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09-18-2012, 10:01 AM   #1
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Confirmed(?) that the new DA 560mm is a Petzal design

I read prior posts theorizing that the new DA560, being a "telescope design", might be a Petzal. The Photokina press kit includes a diagram of 6 elements in 3 groups. The front+middle doublets certainly look like a Petzval design. That would make the rear group a field flattener.

Seems similar in specs to the TeleVue np101 telescope (~$3900 for a 100mm wide f5.4 Petzval) then add a flattener (~$300) and autofocus. Given the $7000 price tag of the DA560, Pentax seems to value AF at nearly $3000. I hope Pentax customer support and build quality improves to TeleVue's level. Skywatcher had a 100m wide f5.0 Petzval in a catalog last year but I don't know if that scope ever reached market.




Last edited by DeadJohn; 09-18-2012 at 10:02 AM. Reason: Image link
09-18-2012, 10:21 AM   #2
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Keep in mind though that Pentax has a tendency to really jack up the prices at first and then have rebates and slowly lower the price. This seems to be a trend
09-18-2012, 10:25 AM   #3
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Don't forget the drop-in filter....
09-18-2012, 10:26 AM   #4
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And weather resistance~

09-18-2012, 10:27 AM   #5
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QuoteOriginally posted by DeadJohn Quote
I read prior posts theorizing that the new DA560, being a "telescope design", might be a Petzal. The Photokina press kit includes a diagram of 6 elements in 3 groups. The front+middle doublets certainly look like a Petzval design. That would make the rear group a field flattener.

Seems similar in specs to the TeleVue np101 telescope (~$3900 for a 100mm wide f5.4 Petzval) then add a flattener (~$300) and autofocus. Given the $7000 price tag of the DA560, Pentax seems to value AF at nearly $3000. I hope Pentax customer support and build quality improves to TeleVue's level. Skywatcher had a 100m wide f5.0 Petzval in a catalog last year but I don't know if that scope ever reached market.
Good info. Thanks. But that $3990 for the TeleVue np101 is street price. (For example, $3995 at B&H Photo.) I am quite confident that the DA560 will be available for quite a bit less than $7000, at least from some retailers for some period of time. With Pentax and their crazy pricing schemes you have to time your purchases carefully.

With or without MAP, I always seem to be able to get Pentax lenses for far less than suggested retail price.

Dan
09-18-2012, 10:30 AM   #6
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The Sigma 500/4.5 has a retail price of $6000 but the street price is $4999.
09-18-2012, 10:38 AM   #7
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Dedicated lens mount and not having to fiddle with adapters, as well as, in camera control of lens and auto camera modes functioning correctly. Following a BIF and not having to worry about green button metering is valuable.
09-18-2012, 10:46 AM   #8
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also, HD lens coating. I'm not sure how advanced the Televue scope coatings are compared to HD though.

09-18-2012, 10:54 AM   #9
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I completely forgot adjustable aperture, too. We don't always want to be forced to shoot wide open.
09-18-2012, 10:54 AM   #10
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Folks used to complain about Pentax AF and no long glass for wildlife. Now they have both of those items. It'll be interesting to see how good the IQ is with this lens.
09-18-2012, 10:56 AM - 1 Like   #11
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QuoteOriginally posted by ironlionzion Quote
also, HD lens coating. I'm not sure how advanced the Televue scope coatings are compared to HD though.
Good telescope lens coatings are on par with good camera lens coatings.
09-18-2012, 10:57 AM   #12
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Although admittedly, we did get side tracked. I guess it'd be nice to hear if it really is confirmed to be the Petzal design.

Are they good telescopes (<-serious question )?
09-18-2012, 02:22 PM   #13
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@JinDesu, Yes, Petzval is a good telescope design. It uses 2 doublets (4 total elements) that correct color fringing in each other. The DA560 rear group is a field flattener, so the image circle focuses evenly across the entire sensor.

Performance-wise, Petzval and the more common 3-elements-in-1-group apochromatic triplet design can both have excellent performance. I've never heard any major complaints regarding either design. TeleVue, Takahashi, and Borg, respected telescope manufacturers, include Petzvals in their product offerings. Stellarvue and Astro-Physics, equally respectable companies, use 3-element apochromats and no Petzvals.

I think Petzval lends itself towards faster scopes. 3-element apochromats are generally f6 - f7 or slower. The DA560 and Petzval telescopes come in around f5.
09-18-2012, 08:14 PM   #14
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SDM is worth $3000..... So they want us to assume
09-18-2012, 09:23 PM   #15
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Waiting to see sample shots from this lens then will decide on getting one...

Hopefully the AF in the K5II/s has improved significantly as well...

As for the design i don't know anything about it, rather concentrate on trying to take nice pictures from whatever is offered.
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