Hello giodic & All,
I concur with much of what has been said about "comparing apples to apples" in the sense that f/30 and f/24 are different enough that one should use "the same" barlow with both sides of the comparison: I would use a barlow 4.0x "telecentric" to make the closest approach to the native 4.2 or 4.3 internal to the Quark unit. The "best" approach would have two ERFs and Two "Identical" OTAs mounted on the same Mount, but who has all that ?
On another note, The Quark actual oven operation can be "augmented" with a simple meter system. I use a Drok USB Voltage and Current meter inline with the USB "A" port on a USB "A" to USB "Micro" cable. I use an external USB "A" Battery that provides many hours of operation and can supply more than the minimum current to power the Quark (about 1.25 A at 5.1x Volts are "typical" with my several Quarks). With this metered approach, I can monitor and see the oven cycle "on-and-off" and "back off from the full-on" as needed. I have standardized my approach using the meter to show me what power is being drawn at any given moment. I find that this "metered" approach appeals to me as an Engineering Scientist. I don't need to see the actual wattage, but can just pay attention to the Amps drawn, since the Voltage available from my "BIG ENOUGH" battery remains almost constant.
The Quark uses a PIC Micro-Controller to estimate the PID settings needed to control the "Oven" that "tunes" the Quark. I find that I can keep a close eye on just the current and know all I want to know about the Quark's heating (or Cooling = lack of heating) in a glance.
Perhaps this helps some of you Quark owners ? (My meter was about $10 USD on Amazon).
Ed (aka eblanken) Blankenship
Edited by eblanken, 26 June 2022 - 05:11 PM.