my landscape and other outdoor work, and shift would be useful for perspective control with architecture work. Beyond that, I'm pretty happy with my current lenses. Or the potential of some that are available that I simply haven't acquired yet. Tilt-shift is what I miss the most from my old 35mm system; other things that would be nice to have are a distant second for me.

06-12-2016, 04:04 AM - 1 Like	#11
Ed Hurst Site Supporter Join Date: May 2010 Location: Sydney Posts: 1,657	I still want that 21mm f2.4 prime without OS

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06-12-2016, 08:44 AM	#12
texandrews Moderator Join Date: Apr 2014 Location: Baltimore Photos: Albums Posts: 3,390	For me it's a wide T/S (35 would be ok), and something like a 28 prime, and slow would be fine with both---should be optimized for sharpness, low distortion and flare control. A new 45 prime would also be quite nice, one that is better, and same considerations as above. Then of course a new LS lens, 75 or 55.